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| sff.02 1/24/00 ibm42f10snnaa20 IBM42F12SNNAA20 1063/1250mbd small form factor transceiver with signal detect page 1 of 16 features ? international class 1 laser safety certi?ed ? 1063mb/s to 1250mb/s data rates ? (ansi) fibre channel compliant [1] ? (ieee 802.3z/d2) gigabit ethernet compliant [2] ? short wavelength (sw) (distance 550m) ? gigabit electrical serial interface ? serial electrical ? light conversion ? ul & csa approved ? lvttl signal-detect output ? single +3.3v power supply ? low bit error rate (< 10 -12 ) ? high reliability - afr < 0.01 %/khr @50 c applications ? gigabit fibre channel ? gigabit ethernet ? client/server environments ? distributed multi-processing ? fault tolerant applications ? visualization, real-time video, collaboration ? channel extenders, data storage, archiving ? data acquisition description the 1063 / 1250 mb/s serial optical converter (sff-1063/1250n-sw) is an integrated fiber optic transceiver that provides a high-speed serial link at a signaling rate of 1062.5 to 1250 mb/s. the sff- 1063/1250n-sw conforms to the american national standards institutes (ansi) fibre channel, fc-0 specification for short wavelength operation (100- m5-sn-i and 100-m6-sn-i). it also conforms to draft 2 of the ieee 802.3z, 1000base-sx standard [2]. the sff-1063/1250n-sw is ideally suited for fibre channel arbitrated loop (fc-al) and gigabit ether- net applications, but can be used for other serial applications where high data rates are required. this specification applies to a pin through hole (pth) module which has a 2 by 5 electrical connec- tor pin configuration. the sff-1063/1250n-sw uses a short wavelength (850nm) vcsel (vertical cavity surface emitter laser) source. this enables low cost data transmis- sion over optical fibers at distances up to 550m. a 50/125 m m multimode optical fiber, terminated with an industry standard lc connector, is the preferred medium. (a 62.5/125 m m multimode fiber can be substituted with shorter maximum link distances.) encoded (8b/10b) [3], [4], gigabit/sec, serial, differ- ential, pecl signals traverse a connector interfac- ing the sff-1063/1250n-sw to the host card. the serial data modulates the laser and is sent out over the outgoing fiber of a duplex cable. incoming, modulated light is detected by a photore- ceiver mounted in the lc receptacle. the optical signal is converted to an electrical one, amplified and delivered to the host card. this module is designed to work with industry standard 10b seri- alizer/deserializer modules. the sff-1063/1250n-sw is a class 1 laser safe product. the optical power levels, under normal operation, are at eye safe levels. optical fiber cables can be connected and disconnected without shut- ting off the laser transmitter.
ibm42f10snnaa20 IBM42F12SNNAA20 1063/1250mbd small form factor transceiver with signal detect page 2 of 16 sff.02 1/24/00 laser safety compliance requirements the sff-1063/1250n-sw is designed and certified as a class 1 laser product. if the power supply volt- age exceeds 4.0 volts, this may no longer remain a class 1 product. the system using the sff- 1063/1250n-sw must provide power supply over voltage protection that guarantees the supply does not exceed 4.0 volts under all fault conditions. caution: operating the power supply above 4.0v or otherwise operating the sff-1063/1250n-sw in a manner inconsistent with its design and function may result in hazardous radiation exposure, and may be considered an act of modifying or new man- ufacturing of a laser product under us regulations contained in 21 cfr(j) or cenelec regulations contained in en 60825. the person(s) performing such an act is required by law to recertify and reidentify the product in accordance with the provi- sions of 21 cfr(j) for distribution within the united states, and in accordance with provisions of cen- elec en 60825 (or successive regulations) for dis- tribution within the cenelec countries or countries using the iec 825 standard. esd handling take normal static precautions during handling and assembly of the sff-1063/1250n-sw to prevent damage and/or degradation that can be induced by electrostatic discharge. package outline pin assignments pin name type pin # rx ground ground 1 rx power power 2 rx_sd status out 3 rx_dat - signal out 4 rx_dat + signal out 5 tx power power 6 tx ground ground 7 tx_disable control in 8 tx_dat + signal in 9 tx_dat - signal in 10 