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1 features 3.3 volt supply 5v tolerant inputs and ttl compatible outputs. 256 x 256 or 512 x 256 switching con?urations 8-bit or 4-bit channel switching capability guarantees frame integrity for wideband channels automatic identi?ation of st-bus/gci interfaces accepts serial streams with data rates of 2.048, 4.096 or 8.192 mb/s rate conversion from 2.048 mb/s to 4.096 or 8.192 mb/s and vice-versa programmable frame offset on inputs per-channel three-state control per-channel message mode control interface compatible to intel/motorola cpus low power consumption applications medium size mixed voice and data switching/ processing matrices hyperchannel switching (e.g., isdn h0) mvip interface functions serial bus control and monitoring centralized voice processing systems voice/data multiplexer adpcm 32 kbit/s channel switching description the 3.3v multiple rate digital switch (MT89L86) is pin compatible with zarlinks 5v mt8986 and retains all of its functionality. this 3.3v device is designed to provide simultaneous non-blocking connections for up to 256 64kb/s channels or blocking connections for up to 512 64kb/s channels. the serial inputs and outputs may have 32 to 128 64kb/s channels per frame with data rates ranging from 2048 up to 8192 kb/s. it also provides per-channel selection between variable and constant throughput delays allowing voice and grouped data channels to be switched without corrupting the data sequence integrity. figure 1 - functional block diagram sti0 sti1 sti2 sti3 sti4 sti5 sti6 sti7 sti8 sti9 sti10 sti11 sti12 sti13 sti14 sti15 sto0 sto1 sto2 sto3 sto4 sto5 sto6 sto7 sto8 sto9 clk fr as/ ale im ds r d c s r/w w r a0/ a7 d t a ad7/ ad0 csto v dd v ss ode serial to parallel converter multiple buffer data memory output mux parallel to serial converter timing unit internal registers microprocessor interface connection memory reset ** for 48-pin ssop only ** ds5195 issue 2 september 1999 MT89L86 multiple rate digital switch cmos st-bus ? family ordering information MT89L86ap 44 pin plcc MT89L86an 48 pin ssop -40 c to +85 c advance information
MT89L86 advance information 2 figure 2 - pin connections pin description pin # name description 44 plcc 48 ssop 22 dt a data acknowledgment (open drain output) . this active low output indicates that a data bus transfer is complete. a pull-up resistor is required at this output. 3-5 7-9 3-5 7-9 sti0-5 st-bus inputs 0 to 5 (5v-tolerant inputs). serial data input streams. these streams may have data rates of 2.048, 4.096 or 8.192 mbit/s with 32, 64 or 128 channels, respectively. 10 10 sti6/a6 st-bus input 6/addr.6 input (5v-tolerant input). the function of this pin is determined by the switching con?uration enabled. if non-multiplexed cpu bus is used along with a higher input rate of 8.192 or 4.096 mb/s, this pin provides a6 address input function. for 2.048 and 4.096 mb/s (8x4) applications or when the multiplexed cpu bus interface is selected, this pin assumes sti6 function. see control register bits description and tables 1, 2, 6 & 7 for more details. note that for applications where both a6 and sti6 inputs are required simultaneously (e.g., 8 x 4 switching con?uration at 4.096 mb/s or rate conversion between 2.048mb/ s to 4.196 or 8.192 mb/s) the a6 input should be connected to pin sto6/a6. 11 11 sti7/a7 st-bus input 7/addr.7 input (5v-tolerant input): the function of this pin is determined by the switching con?uration enabled. if non-multiplexed cpu bus is used along with a higher input rate of 8.192 mb/s, this pin provides a7 address input function. for 2.048 and 4.096 mb/s (8x4) applications or when the multiplexed cpu bus is selected, this pin assumes sti7 function. see control register bits description and tables 1, 2, 6 & 7 for more details. note that for applications where both a7 and sti7 inputs are required simultaneously (e.g., 2.048 to 8.192 mb/s rate conversion) the a7 input should be connected to pin sto7/a7. 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 1 48 pin ssop 47 46 45 44 43 42 41 40 39 38 37 36 35 34 33 32 31 30 29 28 ode sto0 sto1 sto2 sti14/sto8 sto3 sto4 sto5 sto6/a6 sto7/a7 v ss v dd ad0 ad1 ad2 ad3 ad4 sti15/sto9 ad5 ad6 d t a sti0 sti1 sti2 as/ale sti3 sti4 sti5 sti6/a6 sti7/a7 v dd r e s e t fr clk sti8/a0 sti9/a1 sti10/a2 im sti11/a3 sti12/a4 1 65432 44434241 40 7 8 9 10 11 12 13 14 15 16 39 38 37 36 35 34 33 32 31 30 23 18 19 20 21 22 24 25 26 27 28 17 29 d t a sti0 sti1 sti2 as/ale ode sto0 sto1 sto2 sti14/sto8 sto3 sto4 sto5 sto6/a6 sto7/a7 v ss ad0 ad1 ad2 ad3 ad4 im sti11/a3 sti12/a4 sti13/a5 ds/r d sti15/sto9 ad5 ad6 ad7 c s r/w / w r csto sti3 sti4 sti5 sti6/a6 sti7/a7 v dd fr clk sti8/a0 sti9/a1 sti10/a2 44 pin plcc 48 csto v ss 21 27 ad7 sti13/a5 22 26 cs ds/rd 23 25 v ss r/w \wr 24 (jedec mo-118, 300mil wide)
advance information MT89L86 3 12 12,36 v dd +3.3 volt power supply . 13 reset device reset ( 5v-tolerant input). this pin is only available for the 48-pin ssop package. in normal operation, this active low input puts the MT89L86 in its reset state. it clears the internal counters and registers. all st-bus outputs are set to the high impedance state. the reset pin must be held low for a minimum of 100nsec to reset the device. 13 14 fr frame pulse (5v-tolerant input). this input accepts and automatically identi?s frame synchronization signals formatted according to st-bus and gci interface speci?ations. 14 15 clk clock (5v-tolerant input). serial clock for shifting data in/out on the serial streams. depending on the serial interface speed selected by ims (interface mode select) register, the clock at this pin can be 4.096 or 8.192 mhz. 15-17 16-18 sti8/a0, sti9/a1, sti10/a2 address 0-2 / input streams 8-10 (5v-tolerant input). when the non-multiplexed cpu bus is selected, these lines provide the a0-a2 address lines to the MT89L86 internal registers. when the 16x8 switching con?uration is selected, these pins are st-bus serial inputs 8 to 10 receiving data at 2.048 mb/s. 19-21 20-22 sti11/a3, sti12/a4, sti13/a5 address 3-5 / input streams 11-13 (5v-tolerant input). when the non-multiplexed cpu bus is selected, these lines provide the a3-a5 address lines to the MT89L86 internal registers. when the 16x8 switching con?uration is selected, these pins are st-bus serial inputs 11 to 13 receiving data at 2.048 mb/s. 22 23 ds/rd data strobe/read (5v-tolerant input). when the non-multiplexed cpu bus or motorola multiplexed bus is selected, this input is ds. this active high input works in conjunction with cs to enable read and write operation. for the intel/national multiplexed bus interface, this input is rd . this active low input con?ures the data bus lines (ad0-7) as outputs. 23 24 r/w \wr read/write \ write (5v-tolerant input). for the non-multiplexed or motorola multiplexed bus interface, this input is r/w . this input controls the direction of the data bus lines (ad0-ad7) during a microprocessor access. for the intel/national multiplexed bus interface, this input is wr . this active low signal con?ures the data bus lines (ad0-7) as inputs. 24 26 cs chip select (5v-tolerant input). this active low input enables a microprocessor read or write of the MT89L86s internal control register or memories. 25-27 29-33 27-29 31-35 ad7-ad0 data bus (bidirectional): these pins provide microprocessor access to the internal control registers, connection memories high and low and data memories. for the multiplexed bus interface these pins also provide the input address to the internal address latch circuit. 34 1, 25,37 v ss ground . 35 38 sto7/a7 st-bus output 7/address 7 input (three-state output/input). the function of this pin is determined by the switching con?uration enabled. if non-multiplexed cpu bus is used along with data rates employing 8.192 mb/s rates, this pin provides a7 address input function. for 2.048 mb/s applications or when the multiplexed cpu bus interface is selected, this pin assumes sto7 function. see tables 1, 2, 6 & 7 for more details. note that for applications where a7 input and sto7 output are required simultaneously (e.g., 8.192 to 2.048 mb/s rate conversion), the a7 input should be connected to pin sti7/a7. pin description (continued) pin # name description 44 plcc 48 ssop
