multi-channel video and audio to pcie bridge the CX25822 multi-channel media bridge device enables bi-directional digital video and audio transfers to a host pc via a pcie x1 interface. the CX25822 contains bt.656/vip2.0 digital video interfaces supporting up to 36 mhz input clock rates and i 2 s digital audio interfaces supporting up to 96 khz sample rates, for uncompressed video and audio data respectively. the CX25822 device is designed for pc-based security digital video recorders (dvrs) supporting 960h applications. flexible architecture with ten bi-directional video interfaces (maximum of eight in either direction) and five bi-directional audio interfaces (maximum of four in either direction), the CX25822 can bridge multiple streams of bt.656/vip2.0 video and i 2 s audio to/ from the pcie bus. the video interfaces may be configured to accept video data in a ?54 mhz mode?, which reduces the number of traces routed on the pcb by interleaving 2 data streams on a single digital video port. the CX25822 contain 48 gpio pins, which maximize flexibility and allow customization to a variety of applications and designs. the gpio pins also support i 2 c interfaces, interrupts, flags for motion detection, and other features. surveillance-specific features the CX25822 contains programmable logic to detect motion on incoming bt.656/vip2.0 streams. the ability to de- tect motion on incoming video streams al- lows the CX25822 to immediately alert the host processor of motion via interrupts over pcie. CX25822 960h pci-express media bridge distinguishing features ? pcie 1.1 compliant ? bi-directional bt.656 interfaces to pcie ? bi-directional i 2 s interfaces to pcie ? programmable motion detection ? supports ?54 mhz mode? digital video data (2 channel byte-interleaved mode) ? 48 gpio pins applications ? 960h pc-based dvrs packages ? 233-pin, 14x14 mm, fpbga ? 256-pin, 28x28 mm, elqfp part number CX25822 description 960h pci-express media bridge video video surveillance/security applications ccir656 input/output 48 x gpio motion detection x1 pci express phy interface clock, data[7:0], (x10) dma controller 8 upstream dma channels 8 downstream dma channels sram buffers ccir656 input/output ccir656 input/output ccir656 input/output ccir656 input/output ccir656 input/output ccir656 input ccir656 input ccir656 output ccir656 output i 2 s input/output pci express tl/dll mac i 2 s input/output i 2 s input/output i 2 s input i 2 s output pci express bus system monitor flags & alarms scl & sda (x3) mpu i/f 16 - 24 bit; 32, 44.1, 48, 96 khz (x5) conexant systems
distributor/representative information the CX25822 can downscale digital video from 4:2:2 format to 4:1:1, reducing the bandwidth from 16 to 12 bits per pixel and permitting additional uncompressed streams to be sent over the pcie bus. when properly configured, the CX25822 and any one of conexant's family of multi-channel video decoders form a high-quality, two-chip pc-dvr solution capable of capturing and bridging up to 4 channels of real-time full 960h. www.conexant.com general information: u.s. and canada: (888) 855-4562 international: 1+ (949) 483-3000 headquarters 4000 macarthur blvd. newport beach, ca 92660 doc# pbr-203127 ? 2012, conexant systems, inc. all rights reserved. conexant and the conexant logo are registered trademarks of conexant systems, inc. all other trademarks are owned by their respective owners. although conexant strives for accuracy in all its publications, this material may contain errors or omissions and is subject to change without notice. this material is provided as is and without any express or implied warranties, including merchant ability, fitness for a particular purpose and non-infringement. conexant shall not be liable for any special, indirect, incidental or consequential damages as a result of its use. vid_a i 2 s_record i 2 s_playback vid_b 8 (video) 8 (audio) cx26824 CX25822 port a port c i 2 s in i 2 s out pcie x 4- channel 960h pc-dvr application conexant systems
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