ordering information product descriptor part number signaling rate wavelength sff-1063/1250n-sw ibm42f10snnaa20 1062.5mb/s 850nm IBM42F12SNNAA20 1250mb/s ibm42f10snnaa20 IBM42F12SNNAA20 1063/1250mbd small form factor transceiver with signal detect sff.02 1/24/00 page 3 of 16 transmit section the input, an ac coupled differential data stream from the host, enters the ac modulation section of the laser driver circuitry where it modulates the output optical intensity of a semiconductor laser. the dc drive main- tains the laser at the correct preset power level. in addition, safety circuits in the dc drive will shut off the laser if a fault is detected. the host must provide the ac coupling for the +tx/-tx lines. a 10nf capacitor is recommended. receive section the incoming modulated optical signal is converted to an electrical signal by the photoreceiver. this electrical signal is then amplified and converted to a differential serial output data stream and delivered to the host. a transition detector detects sufficient ac level of modulated light entering the photoreceiver. this signal is pro- vided to the host as a signal detect status line. the host must provide the ac coupling for the +rx/-rx lines. a 10 nf capacitor is recommended. block diagram post-amp rx_sd and +tx_dat +rx_dat fiber input photoreceiver output fiber fault -rx_dat rx_sd -tx_dat laser ac modulation tx_disable transmit section receive section optical electrical sense dc drive and safety control ibm42f10snnaa20 IBM42F12SNNAA20 1063/1250mbd small form factor transceiver with signal detect page 4 of 16 sff.02 1/24/00 input signal de?nitions levels for the signals described in this section are listed in transmit signal interface on page 8 and control electrical interface on page 9. tx_dat a differential pecl serial data stream is presented to the sff-1063/1250n-sw for transmission onto an optical fiber by modulating the optical output intensity of a laser. tx_disable when high (logic one), the tx_disable signal turns off the power to both the ac and dc laser driver cir- cuits. it will also reset a laser fault if one should hap- pen. when low (logic zero), the laser will be turned on within 1ms if a hard fault is not detected. this sig- nal should be driven with push-pull driver. also, this signal has a pull-down resistor on the transceiver so if the host does not drive this signal the laser will default to the on state. output signal de?nitions levels for the signals described in this section are listed in receive signal interface on page 8 and control electrical interface on page 9. rx_dat the incoming optical signal is converted and repow- ered as a differential, pecl, serial data stream. the receive signal interface table on page 8 gives the voltage levels and timing characteristics for the rx_dat signals. rx_sd the receive signal detect line is high (a logical one) when the incoming modulated light intensity is suf?cient for reliable operation. this is the state for normal operation. the line is low (a logical zero) when incoming modulated light intensity is the below that required to guarantee the correct operation of the link. normally, this only occurs when either the link is unplugged or the companion transceiver is turned off. this signal is normally used by the sys- tem for diagnostic purposes. this signal has a push-pull output driver. timing of tx_disable t_off < 10 m s t_on < 1ms transmitter optical signal tx_disable t_reset > 10 m s timing of rx_sd receive signal detection rx_sd t_sd_off <100 m s t_sd_on <100 m s signal removed optical signal ibm42f10snnaa20 IBM42F12SNNAA20 1063/1250mbd small form factor transceiver with signal detect sff.02 1/24/00 page 5 of 16 operation resetting a laser fault resetting a laser fault by toggling the tx_disable input will permit the sff-1063/1250n-sw to attempt to power on the laser following a fault condition. continuous resetting and repowering of the laser under a hard fault condition could cause a series of optical pulses with sufficient energy to violate laser safety standards. to alleviate this possibility, the sff-1063/1250n- sw will turn off the laser if a second fault is detected within 25ms of the laser powering on. this lock is cleared during each power on cycle. please refer to the timing diagrams below. initialization timings t_init < 300ms vcc > 3.15v tx_disable optical transmit signal sff-1063/1250n-sw with tx_disable de-asserted sff-1063/1250n-sw with tx_disable asserted t_init < 300ms vcc > 3.15v tx_disable optical transmit signal 1 0 fault condition recovery timings occurrence optical power t_reset >10 m s tx_disable t_init* <300ms *only if the fault is transient t_reset >10 m s t_init* <300ms *only if the fault is transient t_fault of transmitter safety fault occurrence optical power tx_disable of transmitter safety fault <100 m s unsuccessful recovery from a transmitter safety fault successful recovery from a transmitter safety fault ibm42f10snnaa20 IBM42F12SNNAA20 1063/1250mbd small form factor transceiver with signal detect page 6 of 16 sff.02 1/24/00 link acquisition sequence the following sequence should be followed to get an ibm sff-1063/1250n-sw in full synchronization with a companion card undergoing a similar sequence. it will also work with a single card when using an optical wrap connector. this sequence assumes the use of an industry standard 10b chip. 1. power up the node. the clock to the 10b chip should be running. 2. drive the transmit data lines to 0101010101. (this speeds up the synchronization process and assures that the comma detect line on the ser/des chip will not pulse randomly on the companion card during the remainder of the sequence.) 3. drive the input control lines as follows: a. enable wrap (10b chip): low (will not be changed) b. enable comma detect (10b chip): high (will not be changed) c. loc k to ref erence (10b chip): high 4. after the laser has come on, bring loc k to ref erence low for at least 500 m s. 5. bring the loc k to ref erence signal high. 6. after 2500 bit times (2.4 m s), the link should be in bit synchronization (the internal clocks are aligned to the incoming bit stream), but not yet byte synchronization (the byte is aligned along the same boundary it had when sent from the companion system to the sff prior to serialization). the receive byte clock (10b chip) frequency should now be running at 0.1 times the bit rate and the comma detect line is ready to indicate reception of the comma character. 7. drive the transmit data lines with a k28.5 (byte sync) character. as soon as the 10b chip receives the k28.5 character from the other side of the link, the clocks will align to the byte boundary and all the receive data lines will have valid data. this will be indicated by the activation of the comma detect line. troubleshooting: what if... the laser never comes on: ? verify 3.3 volts on the connector to the sff-1063/1250n-sw and that the module is correctly connected. ? try either unplugging and replugging or powering down the module to reset the fault lock (see resetting a laser fault on page 5). ? verify that tx_disable is low and that it toggles correctly on the connector. ? try another sff-1063/1250n-sw. if it operates correctly then retry the original. if it still fails, it is probably defective. the rx_sd signal remains low: ? verify 3.3 volts on the connector to the sff-1063/1250n-sw and that the module is correctly plugged. ? try using a wrap connector or a simplex jumper to loop the transmitter to the receiver. if the rx_sd line goes low, the source of the optical signal or the link may be defective. use an optical power meter to check this. if the average optical power is within speci?cation (> -17dbm), then the sff-1063/1250n-sw may be faulty. ibm42f10snnaa20 IBM42F12SNNAA20 1063/1250mbd small form factor transceiver with signal detect sff.02 1/24/00 page 7 of 16 absolute maximum ratings symbol parameter min. typical max. unit notes t s storage temperature -40 75 c 1 t sold connector pin temp during soldering 165/5 c/s 1,3 t sold optics temperature during soldering 100/60 c/s 4 rh s relative humidityCstorage 0 95 % 1, 2 t op ambient operating temperature -10 70 c 1 rh op relative humidity operating 8 80 % 1, 2 v cc supply voltage -0.5 4.0 v 1 v i ttl dc input voltage 0 v cc + 0.7 v1 esd ep hbm esd rating to electrical pins 1500 v 5 esd lc hbm esd rating to lc receptacle 12000 v 1. stresses listed may be applied one at a time without causing permanent damage. exposure to these values for extended periods may affect reliability. specification compliance is only defined within specified operating conditions. 2. non-condensing environment. 