MT89L86 advance information 4 36 39 sto6/a6 st-bus output 6/address 6 input (three-state output/input) . the function of this pin is determined by the switching con?uration enabled. if non-multiplexed cpu bus is used along with a higher data rate employing 8.192 or 4.096 mb/s, this pin provides the a6 address input function. for 2.048 mb/s applications or when the multiplexed cpu bus interface is selected, this pin assumes sto6 function. see tables 1, 2, 6 & 7 for more details. note that for applications where both a6 input and sto6 output are required simultaneously (e.g., 4.096 to 2.048 mb/s or 8.192 to 2.048 mb/s rate conversion applications), the a6 input should be connected to pin sti6/a6. 37-39 41-43 40-42 44-46 sto5-0 st-bus outputs 5 to 0 (three-state outputs) . serial data output streams. these serial streams may be composed of 32, 64 and 128 channels at data rates of 2.048, 4.096 or 8.192 mbit/s, respectively. 44 47 ode output drive enable (5v-tolerant input) . this is the output enable input for the sto0 to sto9 serial outputs. if this input is low sto0-9 are high impedance. if this input is high each channel may still be set to high impedance by using per-channel control bits in connect memory high. 1 48 csto control st-bus output (output) . this is a 2.048 mb/s output containing 256 bits per frame. the level of each bit is determined by the csto bit in the connect memory high locations. 6 6 as/ale address strobe or latch enable (5v-tolerant input) . this input is only used if multiplexed bus is selected via the im input pin. the falling edge of this signal is used to sample the address into the address latch circuit. when the non-multiplexed bus interface is selected, this input is not required and should be connected to ground. 18 19 im cpu interface mode (5v-tolerant input). if high, this input con?ures the MT89L86 in the multiplexed microprocessor bus mode. when this input pin is connected to ground, the MT89L86 assumes non-multiplexed cpu interface. 28 30 sti15/ sto9 st-bus input 15 / st-bus output 9 ( input/three-state output) . this pin is only used if multiplexed cpu bus is selected. if 16-input x 8-output switching con?uration is enabled in the scb bits (ims register), this pin is an input receiving serial st-bus stream 15 at a data rate of 2.048 mbit/s. if stream pair selection capability is enabled (see switching con?uration section), this pin is the st-bus stream 9 output. when non-multiplexed bus structure is used, this pin should be connected to ground. 40 43 sti14/ sto8 st-bus input 14 / st-bus output 8 (input/three-state output) . this pin is only used if multiplexed cpu bus is selected. if 16-input x 8-output switching con?uration is enabled in the scb bits (ims register), this pin is an input that receives serial st-bus stream 14 at a data rate of 2.048 mbit/s. if stream pair selection capability is enabled (see switching con?uration section), this pin is the st-bus stream 8 output. when non-multiplexed bus structure is used, this pin should be connected to ground. pin description (continued) pin # name description 44 plcc 48 ssop
advance information MT89L86 5 device overview with the integration of voice, video and data services in the same network, there has been an increasing demand for systems which ensure that data at n x 64 kb/s rates maintain sequence integrity while being transported through time-slot interchange circuits. this requirement demands time-slot interchange devices which perform switching with constant throughput delay for wideband data applications while maintaining minimum delay for voice channels. the MT89L86 device meets the above requirement and allows existing systems based on the mt8980d to be easily upgraded to maintain the data integrity when wideband data is transported. the device is designed to switch 32, 64 or n x 64 bit/s data. this MT89L86 can provide frame integrity for data applications and minimum throughput switching delay for voice applications on a per channel basis. the serial streams of the MT89L86 can operate at 2.048, 4.096 or 8.192 mbit/s and are arranged in 125 s wide frames which contain 32, 64 and 128 channels, respectively. in addition, a built-in rate conversion circuit allows the user to interconnect various backbone speeds like 2.048 or 4.096 or 8.192 mb/s while maintaining the control of throughput delay function on a per-channel basis. by using zarlink message mode capability, the microprocessor can access input and output time- slots on a per channel basis to control external circuits or other st-bus devices. this MT89L86 automatically identi?s the polarity of the frame synchronization input signal and con?ures its serial port to be compatible to both st-bus and gci formats. two different microprocessor bus interfaces can be selected through an input mode pin (im): non- multiplexed or multiplexed. these interfaces provide compatibility with intel/national multiplexed and motorola multiplexed/non-multiplexed buses. the MT89L86 provides a 16 x 8 switching con?uration to form a 512 x 256 channel blocking matrix. also, a ?xible stream pair selection operation allows the software selection of which pair of input and output streams can be connected to an internal 128 x 128 matrix. see switching con?urations section for details. functional description a functional block diagram of the 3.3v MT89L86 is shown in figure 1. depending on the application, tdm serial data can be received at different rates and from different number of serial streams. data and connect memories for all data rates, the received serial data is converted to parallel format by the serial to parallel converters and stored sequentially in a data memory. depending on the selected operation programmed in the ims (interface mode select) register, the data memory may have up to 512 bytes in use. the sequential addressing of the data memory is performed by an internal counter which is reset by the input 8 khz frame pulse (fr) marking the frame boundaries of the incoming serial data streams. data to be output on the serial streams may come from two sources: data memory or connect memory. locations in the connect memory, which is split into high and low parts, are associated with particular st-bus output streams. when a channel is due to be transmitted on an st-bus output, the data for the channel can either be switched from an st-bus input as in connection mode or it can be from the connect memory low as in message mode. data destined for a particular channel on the serial output stream is read from the data memory or connect memory low during the previous channel time-slot. this allows enough time for memory access and parallel to serial conversion. connection and message modes in the connection mode, the addresses of the input source data for all output channels are stored in the connect memories high (cmh) and low (cml). the cml and cmh are mapped so that each location corresponds to an output channel on the output streams. the number of source address bits in cmh and cml to be utilized varies according to the switching con?uration selected in the ims register. for details on the use of the source address data (cab and sab bits), see cmh and cml bit describe- thin (figures 5 & 6). once the source address bits are programmed by the cpu, the contents of the data memory at the selected address are transferred to the parallel-to-serial converters. by having the output channel specify the source channel through the connect memory, the user can route the same input channel to several output channels, allowing broadcast facility within the switch. in the message mode the cpu writes data to the connect memory low locations corresponding to the output link and channel number. the contents of the connect memory low are transferred directly to the parallel-to-serial converter one channel before it is to
MT89L86 advance information 6 be output. the connect memory low data is transmitted on to the output every frame until it is changed by the cpu with a new data. the features of each output channel in the 3.3v MT89L86 are controlled by the connect memory high bits. these bits determine individual output channels to be in message or connection mode, select throughput delay types and enable/disable output drivers. the connect memory high also provides additional stream and channel address bits for some con?urations. in addition, the connect memory high provides one bit to allow the user to control the cst output in 2.048 mb/s applications. if an output channel is set to high-impedance, the tdm serial stream output will be placed in high impedance during that channel time. in addition to the per-channel control, all channels on the tdm outputs can be placed in high impedance by pulling the ode input pin low. this overrides the individual per-channel programming by the connect memory high bits. the connect memory data is received via the microprocessor interface through the data i/o lines. the addressing of the MT89L86 internal registers, data and connect memories is performed through address input pins and some bits of the device's control register. the higher order address bits come from the control register, which may be written or read through the microprocessor interface. the lower order address bits come directly from address input pins. for details on the device addressing, see software control and control register bits description (figure 3 & tables 5, 6 and 7). serial data interface the master clock (clk) can be either at 4.096 or 8.192 mhz allowing serial data link operations at 2.048, 4.096 and 8.192 mb/s. these data rates can be independently selected on input and output streams allowing this MT89L86 device to be used in various speed backbones and in rate conversion applications. the selected data rates apply to the inputs or the output streams. different bit rates among input streams or among output streams are not allowed. due to the i/o data rate selection ?xibility, two major operations can be selected: identical or different i/o data rates. the dmo bit (device main operation) in the ims register is used for selecting between identical i/o rates or different i/o rates. on system power-up, the cpu should set up the dmo, the idr (input data rate) and odr (output data rate) bits located in the ims register. when identical i/o data rates are selected by the dmo bit, the switching con?uration and the number of the device's input and output streams can be selected through the scb bits (switching con?uration bits) in the ims register. see switching con?urations section for details. depending on the application, the interface clock can be selected to be twice the data rate or equal to the data rate. this selection is performed through bit clkm in the ims register. for applications where both serial inputs and outputs are at 2.048 mb/s (st- bus or gci format), the clkm bit should be set low enabling the interface clock to be twice the bit rate. in applications where both inputs and outputs are at 4.096 or 8.192 mb/s, clkm should be set high enabling the interface clock to be equal to the bit rate. in applications where inputs and outputs are at different rates, the clkm bit has no effect. in applications with serial links at 2.048 mb/s (see figures 15 to 18), the input 8 khz frame pulse can be in either st-bus or gci format. this MT89L86 automatically detects the presence of an input frame pulse and identi?s what type of backbone is present on the serial interface. upon determining the interface connected to the serial port, the internal timing unit establishes the appropriate transmit and sampling edges. in st-bus format, every second falling edge of the 4.096 mhz clock marks a bit boundary and the input data is clocked in by the rising edge, three quarters of the way into the bit cell. in gci format, every second rising edge of the 4.096 mhz clock marks the bit boundary while data sampling is performed during the falling edge, at three quarters of the bit boundaries. for identical i/o rates at 4.096 and 8.192 mb/s (see figure 19), the clock and interface data rates are equal. the bit transmit and sampling edges vary according to the applied frame pulse polarity. for example, if the fr pulse polarity is positive, the bit transmit operation is done on every rising edge of clk and the bit sampling on every falling edge. if the fr pulse polarity is negative, these edges are inverted. for different i/o rates, the MT89L86 side operating at 2.048 mb/s data rate will comply with st-bus or gci interfaces for transmit and sampling procedures. the MT89L86 side operating at 4.096 or 8.192 mb/s behaves according to the frame pulse polarity applied. see figures 21 to 24. switching con?urations switching con?urations are determined basically by the interface rates selected at the serial inputs and outputs. to specify the switching con?uration
advance information MT89L86 7 required, the ims register has to be initialized on system power-up. in case of identical i/o rates (dmo bit low) at both inputs and outputs, the switching con?uration is selected by the two scb bits as shown in table 8 (see ims register). in case of different i/o rates (dmo bit high), the switching con?uration is always non-blocking with different number of i/o streams which is de?ed by the idr and odr bits (see ims register). identical input/output data rates when identical input/output data rate is selected by the dmo bit, the i/o rate is determined by the idr0- 1 bits, and the odr0-1 bits are ignored. for each data rate speci?d by the idr bits, different switching con?urations can be selected in the scb1-0 bits. ser ial links with data rates at 2.048 mb/s when the 2.048 mb/s data rate is selected at the idr bits, four different i/o con?urations can be selected by the scb1-0 bits (see table 8); 8 x 8, 16 x 8, 4 x 4 with stream pair selection and nibble switching. if 8 x 8 switching con?uration is selected, a 256 x 256 channel non-blocking switching matrix is available. in this con?uration, the 3.3v MT89L86 is con?ured with 8 input and 8 output data streams with 32 64 kbit/s channels each. the interface clock for this operation is 4.096 mhz with both st-bus and gci compatibilities and the per-channel selection between variable and constant throughput delay functions is provided. in 16 x 8 switching con?uration, a 512 x 256 channel blocking switch matrix is available. this con?uration is available only when the cpu bus interface is con?ured in the multiplexed mode. the device clock in this application is 4.096 mhz, st- bus or gci compatible. this con?uration only provides variable throughput delay. if the stream pair selection switching con?uration is selected, only four input and four outputs (4 pairs of serial streams) can be selected by the cpu to be internally connected to the switch matrix, totalling a 128 x 128 channel non-blocking switch. from the 10 serial link pairs available, two pairs are permanently connected to the internal matrix (sti0/sto0 and sti1/sto1). an internal stream pair selection capability allows two additional pairs of serial links to be selected from the remaining 8 pairs (from sti/ sto2 to sti9/sto9) and be connected to the internal matrix along with the permanently connected sti0/ sto0 and sti1/sto1 streams. the two additional pair of streams called stream pair a and stream pair b, should be selected in the stream pair selection register (sps). the device clock for this operation is 4.096 mhz compatible to st-bus and gci interfaces. in addition, the per-channel selection between variable or constant throughput delay is available. in the nibble switching con?uration, 4-bit wide 32 kb/s data channels can be switched within the device. every serial stream is run at 2.048 mb/s and transports 64 nibbles per frame. when the nibble switching is selected at scb bits, the 3.3v MT89L86 automatically assumes a 8-input x 4-output stream con?uration, providing a blocking switch matrix of 512 x 256 nibbles. if a non-blocking switch matrix is required for nibble switching, the switch capacity is reduced to 256 x 256 channel with a 4 input x 4 output con?uration; the non-blocking matrix can be arranged by the user by selecting any four of the 8 input streams. in nibble switching the interface clock is 4.096 mhz. ser ial links with data rates at 4.096 mb/s two i/o con?urations can be enabled by the scb bits when input and output data rates are 4.096 mb/s on each serial stream: 8 x 4 and 4 x 4. when 8 x 4 switching con?uration is selected, a 512 x 256 channel blocking switch is available with serial streams carrying 64, 64 kb/s channels each. for this operation, a 4.096 mhz interface clock equal to the bit rate should be provided to the 3.3v MT89L86. only variable throughput delay mode is provided. in the 4 x 4 switching con?uration, a 256 x 256 channel non-blocking switch is available with serial streams carrying 64, 64 kb/s channels each. in this con?uration, the interface clock is 4.096 mhz and the per-channel selection between variable and constant throughput delay operation is provided. figure 19 shows the timing for 4.096 mb/s operation. ser ial links with data rates at 8.192 mb/s only 2 input x 2 output stream con?uration is available for 8.192 mb/s, allowing a 256 x 256 channel non-blocking switch matrix to be implemented. to enable this operation, the idr bits should be programmed to select 8.192 mb/s rates and the scb bits have no effect. at 8.192 mb/s, every input and output stream provides 128 time- slots per frame. the interface clock for this operation should be 8.192 mhz. figure 19 shows the timing for 8.192 mb/s operation. table 1 summarizes the 3.3v MT89L86 switching con?urations for identical i/o data rates.
MT89L86 advance information 8 table 1 - switching con?urations for identical input and output data rate serial interface data rate interface clock required at clk pin (mhz) number of input x output streams matrix channel capacity input/output streams used variable/ constant throughput delay selection 2 mb/s 4.096 8x8 256x256 non-blocking sti0-7/sto0-7 yes 2 mb/s 4.096 16x8 512x256 blocking sti0-15/sto0-7 no 2 mb/s 4.096 10x10 128x128 non-blocking (only 4-input x 4-output can be selected) sti0-9/sto0-9 yes nibble switching (2 mb/s) 4.096 8x4 512x256 nibbles sti0-7/sto0-3 no 4 mb/s 4.096 8x4 512x256 blocking sti0-7/sto0-3 no 4 mb/s 4.096 4x4 256x256 non-blocking sti0-3/sto0-3 yes 8 mb/s 8.192 2x2 256x256 non-blocking sti0-1/sto0-1 yes table 2 - switching con?urations for different i/o data rates input and output data rates interface clock required at clk pin (mhz) number of input x output streams matrix channel capacity input/output streams used variable/ constant throughput delay selection 2 mb/s to 4 mb/s 4.096 8x4 256x256 non-blocking sti0-7/sto0-3 yes 2 mb/s to 8 mb/s 8.192 8x2 256x256 non-blocking sti0-7/sto0-1 yes 4 mb/s to 2 mb/s 4.096 4x8 256x256 non-blocking sti0-3/sto0-7 yes 8 mb/s to 2 mb/s 8.192 2x8 256x256 non-blocking sti0-1/sto0-7 yes different input/output data rates when different i/o rate is selected by the dmo bit, the input and output data rates should be selected at the idr and odr bits, respectively. the switching con?uration bits (scb) are ignored with this operation. this selection allows the user to multiplex conventional 2.048 mb/s serial streams into two higher rates and vice-versa. in addition to the rate conversion itself, the MT89L86 allows for a complete 256 x 256 channel non-blocking switch at different rates. in this operation, the per-channel variable/ constant throughput delay selection is provided. depending on which data rates are programmed for input and output streams, the number of data streams used on the input and output as well as the serial interface clock (clk input pin) is different. once the cpu de?es the data rates at the idr and odr bits, the MT89L86 automatically con?ures itself with the appropriate number of input and output streams for the desired operation. table 2 summarizes the four options available when it is used with different i/o rates. figures 21 to 24 show the timing for each of the four modes shown in table 2. input frame offset selection for the 4.096 and 8.192 mb/s serial interface data rates, the MT89L86 provides a feature called input frame offset allowing the user to compensate for the varying delays at the incoming serial inputs while building large switch matrices. usually, different delays occur on the digital backbones causing the data and frame synchronization signals to be skewed at the input of the switch device. this may result in the system frame synchronization pulse to be active at the MT89L86s fr input before the ?st bit of the frame is received at the serial inputs.