3. the connector pin temperature can be measured with a thermocouple attached to pin 3 of 2x5 header 4. the optics temperature can be measured with a thermocouple on the device with the cover off. 5. the hbm (human body model) is a 100pf capacitor discharged through a 1.5k w resistor into each pin per mil-std-883c. speci?ed operating conditions symbol parameter min. typical max. unit t op ambient operating temperature 0 70 c v dd t, v dd r supply voltage 3.135 3.3 3.465 v rh op relative humidity operating 8 80 % power supply interface symbol parameter min typical max. unit i total current (@ 3.3v) 120 ma i total current (@ 3.465v) 200 ma ripple & noise 100 mv(pk-pk) ibm42f10snnaa20 IBM42F12SNNAA20 1063/1250mbd small form factor transceiver with signal detect page 8 of 16 sff.02 1/24/00 transmit signal interface (from host to sff-1063/1250n-sw) symbol parameter min max. unit notes v o pecl amplitude 400 2000 mv 1 dj elec-xmit pecl deterministic jitter 0.12 ui 2 tj elec-xmt pecl total jitter 0.25 ui 2 pecl rise/fall 100 350 ps 3 pecl differential skew 20 ps 1. at 100 w , differential peak-to-peak, the figure below shows the simplified circuit schematic for the sff-1063/1250n-sw high- speed differential input lines. note the input data lines require ac coupling capacitors on the host. a 10nf value is recommend ed. 2. deterministic jitter (dj) and total jitter (tj) values are measured according to those de?ned in annex a, fc-ph rev 4.3. jitter values at the output of a transmitter or receiver section assume worst case jitter values at its respective input. the unit interval ( ui) for 1062.5mb/s is 941ps. the ui for 1250mb/s is 800ps. 3. rise and fall times are measured from 20 - 80%, 100 w differential. receive signal interface (from sff-1063/1250n-sw to host) symbol parameter min max. unit note(s) v o pecl amplitude 600 1000 mv 1 dj elec-rcv pecl deterministic jitter 0.36 ui 2 tj elec-rcv pecl total jitter 0.61 ui 2 pecl differential skew 205 ps 1. at 100 w , differential peak-to-peak, the figure below shows the simplified circuit schematic for the sff-1063/1250n-sw high-speed differential output lines. note the output data lines require ac coupling capacitors on the host. a 10nf capacitor is recommended. 2. deterministic jitter (dj) and total jitter (tj) values are measured according to those de?ned in annex a, fc-ph rev 4.3. jitter values at the output of a transmitter or receiver section assume worst case jitter values at its respective input. the unit interval ( ui) for 1062.5mb/s is 941ps. the ui for 1250mb/s is 800ps. v dd 50 w +tx_dat -tx_dat 50 w 3k w 3.8k w 4pf rx_v dd +rx_dat -rx_dat 50 w rx_gnd 50 w 60 w ... ibm42f10snnaa20 IBM42F12SNNAA20 1063/1250mbd small form factor transceiver with signal detect sff.02 1/24/00 page 9 of 16 control electrical interface symbol parameter min max. unit note(s) voltage levels v ol ttl output (from sff-1063/1250n-sw) 0.0 0.50 v 1 v oh v cc -0.5 v cc +0.3 v v il ttl input (to sff-1063/1250n-sw) 0 0.8 v 2 v ih 2.0 v dd t+0.3 v timing characteristics t_off tx_disable (assert time) 10 m s 3 t_on tx_disable (de-assert time) 1 ms 3 t_reset tx_disable (time to start reset) 10 m s 3 t_init initialization time 300 ms 4 t_sd_on rx_sd assert delay 100 m s 5 t_sd_off rx_sd de-assert delay 100 m s 5 1. a 4.7k - 10k w pull-up resistor to host_v cc is required. 2. a 1k w pull-down resistor to gnd is present on the sff-1063/1250n-sw to allow the laser to be active when no input signal is pro- vided on tx_disable. 3. see tx_disable on page 4 and operation on page 5 for timing relationships. 4. see operation on page 5. 5. see rx_sd on page 4 for timing relations. ibm42f10snnaa20 IBM42F12SNNAA20 1063/1250mbd small form factor transceiver with signal detect page 10 of 16 sff.02 1/24/00 optical speci?cations common receiver and transmitter speci?cations symbol parameter min typical max. unit notes opb optical power budget 5.5 db 1 1. this 5.5db optical power budget is a result of the difference between the worst case transmitted launch power and the receive r sensitivity plus 2db power penalty per fibre channel. receiver speci?cations symbol parameter min typical max. unit notes l operating wavelength 770 860 nm received power -17.0 0.0 dbm(avg) 1 rl return loss of receiver 12 db p off rx_sd de-assert (negate) level -27.0 -17.5 dbm(avg) 2 p on rx_sd assert level -17.0 dbm(avg) 2 rx_sd hysteresis 1 db(optical) 2 1. the minimum and maximum values of the average received power in dbm give the input power range to maintain a ber<10 -12 when the data is sampled in the center of the receiver eye. these values take into account power penalties caused by the use of a laser transmitter with a worst-case combination of spectral width, extinction ratio and pulse shape