advance information MT89L86 9 when the input frame offset is enabled, an "internal delay" of up to four clock periods is added to the actual data input sampling, providing the MT89L86 serial timing unit a new input frame reference. an internal virtual frame is created which is aligned with the framing of the actual serial data coming in at the serial inputs and not with the fr frame pulse input. in this operation, the transmission of the output frame on the serial links is still aligned to the frame pulse input signal (fr). the selection of the data input sampling delay is de?ed by the cpu in the frame input offset register (fio). if this function is not required in the user's applications, the fio register should be set up during system initialization to a state where offset functions are disabled. delay through the MT89L86 the switching of information from the input serial streams to the output serial streams results in a delay. depending on the type of information to be switched, this MT89L86 can be programmed to perform time-slot interchange functions with different throughput delay capabilities on a per-channel basis. for voice applications, variable throughput delay can be selected ensuring minimum delay between input and output data. in wideband data applications, constant throughput delay can be selected maintaining the frame integrity of the information through the switch. the delay through the device varies according to the type of throughput delay selected in the v /c bit of the connect memory high. variable throughput delay mode (v /c bit = 0) identical i/o data rates the delay in this mode is dependent on the combination of source and destination channels and it is independent of the input and output streams. the minimum delay achievable in this MT89L86 depends on the data rate selected for the serial streams. for instance, for the 2.048 mb/s data rate, the minimum delay achieved corresponds to three time-slots. for the 4.096 mb/s data rate it corresponds to ?e time-slots while it is nine time- slots for the 8.192 mb/s data rate. switching table 3a - variable throughput delay values for identical i/o rate applications n= input channel, t.s. = time-slot table 3b - min/max throughput delay values for different i/o rate applications notes: dmin and dmax are measured in time-slots and at the point in time when the output channel is completely shifted out. t.s. = time-slot fr. = 125 s frame 2 mb/s t.s. = 3.9 s 4 mb/s t.s. = 1.95 s 8 mb/s t.s. = 0.975 s input rate output channel (# m) m < n m=n, n+1, n+2 m= n+3, n+4 m=n+5, .. n+8 m > n+8 2.048 mb/s 32-(n-m) t.s. m-n + 32 t.s. m-n t.s. m-n t.s. m-n t.s. 4.096 mb/s 64-(n-m) t.s. m-n + 64 t.s. m-n+64 t.s. m-n t.s. m-n t.s. 8.192 mb/s 128-(n-m) t.s. m-n + 128 t.s. m-n+128 t.s. m-n+128 t.s. m-n t.s. i/o data rate con?uration output stream used 0, 1 2, 3 4, 5 6, 7 2 mb/s to 4 mb/s dmin=5x 4mb/s t.s. dmax=1 fr.+(4x 4mb/s t.s.) 2 mb/s to 8 mb/s dmin=9x 8mb/s t.s. dmax=1 fr.+(8x 8mb/s t.s.) 4 mb/s to 2 mb/s dmin=3x 2mb/s t.s. dmax=1 fr.+(2x 2mb/s t.s.) dmin=(2x 2mb/s t.s.)+(1x 4mb/s t.s.) dmax=1 fr.+(1x 2mb/s t.s.)+(1x 4mb/s t.s.) 8 mb/s to 2 mb/s dmin=3x 2mb/s t.s. dmax=1 fr.+(2x 2mb/s t.s.) dmin=(2x 2mb/s t.s.)+ (3x 8mb/s t.s.) dmax=1 fr.+(1x 2mb/s t.s.)+(3x 8mb/s t.s.) dmin=(2x 2mb/s t.s.)+ (2x 8mb/s t.s.) dmax=1 fr.+(1x 2mb/s t.s.)+(2x 8mb/s t.s.) dmin=(2x 2mb/s t.s.)+ (1x 8mb/s t.s.) dmax=1 fr.+(1x 2mb/s t.s.)+(1x 8mb/s t.s.)
MT89L86 advance information 10 table 4 - constant throughput delay values data rate throughput delay (d) 2.048 mb/s d=[32 + (32 - in) + (out - 1)]; (expressed in # time-slots) 2.048 mb/s time-slot: 3.9 s in: input time-slot (from 1 to 32) out: output time-slot (from 1 to 32) 4.096 mb/s d=[64 + (64 - in) + (out - 1)]; (expressed in # time-slots) 4.096 mb/s time-slot: 1.95 s in: input time-slot (from 1 to 64) out: output time-slot (from 1 to 64) 8.192 mb/s d=[128 + (128 - in) + (out - 1)]; (expressed in # time-slots) 8.192 mb/s time-slot: 0.975 s in: input time-slot (from 1 to 128) out: output time-slot (from 1 to 128) con?urations with input and output channels that provides more than its corresponding minimum throughput delay, will have a throughput delay equal to the difference between the output and input channels; i.e., the throughput delay will be less than one frame period. table 3a shows the throughput delay for each data rate operation. diff erent i/o data rates except for the 2 mb/s to 4 mb/s and the 2 mb/s to 8 mb/s rate conversion operations, the throughput delay from the MT89L86 may vary according to the output stream used for switching. table 3b explains the worst case conditions for the throughput delay when different i/o data rate switching con?urations are used. constant throughput delay mode (v /c bit = 1) in this mode frame sequence integrity is maintained in both identical and different i/o data rate operations by making use of a multiple data-memory buffer technique. the input channels written in any of the buffers during frame n will be read out during frame n+2. in applications at 2.048 mb/s for instance, the minimum throughput delay achievable in constant delay mode will be 32 time-slots; for example, when input time-slot 32 (channel 31) is switched to output time-slot 1 (channel 0). likewise, the maximum delay is achieved when the ?st time slot in a frame (channel 0) is switched to the last time-slot in the frame (channel 31), resulting in 94 time-slots of delay. to summarize, any input time-slot from input frame n will always be switched to the destination time-slot on output frame n+2. table 4 describes the constant throughput delay values at different data rates. microprocessor port the non-multiplexed bus interface provided by the MT89L86 is identical to that provided in the mt8986 digital switch device. in addition to the non- multiplexed bus, this 3.3v MT89L86 device provides an enhanced microprocessor interface with multiplexed bus structure compatible to both motorola and intel buses. the multiplexed bus structure is selected by the cpu interface mode (im) input pin. if the im input pin is connected to ground, the MT89L86s parallel port assumes its default motorola non-multiplexed bus mode identical to that of mt8986. if the im input is connected high, the internal parallel microprocessor port provides compatibility to motel ( mo torola and in tel compatible bus) interface allowing direct connection to intel, national and motorola cpus. the on-chip motel circuit automatically identi?s the type of cpu bus connected to the device. this circuit uses the level of the ds/rd input pin at the rising edge of the as/ale to identify the appropriate bus timing connected to the MT89L86. if ds/rd is low at the rising edge of as/ale then the motorola bus timing is selected. if ds/rd is high at the rising edge of as/ale, the intel bus timing is selected. when the parallel port of this device is operating in motorola, national or intel multiplexed bus interfaces, the signals available for controlling the device are: ad0-ad7 (data and address), ale/as (address latch enable/address strobe), ds/rd (data strobe/read), r/w \wr (read/write\write), cs (chip select) and dt a (data acknowledgment). in the motorola non-multiplexed bus mode, the interface control signals are: data bus (ad0-ad7),
advance information MT89L86 11 six address input lines (a0-a5) and four control lines (cs , ds, r/w and dt a ). see figures 25 to 27 for each cpu interface timing. the parallel microprocessor port provides the access to the ims, control registers, the connection memory high, the connection memory low and the data memory. all locations can be read or written except for the data memory which can be read only. software control the address bus on the microprocessor interface selects the internal registers and memories of the MT89L86. if the a5 address input is low, the internal control, interface mode, stream pair selection and frame input offset registers are addressed by the a4 to a0 bits according to table 5. if the a5 input is high, the remaining address input lines are used to select memory subsections of up to 128 locations corresponding to the maximum number of channels per input or output stream. the address input lines and the stream address bits (sta) of the control register give the user the capability of accessing all sections of the MT89L86s data and connect memories. the control and interface mode selection registers together control all the major functions of the device. the interface mode select register should be set up during system power-up to establish the desired switching con?uration as explained in the serial interface and switching con?urations sections. the control register is dynamically used by the cpu to control switching operations in the MT89L86. the control register selects the device's internal memories and its subsections to specify the input and output channels selected for switching procedures. the data in the control register consists of split memory and message mode bits, memory select and stream address bits. the memory select bits allow the connect memory high or low or the data memory to be chosen, and the stream address bits de?e an internal memory subsections corresponding to input or output st-bus streams. bit 7 (slip memory) of the control register allows split memory operation whereby reads are from the data memory and writes are to the connect memory low. the message enable bit (bit 6) places every output channel on every output stream in message mode; i.e., the contents of the connect memory low table 5 - address memory map *: channels 0 to 31 are used in 2.048 mb/s (8 x 8, 16 x 8 and 10 x 10) **: channels 0 to 63 are used in 4.096 mb/s (nibble switching, 4 x 4, 8 x 4 or different i/o rates) ***: channels 0 to 127 are used in 8.192 mb/s (2 x 2 or different i/o rates) a7 a6 a5 a4 a3 a2 a1 a0 location xx000000 control register xx000001 interface mode select register xx000010 stream pair select register xx000011 fr ame input offset register 00100000 channel 0* 0 0 0 0 1 1 1 1 0 1 0 1 0 1 0 1 1 1 channel 1* channel 31* 01100000 channel 32** 0 0 1 1 1 1 1 1 0 1 0 1 0 1 0 1 1 1 channel 33** channel 63** 1 1 0 1 1 1 1 1 0 1 0 1 0 1 0 1 0 1 channel 64*** channel 127***
MT89L86 advance information 12 (cml) are output on the st-bus output streams once every frame unless the ode input pin is low. if me bit is high, then the MT89L86 behaves as if bits 2 (message channel) and 0 (output enable) of every connect memory high (cmh) locations were set to high, regardless of the actual value. if me bit is low, then bit 2 and 0 of each connect memory high location function normally. for example, if bit 2 of the cmh is high, the associated st-bus output channel is in message mode. if bit 2 of the cmh is low, then the contents of the sab and cab bits of the cmh and cml de?e the source information (stream and channel) of the time-slot that is to be switched to an output. if the ode input pin is low, then all serial outputs are set to high impedance. if ode is high, then bit 0 (output enable) of the cmh location enables (if high) or disables (if low) the output drivers for the corresponding individual st-bus output stream and channel. the contents of bit 1 (csto bit) of each connection memory high location is output to the csto pin once every frame. the csto pin is a 2048 mbit/s output which carries 256 bits. if csto bit is set high, the corresponding bit on csto output is transmitted high. if csto bit is low, the corresponding bit on the csto output is transmitted low. the contents of the 256 csto bits of the cmh are transmitted sequentially to the csto output pin and are synchronous to the 2.048 mb/s st-bus streams. to allow for delay in any external control circuitry the contents of the csto bit is output one channel before the corresponding channel on the st-bus streams. for example, the contents of csto bit in position 0 (st0, ch0) of the cmh, is transmitted synchronously with st-bus channel 31, bit 7. the contents of csto bit in position 32 (st1, ch0) of the cmh is transmitted during st-bus channel 31 bit 6. for more detailed description of the csto operation, see section 6 of application note msan-123. the v /c bit (variable/constant delay) of each connect memory high location allows the per- channel selection between variable and constant throughput delay modes. initialization of the MT89L86 on initialization or power up, the contents of the connection memory high can be in any state. this is a potentially hazardous condition when multiple MT89L86 st-bus outputs are tied together to form matrices, as these outputs may con?ct. the ode pin should be held low on power up to keep all outputs in the high impedance condition. during the microprocessor initialization routine, the microprocessor should program the desired active paths through the matrices, and put all other channels into the high impedance state. care should be taken that no two st-bus outputs drive the bus simultaneously. when this process is complete, the microprocessor controlling the matrices can bring the ode signal high to relinquish the high impedance state control to the oe bit of the cmh (cmh b 0s). a reset pin is available for the 48-pin ssop package. when this pin is set low for a minimum of 100n sec, the st-bus outputs are put to the high impedance state and all register contents are set to zero.
advance information MT89L86 13 control register - read/write figure 3 - control register description bit name description 7sm split memory. when 1, all subsequent reads are from the data memory and writes are to the connection memory low, except when the control register is accessed again. when 0, the memory select bits specify the memory for subsequent operations. in either case, the stream address bits select the subsection of the memory which is made available. 6me message enable. when 1, the contents of the connection memory low are output on the serial output streams except when in high impedance as set by the ode input. when 0, the connection memory bits for each channel determine the output of the serial streams. 5sta3 stream address bit 3. when the 16 x 8 switching con?uration is selected, this pin is used with sta2-0 to select one of the 16 input data streams whenever the data memory is to be read. the programming of this bit has no effect in other switching con?urations. 4-3 ms1-0 memory select bits. the memory select bits operate as follows: 0-0 - not to be used 0-1 - data memory (read only from the cpu) 1-0 - connection memory low 1-1 - connection memory high 2-0 sta2-0 the number expressed in binary notation on these bits refers to the input or output st-bus stream which corresponds to the subsection of memory made accessible for subsequent operations. the use of these bits depends on the switching con?uration as well as the devices main operation de?ed by the dmo bit of the interface mode selection register. tables 6 and 7 show the utilization of these bits according to the devices main operation. sm me sta3 ms1 ms0 sta2 sta1 sta0 76543210
MT89L86 advance information 14 table 6 - use of sta bits for identical i/o data rate operation * - for data memory read operations a0 is not required since two nibbles are provided per read access. table 7 - use of sta bits for different i/o data rate operation note:in rate conversion applications, data memory subsections have different sizes than connection memory subsections. this implies that different address inputs are used to select individual positions within the subsections for each type of memory. identical i/o rate # of input x output streams sta bits used to select subsections of the data memory sta bits used to select subsections of the connection memory input address pins used to select individual connection and data memory positions within the selected subsection 2 mb/s 8x8 sta2, sta1, sta0 sta2, sta1, sta0 a4, a3, a2, a1, a0 2 mb/s 4x4 sta1, sta0 sta1, sta0 a4, a3, a2, a1, a0 2 mb/s 16x8 sta3, sta2, sta1, sta0 sta2, sta1, sta0 a4, a3, a2, a1, a0 4 mb/s 4x4 sta1, sta0 sta1, sta0 a6, a4, a3, a2, a1, a0 4 mb/s 8x4 sta2, sta1, sta0 sta1, sta0 a6, a4, a3, a2, a1, a0 8 mb/s 2x2 sta0 sta0 a7, a6, a4, a3, a2, a1, a0 nibble switch (2 mb/s) 8x4 sta2, sta1, sta0 sta1, sta0 a6, a4, a3, a2, a1, a0 * different i/o rate input x output streams con?. sta bits used to select data memory subsections sta bits used to select connection memory subsections input address pins used to access individual data memory positions within the selected subsection input address pins used to access individual connection memory positions within the selected subsection 2 mb/s to 4 mb/s 8x4 sta2, sta1, sta0 sta1, sta0 a4, a3, a2, a1, a0 a6, a4, a3, a2, a1, a0 2 mb/s to 8 mb/s 8x2 sta2, sta1, sta0 sta0 a4, a3, a2, a1, a0 a7, a6, a4, a3, a2, a1, a0 4 mb/s to 2 mb/s 4x8 sta1, sta0 sta2, sta1, sta0 a6, a4, a3, a2, a1, a0 a4, a3, a2, a1, a0 8 mb/s to 2 mb/s 2x8 sta0 sta2, sta1, sta0 a7, a6, a4, a3, a2, a1, a0 a4, a3, a2, a1, a0
advance information MT89L86 15 interface mode selection register - read/write figure 4 - ims register description bit name description 7 dmo device main operation. this bit is used by the cpu to de?e one of the two main operations of the 3.3v MT89L86. if this bit is low, the MT89L86 is con?ured for identical i/o data rates. for this operation, the user should also specify the switching con?uration through the scb bits. if this bit is high, the MT89L86 is con?ured in different i/o data rate. this allows combinations of input and output data rates as shown in table 2. the scb bits have no effect in this application and the device is in non-blocking switch con?uration with a 256 x 256 channel capacity. 6-5 idr1-0 input data rate selection. these two bits select three different data rates for the inputs of the MT89L86. in the case of identical i/o rates (dmo bit = 0), these bits also determine the serial output data rate. idr1 idr0 input rate 0 0 2.048 mb/s 0 1 4.096 mb/s 1 0 8.192 mb/s 1 1 reserved 4-3 odr1-0 output data rate selection. these bits are only used when different i/o rates are selected (dmo bit=1). these two bits select three different data rates for the serial outputs of the MT89L86. these bits are ignored if dmo bit = 0. odr1 odr0 output rate 0 0 2.048 mb/s 0 1 4.096 mb/s 1 0 8.192 mb/s 1 1 reserved 2-1 scb1-0 switching con?uration bits 1-0. these bits should only be used when dmo is set low. the use of these bits to select the switching con?uration of the MT89L86 is described in table 8. 0 clkm clock mode. this bit is only used when the MT89L86 is set to operate in identical i/o data rates. when set high, this bit selects the interface clock to be equal to the bit rate. if low, this bit selects the interface clock to be twice the bit rate. for different i/o data rate applications, this bit is ignored. dmo idr1 idr0 odr1 odr0 scb1 scb0 clkm 76543210
MT89L86 advance information 16 table 8 - switching con?urations for identical i/o rates dmo bit data rate selected at idr bits (mb/s) scb1 scb0 con?uration low identical i/o rates 2.048 0 0 8 inputs x 8 outputs - non blocking 0 1 16 inputs x 8 outputs - blocking 1 0 stream pair selection capability (internal channel capacity = 128 x 128) - non blocking 1 1 nibble switching - 8 inputs x 4 outputs - blocking 4.096 0 0 8 inputs x 4 outputs - blocking 0 1 4 inputs x 4 outputs - non-blocking 1 0 reserved 1 1 reserved 8.192 no effect no effect 2 inputs x 2 outputs - non-blocking high different i/o rates input/output rate selected in idr/odr bits no effect no effect reserved
advance information MT89L86 17 connection memory high - read/write figure 5 - connection memory high (cmh) bits x=don? care bit name description 6v /c variable/constant throughput delay mode. this bit is used to select between variable (low) and constant delay (high) modes in a per-channel basis. tables 1 and 2 describe the switching con?urations that have this function. in the modes where this function is not available, this bit ignored. 5 sab3 source stream address bit 3. this bit is used along with bits sab0-2 in cml to select up to 16 different source streams for the connection. depending on the state of dmo bit and the switching con?uration enabled, not all sab3-0 bits have to be used. see tables 9 and 10 for details on the utilization of the sab bits. 4-3 cab6-5 source channel address bits 5 and 6. these two bits are used together with bits cab0-4 in connect memory low to select up 128 different source channels for the connection. depending on the data rate used in the input/output streams, 5, 6 or all 7 cab bits can be used respectively, to select 32, 64 or 128 different channels. see tables 9 and 10 for details on the utilization of the cab bits. 2 mc message channel. when 1, the contents of the corresponding location in connection memory low are output on the corresponding channel and stream. when 0, the contents of the programmed location in connection memory low act as an address for the data memory and so determine the source of the connection to the locations channel and stream. 1 csto csto bit. this bit is only available in 2.048 mb/s applications. it drives a bit time on the csto output pin. 0 oe output enable. this bit enables the output drivers on a per-channel basis. this allows individual channels on individual streams to be made high-impedance, allowing switch matrices to be constructed. a high enables the driver and a low disables it. xv /c sab3 cab6 cab5 mc csto oe 76543210 (cm high bits)