characteristic s. 2. the rx_sd has hysteresis to minimize chatter on the output line. in principle, hysteresis alone does not guarantee chatter- free operation. the sff-1063/1250n-sw, however, presents an rx_sd line without chatter, where chatter is de?ned as a transient response having a voltage level of greater than 0.5 volts (in the case of going from the negate level to the assert level) and of any duration that can be sensed by the host logic. ibm42f10snnaa20 IBM42F12SNNAA20 1063/1250mbd small form factor transceiver with signal detect sff.02 1/24/00 page 11 of 16 transmitter speci?cations symbol parameter min typical max. unit notes l c spectral center wavelength 830 860 nm dl spectral width 0.85 nm(rms) pt launched optical power -9.5 -4.0 dbm(avg) 1 t rise /t fall optical rise/fall time 0.26 ns 2 optical extinction ratio 9 db 3 rin 12 relative intensity noise -117 db/hz 4 eye opening 0.57 ui 5 dj deterministic jitter 0.20 ui 6 cpr coupled power ratio 9 db 7 1. launched optical power is measured at the end of a two meter section of a 50/125m fiber (n.a.=0.20). the maximum and mini- mum of the allowed range of average transmitter power coupled into the fiber are worst case values to account for manufacturing variances, drift due to temperature variations, and aging effects. 2. optical rise time is determined by measuring the 20-80% of average maximum values using an oscilloscope and 4th order bessel thompson ?lter having a 3db bandwidth of 796mhz and then correcting the measurement to the full bandwidth value. optical fall times are measured using a 6ghz photodetector followed by a 22ghz sampling oscilloscope. no corrections due to ?ltering or sys- tem bandwidth limitations are made on the measured value. 3. extinction ratio is the ratio of the average optical power (in db) in a logic level one to the average optical power in a logic level zero measured under fully modulated conditions in the presence of worst case re?ections. 4. rin 12 is the laser noise, integrated over a speci?ed bandwidth, measured relative to average optical power with 12db return loss. see ansi fibre channel speci?cation annex a.5. 5. eye opening is the portion of the bit time where the bit error rate (ber) 10 -12 . the general laser transmitter pulse shape charac- teristics are speci?ed in the form of a mask of the transmitter eye diagram. these characteristics include pulse overshoot, pul se undershoot, and ringing, all of which should be controlled to prevent excessive degradation of the receiver sensitivity. for th e pur- pose of an assessment of the transmit signal, it is important to consider not only the eye opening, but also the overshoot and undershoot limitations. 6. deterministic jitter is measured as the peak-to-peak timing variation of the 50% optical signal crossings when transmitting r epeti- tive k28.5 characters. it is de?ned in fc-ph, version 4.3, clause 3.1.87 as: timing distortions caused by normal circuit effects in the transmission system. deterministic jitter is often subdivided into duty cycle distortion (dcd) caused by propagation differences between the two transitions of a signal and data depen- dent jitter (ddj) caused by the interaction of the limited bandwidth of the transmission system components and the sym- bol sequence. 7. coupled power ratio is the ratio of the average power coupled into a multimode ?ber to the average power coupled into a singl e mode ?ber. this measurement is de?ned in eia/tia-526-14a. ibm42f10snnaa20 IBM42F12SNNAA20 1063/1250mbd small form factor transceiver with signal detect page 12 of 16 sff.02 1/24/00 soldering information the sff comes with a dust plug. the purpose of the dust plug is to keep the optical port clean and can be used during a wave soldering process. the sff module is not washable. any soldering process is allowed as long as it meets the temperature criteria in the absolute maximum ratings table and uses only a no clean flux process. that way, the sff will not get wet any time during the attachment process. optical cable/connector cable speci?cations symbol parameter min typical max. unit notes 50/125 m m cable and connector specifications l length 2 550 m bw bandwidth @ l = 850nm 500 mhz-km m c attenuation @ l = 850nm 3.5 db/km n.a. numerical aperture 0.20 62.5/125 m m cable specifications length 2 250 m bw bandwidth @ l = 850nm 200 mhz-km attenuation @ l = 850nm 3.75 db/km n.a. numerical aperture 0.275 lc optical connector m con nominal attenuation 