MT89L86 advance information 18 connection memory low - read/write figure 6 - connection memory low (cml) bits table 9 - cab and sab bits programming for identical i/o rate applications table 10 - cab and sab bits programming for different i/o rate applications bit name description 7-5 sab2-0* source stream address bits. these three bits are used together with sab3 in cmh to select up to 16 different source streams for the connection. depending on the switching con?uration and the data rate selected in the application, 1, 2, 3 or all 4 sab bits can be used. see tables 9 and 10 for details. 4-0 cab4-0* source channel address bits 0-4. these ?e bits are used together with cab5-6 in cmh to select up 128 different source channels for the connection. depending on the switching con?uration and the data rate used in the application, 5, 6 or all 7 cab bits can be used to select respectively 32, 64 or 128 different channels. see tables 9 and 10 for details. if bit two (mc) of the corresponding connection high locations is 1, or if bit 6 of the control register is 1, then these entir e eight bits are output on the corresponding output channel and stream associated with this location. otherwise, the bits are used as indicated to defi ne the source of the connection which is output on the channel and stream associated with this location. identical i/o rate # of input x output streams cab bits used to determine the source channel for the connection sab bits used to determine the source stream for the connection 2 mb/s 8x8 cab4 to cab0 (32 channel/stream) sab2, sab1, sab0 2 mb/s 4x4 cab4 to cab0 (32 channel/stream) sab2, sab1 2 mb/s 16x8 cab4 to cab0 (32 channel/stream) sab3, sab2, sab1, sab0 4 mb/s 4x4 cab5 to cab0 (64 channel/stream) sab2, sab1 4 mb/s 8x4 cab5 to cab0 (64 channel/stream) sab2, sab1, sab0 8 mb/s 2x2 cab6 to cab0 (128 channel/stream) sab2 nibble switch (2 mb/s) 8x4 cab5 to cab0 (64 nibble/stream) sab2, sab1, sab0 different i/o rate # of input x output streams cab bits used to determine the source channel for the connection sab bits used to determine the source stream for the connection 2 mb/s to 4 mb/s 8x4 cab4 to cab0 (32 channel/stream) sab2, sab1, sab0 2 mb/s to 8 mb/s 8x2 cab4 to cab0 (32 channel/stream) sab2, sab1, sab0 4 mb/s to 2 mb/s 4x8 cab5 to cab0 (64 channel/stream) sab2, sab1 8 mb/s to 2 mb/s 2x8 cab6 to cab0 (128 channel/stream) sab2 sab2 sab1 sab0 cab4 cab3 cab2 cab1 cab0 76543210 (cm low bits)
advance information MT89L86 19 stream pair selection register - read/write figure 7 - stream pair selection (sps) register x=don? care frame input offset register - read/write figure 8 - frame input offset (fio) register x=don? care bit name description 5-3 spa2-0 stream pair a selection . these three bits de?e which pair of streams are going to be connected to the switch matrix, together with the permanently connected streams sti0-1 / sto0-1. sp a2 sp a1 sp a0 stream p air a connected 0 0 0 sti2 / sto2 0 0 1 sti3 / sto3 0 1 0 sti4 / sto4 0 1 1 sti5 / sto5 1 0 0 sti6 / sto6 1 0 1 sti7 / sto7 1 1 0 sti8 / sto8 1 1 1 sti9 / sto9 2-0 spb2-0 stream pair b selection . these three bits de?e which pair of streams are going to be connected to the switch matrix, together with the permanently connected streams sti0-1 / sto0-1. spb2 spb1 spb0 stream p air b connected 0 0 0 sti2 / sto2 0 0 1 sti3 / sto3 0 1 0 sti4 / sto4 0 1 1 sti5 / sto5 1 0 0 sti6 / sto6 1 0 1 sti7 / sto7 1 1 0 sti8 / sto8 1 1 1 sti9 / sto9 these bits are only used when the switching configuration bits enable stream pair selection capability (scb 1-0 =10) and the in put data rate selection bits enable 2 mb/s operation (idr-0 = 00). in all other modes, the contents of this register are ignored. bit name description 7-5 ofb2-0 offset bits 2-0 . these three bits de?e the time it takes the serial interface receiver to recognize and store the ?st bit of the serial input streams; i.e., to start assuming a new internal frame. the input frame offset can be selected to be up to 4 ck clock periods from the time when frame pulse input signal is applied to the fr input. ofb2 ofb1 ofb0 number of cloc k p eriods 0 0 0 normal operation. no bit offsetting. 00 1 1 01 0 2 01 1 3 10 0 4 1 0 1 reserved 1 1 0 reserved 1 1 1 reserved if frame input offset operation is not required, this register should be cleared by the cpu during system initialization. x x spa2 spa1 spa0 spb2 spb1 spb0 76543210 ofb2 ofb1 ofb0 x x x x x 76543210
MT89L86 advance information 20 applications switch matrix architectures the MT89L86 is an ideal device for designs of medium size switch matrix. for applications where voice and grouped data channels are transported within the same frame, the voice samples have to be time interchanged with a minimum delay while maintaining the integrity of grouped data. to guarantee the integrity of grouped data during switching and to provide a minimum delay for voice connections, the MT89L86 provides the per-channel selection between variable and constant throughput delay. this can be selected by the v /c bit of the connection memory high locations. different con?urations at different data rates can be built to accommodate non-blocking matrices of up to 512 channels while maintaining the per channel selection of the device's throughput delay. some examples of such non-blocking con?urations are given in figures 9 to 11. for applications where voice and data samples are encoded into individual 64 kb/s time-slots on an 8khz frame basis, the switch matrix can operate with time interchange procedures where only variable figure 9 - 512-channel switch with serial streams at 2.048 mb/s figure 10 - 256-channel switch with rate conversion between 2.048 and 4.096 mb/s figure 11 - 256-channel switch with rate conversion between 2.048 and 8.192 mb/s MT89L86 #1 MT89L86 #3 MT89L86 #2 MT89L86 #4 in out 8 streams @ 2.048 mb/s 8 streams @ 2.048 mb/s 8 streams @ 2.048 mb/s 8 streams @ 2.048 mb/s MT89L86 in 8 streams @ 2.048 mb/s MT89L86 4 streams @ 4.096 mb/s sti0 sti7 sto0 sto7 sto0 sto1 sto2 sto3 sti0 sti1 sti2 sti3 8 streams @ 2.048 mb/s out MT89L86 in 8 streams @ 2.048 mb/s MT89L86 2 streams @ 8.192 mb/s sti0 sti7 sto0 sto7 sto0 sto1 sti0 sti1 8 streams @ 2.048 mb/s out
advance information MT89L86 21 throughput delay is guaranteed. for such applications, the MT89L86 allows cost effective implementations of non-blocking matrices ranging up to 1024 channels. figures 12 and 13 show the block diagram of implementations with non-blocking capacities of 512 and 1024-channel, respectively. interfacing the MT89L86 with 8051 the intel 8051 is a very cost effective solution for many applications that do not require a large cpu interaction and processing overhead. however, in applications where 8051 is connected to peripherals operating on a synchronous 8 khz time-base like the MT89L86, some connectivity issues have to be addressed. the MT89L86 may hold the cpu read/ write cycle due to internal contention between the on-chip microprocessor port and the internal serial- to-parallel and parallel-to-serial converters. since the 8051 family of cpus do not provide data ready type of inputs, some external logic and software intervention have to be provided between the MT89L86 and the 8051 microcontroller to allow read/ write operations. the external logic described in figure 14 is a block diagram of a logical connection between the MT89L86 and 8051. its main function is to store the 8051 data during a write and the MT89L86 data during a read. for a write, address is latched by the MT89L86s internal address latch on the falling edge of the ale input. whenever a read or write operation is done to the MT89L86, the address decoded signal (mt a ) is used to latch the state of rd , wr , and the ale signals, until the data acknowledge output signal is provided by the MT89L86, releasing the latches for a new read/write cycle. latch u5 is used to hold the 8051 data for a write until the cpu is ready to accept it (when dt a goes low). latch u4 stores the MT89L86 output data during a read cycle whenever figure 12 - 512-channel non-blocking switch matrix with serial streams at 2.048 or 4.096 mb/s figure 13 - 1024-channel non-blocking switch matrix with serial streams at 2.048 mb/s in out 16 streams @2.048 mb/s 8 streams @2.048 mb/s 8 streams @2.048 mb/s 16 8 8 MT89L86 MT89L86 512 x 256 512 x 256 in out 8 streams @4.096 mb/s 4 streams @4.096 mb/s 4 streams @4.096 mb/s 8 4 4 MT89L86 MT89L86 512 x 256 512 x 256 in in 16 streams @2.048 mb/s 16 streams @2.048 mb/s MT89L86 512 x 256 MT89L86 512 x 256 MT89L86 512 x 256 MT89L86 512 x 256 MT89L86 512 x 256 MT89L86 512 x 256 MT89L86 512 x 256 MT89L86 512 x 256 8 streams @2.048 mb/s 8 streams @2.048 mb/s 8 streams @2.048 mb/s 8 streams @2.048 mb/s out out 16 16 8 8 8 8
MT89L86 advance information 22 figure 14 - interfacing the 3.3v MT89L86 to the 8051 microcontroller res r s t 8051 ad0 ad1 ad2 ad3 ad4 ad5 ad6 ad7 ale r d w r d ck q p r d ck q p r d ck q p r 8 8 c s mta MT89L86 address decode latch latch le o e o e le ad0 ad1 ad2 ad3 ad4 ad5 ad6 ad7 ale r d w r c s d t a rd mta d t a m t a ad0-ad7 MT89L86 d t a res r c l r d lwr MT89L86 access dt a goes low. when writing to the MT89L86, one write operation is suf?ient. however, when reading from the MT89L86, two read operations with the same address are required, with the second being valid.
advance information MT89L86 23 * exceeding these values may cause permanent damage. functional operation under these conditions is not implied. typical ?ures are at 25 c and are for design aid only: not guaranteed and not subject to production testing. typical ?ures are at 25 c and are for design aid only: not guaranteed and not subject to production testing. absolute maximum ratings* parameter symbol min max units 1 supply voltage -0.3 5.0 v 2 voltage on any i/o pin (except supply pins) v o v ss -0.3 v dd +0.3 v 3 current at digital outputs i o 20 ma 4 storage temperature t s -55 +125 c 5 package power dissipation p d 1w recommended operating conditions - voltages are with respect to ground (v ss ) unless otherwise stated. characteristics sym min typ max units test conditions 1 operating temperature t op -40 25 +85 c 2 positive supply v dd 3.0 3.3 3.6 v 3 input high voltage v ih 0.7v dd v dd v 4 input high voltage on 5v tolerant inputs v ih 5.5 v 5 input low voltage v il v ss 0.3v dd v dc electrical characteristics - voltages are with respect to ground (v ss ) unless otherwise stated. characteristics sym min typ max units test conditions 1 i n p u t s supply current i dd 6 10 ma outputs unloaded 2 input high voltage v ih 0.7v dd v 3 input low voltage v il 0.3v dd v 4 input leakage i il 5 av i between v ss and v dd 5 input pin capacitance c i 10 pf 6 o u t p u t s output high voltage v oh 0.8v dd vi oh = 10 ma 7 output high current i oh 10 ma sourcing. v oh =2.4v 8 output low voltage v ol 0.4 v i ol = 5 ma 9 output low current i ol 5 ma sinking. v ol = 0.4v 10 high impedance leakage i oz 5 av o between v ss and v dd 11 output pin capacitance c o 10 pf ac electrical characteristics _ timing parameter measurement voltage levels characteristics sym level units test conditions 1 cmos threshold voltage v tt 0.5v dd v 2 cmos rise/fall threshold voltage high v hm 0.7v dd v 3 cmos rise/fall threshold voltage low v lm 0.3v dd v
MT89L86 advance information 24 ? timing is over recommended temperature & power supply voltages (v dd =3v 5%, v ss =0v, t a =?0 to 85 c). typical ?ures are at 25 c and are for design aid only: not guaranteed and not subject to production testing. figure 15 - st-bus timing (clkm bit=0) ac electrical characteristics ? _ st-bus timing (2.048 mb/s) voltages are with respect to ground (vss) unless otherwise stated. characteristics sym min typ max units test conditions 1 frame pulse width t frw 244 ns 2 frame pulse setup time t frs 10 190 ns 3 frame pulse hold time t frh 20 190 ns 4 sto delay active to active t daa 55 ns c l =150 pf 5 sti setup time t stis 20 ns 6 sti hold time t stih 20 ns 7 clock period t clk 200 244 300 ns 8 ck input low t cl 85 122 150 ns 9 ck input high t ch 85 122 150 ns 10 clock rise/fall time t r , t f 10 ns v hm v lm sti t frw t clk t ch t cl t frs t stis t stih t frh ch. 31 bit 0 ch. 0 bit 7 ch. 0 bit 6 ch. 31 bit 0 ch. 0 bit 7 ch. 0 bit 6 ch.0 bit 5 ch. 0 bit 5 t daa v hm v l m v hm v lm v hm v lm fr sto t r t f sti
advance information MT89L86 25 ? timing is over recommended temperature & power supply voltages (v dd =3v 5%, v ss =0v, t a =?0 to 85 c). typical ?ures are at 25 c and are for design aid only: not guaranteed and not subject to production testing. figure 16 - gci timing (clkm bit=0) ac electrical characteristics ? - gci timing (2.048 mb/s) voltages are with respect to ground (vss) unless otherwise stated. characteristics sym min typ max units test conditions 1 clock period t ck 150 244 300 ns 2 pulse width t cl , t ch 73 122 150 ns 3 frame width high t wfh 244 ns 4 frame setup t frs 10 190 ns 5 frame hold t frh 20 190 ns 6 data delay/clock active to active t daa 55 ns c l =150 pf 7 serial input setup t stis 20 ns 8 serial input hold t stih 20 ns 9 clock rise/fall time t r, t f 10 ns v hm v lm st o clk fr clk fr sti/ sto see detail a detail a note: bit 0 identifies the first bit of the gci frame t cl t ch t ck t daa t wfh t frs t frh t stis t stih sti ch. 0 bit 6 ch. 0 bit 7 ch. 0 bit 4 ch. 0 bit 5 ch. 31 bit 0 v hm v lm v hm v lm v hm v lm t r t f
MT89L86 advance information 26 ? timing is over recommended temperature & power supply voltages. typical ?ures are at 25 c and are for design aid only: not guaranteed and not subject to production testing. * high impedance is measured by pulling to the appropriate rail with r l , with timing corrected to cancel time taken to discharge c l . ac electrical characteristics ? - serial streams for st-bus and gci backplanes (2.048 mb/s) characteristics sym min typ max units test conditions 1 o u t p u t s sto0/9 delay - active to high z t saz 55 ns r l =1 k ? * , c l =150 pf 2 sto0/9 delay - high z to active t sza 55 ns c l =150 pf 3 output driver enable delay t oed 50 ns r l =1 k ? * , c l =150 pf 4 csto output delay t xcd 55 ns c l =150 pf figure 17 - serial outputs and external control figure 18 - output driver enable csto clk sto0 to sto9 sto0 to sto9 bit cell boundary (gci) (st-bus) * t saz t sza t xcd * v hm v lm v hm v lm v hm v lm v hm v lm ode sto0 to sto9 v hm v lm v hm v lm t oed * * t oed . ac electrical characteristics - serial streams at 4.096 and 8.192 mb/s (refer to figures 19-24) characteristics sym min typ max units test conditions 1 clock period 4.096mb/s 8.192mb/s t ck 190 110 244 122 300 150 ns ns 2 clock pulse high 4.096mb/s 8.192mb/s t ch 85 50 122 60 150 70 ns ns 3 clock pulse low 4.096mb/s 8.192mb/s t cl 85 50 122 60 150 70 ns ns 4 frame sync setup 4.096mb/s 8.192mb/s t fs 10 10 190 90 ns ns 5 frame sync hold 4.096mb/s 8.192mb/s t fh 20 20 190 90 ns ns
advance information MT89L86 27 * high impedance is measured by pulling to the appropriate rail with r l , with timing corrected to cancel time taken to discharge c l. 6 frame sync width 4.096mb/s 8.192mb/s t fw 244 122 ns ns 7 valid data delay from ck input 4.096mb/s 8.192mb/s t dd 50 45 ns ns c l = 150 pf c l = 150 pf 8 input data setup t ds 5ns 9 input data hold t dh 5ns 10 sto delay from active to high z t az 50 ns c l =150 pf, r l =1 k ? * 11 sto delay from high z to active t za 50 ns c l = 150 pf 12 output drive enable delay t oed 40 ns c l = 50 pf, r l =1 k ? * ac electrical characteristics - serial streams at 4.096 and 8.192 mb/s (refer to figures 19-24) characteristics sym min typ max units test conditions
MT89L86 advance information 28 figure 19 - serial interface timing (clkm bit=1, dmo bit=0) - 4.096 and 8.192 mb/s note: for 8.192 mb/s clock, only the positive polarity frame pulse is accepted by the 3.3v MT89L86. figure 20 - output driver enable for streams at 4.096 and 8.192 mb/s clk (4.096 or 8.192 mhz) fr (positive) sto sti clk (4.096 mhz) fr (negative) sto sti ch. 0 bit 7 high z ch. 0 bit 5 b0 b0 b7 b6 b5 ch. 0 bit 7 ch. 0 bit 5 ch. 0 bit 6 ch. 63 bit 0 b0 b7 b6 b5 t fs t fh t fw t dd t ds t dh t ds t ck t fs t fh t ch t cl t fw t dd t az t za ch. 0 bit 6 ch. 63 or 127 bit 5 v hm v lm v hm v lm v hm v lm v hm v lm v hm v lm v hm v lm v hm v lm v hm v lm t dh v hm v lm v hm v lm ode sto0 to sto9 t oed t oed **