0.3 0.5 db 1 s con attenuation standard deviation 0.2 db 1 connects/disconnects 250 cycles 1 1. the optical interface connector dimensionally conforms to the industry standard lc type connector documented in jis-5973. a dual keyed lc receptacle mechanically aligns the optical transmission fiber to the sff-1063/1250n-sw. reliability projections parameter symbol max. unit note average failure rate afr 0.0100 %/khr 1 average failure rate afr 0.0195 %/khr 2 1. afr specified over 44 khours at 50 c, with minimum airflow of 100fpm. 2. afr speci?ed over 44 khours at 60 c, with minimum air?ow of 100fpm. ibm42f10snnaa20 IBM42F12SNNAA20 1063/1250mbd small form factor transceiver with signal detect sff.02 1/24/00 page 13 of 16 mechanical description the sff-1063/1250n-sw is intended to be used on a host card having a thickness of 0.062" to 0.100. the host card footprint with essential keepouts and drill holes is shown in host card footprint on page 14. card layout 28.45 (1) 15.79 4.57 (1) 17.78 7.11 (1) 13.34 (1) 10.16 (4x) 1.78 0.36 m ab c m c (2x) 1.07 + 0 - 0.1 b 0.36 m ab m c (10x) 0.508 0.05 (4x) 1 1 0.36 m ab m c * noted pins are for signal ground. * bottom view top view a 9.8 max c 3.8 3 typ 13.5 max 49.5 max c tx rx 10 98 76 5 4 3 2 1 13.6 ref 13.97 min 6.8 6.8 9.8 0.25 13.97 min pitch b * unless otherwise noted, all units are millimeters. ibm42f10snnaa20 IBM42F12SNNAA20 1063/1250mbd small form factor transceiver with signal detect page 14 of 16 sff.02 1/24/00 f host card footprint 7.11 13.34 3.56 7.11 17.78 7.59 3 4.57 (4x) 1.78 10 9 8 7 6 5 4 3 2 1 9.59 2 3.08 2 10.16 3 6 15.79 (2x) ? 1.4 0.1 holes for solder posts must be tied to chassis ground (4x) ? 1.4 0.1 holes for signal grounding leads (10x) ? 0.81 0.1 (2x) ? 2.29 max. area for eyelets 13.97 min. pitch (2x) ? 2.29 max. ibm42f10snnaa20 IBM42F12SNNAA20 1063/1250mbd small form factor transceiver with signal detect sff.02 1/24/00 page 15 of 16 references standards 1. american national standards institute inc. (ansi), x3t11, fibre channel-physical and signaling inter- face (fc-ph) . copies of this document may be purchased from: global engineering 15 inverness way east englewood, co 80112-5704 phone: (800) 854-7179 or (303) 792-2181 fax: (303) 792-2192. 2. ieee 802.3z draft 5.0. drafts of this standard are available to members of the standards working commit- tee. for further information see ieee 802.3z public re?ector at stds-802-3-hssg@mail.ieee.org. to be added to the re?ector, send an e-mail to: majordomo@mail.ieee.org containing the line: subscribe stds-802-3-hssg ibm42f10snnaa20 IBM42F12SNNAA20 1063/1250mbd small form factor transceiver with signal detect page 16 of 16 sff.02 1/24/00 revision log date description of modi?cation 1/24/00 initial release (00). ibm42f10snnaa20 IBM42F12SNNAA20 1063/1250mbd small form factor transceiver with signal detect sff.02 1/24/00 page 17 of 16 copyright and disclaimer copyright international business machines corporation 2000. all rights reserved printed in the united states of america, january 2000 the following are trademarks of international business machines corporation in the united states, or other countries, or both. ibm ibm logo other company, product and service names may be trademarks or service marks of others. all information contained in this document is subject to change without notice. the products described in this docu- ment are not intended for use in implantation or other life support applications where malfunction may result in injury or death to persons. the information contained in this document does not affect or change ibm product specifications or warranties. nothing in this document shall operate as an express or implied license or indemnity under the intellec- tual property rights of ibm or third parties. all information contained in this document was obtained in specific environ- ments, and is presented as an illustration. the results obtained in other operating environments may vary. the information contained in this document is provided on an "as is" basis. in no event will ibm be liable for damages arising directly or indirectly from any use of the information contained in this document. ibm microelectronics division 1580 route 52, bldg. 504 hopewell junction, ny 12533-6351 the ibm home page can be found at http://www.ibm.com the ibm microelectronics division home page can be found at http://www.chips.ibm.com sff.02 1/24/00 a |
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