advance information MT89L86 29 figure 21 - rate conversion mode (dmo bit=1) - 4 mb/s to 2 mb/s clk (4.096 mhz) fr (positive) sto sti clk (4.096 mhz) fr (negative) sto sti ch. 0 bit 7 ch. 0 bit 5 ch. 0 bit 6 ch. 63 bit 0 ch. 0 bit 7 ch. 0 bit 6 ch. 31 bit 0 ch. 0 bit 7 ch. 0 bit 6 ch. 31 bit 0 ch. 0 bit 7 ch. 0 bit 5 ch. 0 bit 6 ch. 63 bit 0 t ck t ch t cl t fs t fh t fw t ds t az t za t dd t fs t fh t fw t dd t ds t dh ch. 0 bit 5 high z v hm v hm v hm v lm v hm v lm v hm v lm v hm v lm v hm v lm v hm v lm v hm v lm t dh
MT89L86 advance information 30 figure 22 - rate conversion mode (dmo bit=1) - 2 mb/s to 4 mb/s clk (4.096 mhz) fr (positive) sto sti clk (4.096 mhz) fr (negative) sto sti ch. 0 bit 7 high z ch. 0 bit 5 ch. 0 bit 6 t ck t fs t fh t ch t cl t fw t dd t az ch. 63 bit 0 ch. 0 bit 7 ch. 0 bit 5 ch. 0 bit 6 ch. 63 bit 0 t ds t dh ch. 0 bit 7 ch. 0 bit 6 ch. 31 bit 0 t fs t fh t dd t ds t dh t fw ch. 0 bit 7 ch. 0 bit 6 ch. 31 bit 0 ch. 0 bit 5 v hm v hm v hm v lm v hm v lm v hm v lm v hm v lm v hm v lm v hm v lm v hm v lm t za
advance information MT89L86 31 figure 23 - rate conversion mode (dmo bit=1) - 8 mb/s to 2 mb/s figure 24 - rate conversion mode (dmo bit=1) - 2 mb/s to 8 mb/s clk (8.192 mhz) fr sti sto ch. 0 bit 7 ch. 0 bit 5 ch. 0 bit 6 ch. 127 bit 0 ch. 0 bit 7 ch. 31 bit 0 high z ch. 0 bit 6 t ck t ch t cl t fs t fh t fw t ds t dh t dd t az t za v hm v lm v hm v lm v hm v lm v hm v lm clk (8.192 mhz) fr sto sti ch. 0 bit 7 ch. 0 bit 5 ch. 0 bit 6 ch. 127 bit 0 ch. 0 bit 7 ch. 31 bit 0 high z ch. 0 bit 6 t ds t dh v hm v lm v hm v lm v hm v lm v hm v lm t ck t ch t cl t az t za t fs t fh t fw t dd
MT89L86 advance information 32 ? timing is over recommended temperature & power supply voltages. typical ?ures are at 25 c and are for design aid only: not guaranteed and not subject to production testing. * high impedance is measured by pulling to the appropriate rail with r l , with timing corrected to cancel time taken to discharge c l . ac electrical characteristics ? - intel/national- hpc multiplexed bus mode voltages are with respect to ground (vss) unless otherwise stated. characteristics sym min typ max units test conditions 1 ale pulse width t alw 20 ns 2 address setup from ale falling t ads 2ns 3 address hold from ale falling t adh 2ns 4rd active after ale falling t alrd 10 ns 5 data setup from dt a low on read t ddr 0nsc l =150 pf 6cs hold after rd /wr t csrw 0ns 7rd pulse width (fast read) t rw 80 ns 8cs setup from rd t csr 0ns 9 data hold after rd t dhr 10 50 90 ns c l =150 pf,r l =1 k ?? 10 wr pulse width (fast write) t ww 90 ns 11 wr delay after ale falling t alwr 10 ns 12 cs setup from wr t csw 0ns 13 data setup from wr (fast write) t dsw 90 ns 14 valid data delay on write (slow write) t swd 122 ns 15 data hold after wr inactive t dhw 5ns 16 acknowledgment delay: reading data memory reading/writing conn. memories writing to control & mode reg. reading from control & mode reg. t akd 560 62/30 25 52 1220 120/53 65 120 ns ns ns ns c l =150 pf 17 acknowledgment hold time t akh 50 80 ns c l =150 pf,r l =1 k ? *
advance information MT89L86 33 figure 25 - intel/national multiplexed bus timing ale ad0- ad7 cs rd wr dt a t alw t ads t adh data address t alrd t swd t csrw t rw t dhr t ww t dhw t csw t alwr t akd t ddr t akh v hm v lm v hm v lm v hm v lm v hm v lm v hm v lm v hm v lm t dsw t csr
MT89L86 advance information 34 ? timing is over recommended temperature & power supply voltages. typical ?ures are at 25 c and are for design aid only: not guaranteed and not subject to production testing. * high impedance is measured by pulling to the appropriate rail with r l , with timing corrected to cancel time taken to discharge c l . ac electrical characteristics ? - motorola multiplexed bus mode voltages are with respect to ground (vss) unless otherwise stated. characteristics sym min typ max units test conditions 1 as pulse width t asw 80 ns 2 address setup from as falling t ads 2ns 3 address hold from as falling t adh 2ns 4 data setup from dt a low on read t ddr 10 ns c l =150 pf 5cs hold after ds falling t csh 0ns 6cs setup from ds rising t css 0ns 7 data hold after write t dhw 8ns 8 data setup from ds - write (fast write) t dws 25 ns 9 valid data delay on write (slow write) t swd 122 ns 10 r/w setup from ds rising t rws 60 ns 11 r/w hold after ds falling t rwh 9ns 12 data hold after read t dhr 10 50 90 ns c l =150 pf, r l =1 k ?? 13 ds delay after as falling t dsh 10 ns 14 acknowledgment delay: reading data memory reading/writing conn. memories writing control & mode regs. reading from control & mode regs. t akd 560 62/30 25 52 1220 120/53 65 120 ns ns ns ns c l =150 pf 15 acknowledgment hold time t akh 50 80 ns c l =150 pf, r l =1 k ??
advance information MT89L86 35 figure 26 - motorola multiplexed bus timing cs dt a ad7-0 rd ds r/w as address address data data t rwh t rws t asw t dsh t ads t adh t swd t dws t dhw t dhr t css t csh t akd t akh t ddr v hm v lm v hm v lm v hm v lm v hm v lm v hm v lm v hm v lm ad7-0 wr v hm v lm
MT89L86 advance information 36 ? timing is over recommended temperature & power supply voltages . typical ?ures are at 25 c and are for design aid only: not guaranteed and not subject to production testing. * high impedance is measured by pulling to the appropriate rail with r l , with timing corrected to cancel time taken to discharge c l . ac electrical characteristics ? - motorola non-multiplexed bus mode voltages are with respect to ground (vss) unless otherwise stated. characteristics sym min typ max units test conditions 1cs setup from ds rising t css 0ns 2 r/w setup from ds rising t rws 5ns 3 add setup from ds rising t ads 5ns 4cs hold after ds falling t csh 0ns 5 r/w hold after ds falling t rwh 5ns 6 add hold after ds falling t adh 8ns 7 data setup from dt a low on read t ddr 0ns c l =150 pf 8 data hold on read t dhr 10 50 90 ns c l =150 pf, r l =1 k ?? 9 data setup on write (fast write) t dsw 0ns 10 valid data delay on write (slow write) t swd 122 ns 11 data hold on write t dhw 5ns 12 acknowledgment delay: reading data memory reading/writing conn. memories writing control & mode regs. reading from control & mode regs. t akd 560 62/30 25 52 1220 120/53 65 120 ns ns ns ns c l =150 pf 13 acknowledgment hold time t akh 50 80 ns c l =150 pf, r l =1 k ??
advance information MT89L86 37 figure 27- motorola non-multiplexed bus timing ds cs r/w a0-a6 d0-d7 read d0-d7 write dt a t css t rws t ads t csh t rwh t adh valid data t swd t dsw t dhr t ddr t akd t dhw t akh valid data v hm v lm v hm v lm v hm v lm v hm v lm v hm v lm v hm v lm v hm v lm

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