4-channel audio/video decoder with integrated pcie interface CX25854 high quality audio and video decode rs for surveillance applications the CX25854 4-channel audio/video decoder with integrated pcie interface was designed for surveillance applications. th e CX25854 contains four high quality ntsc/pal video decoders with 10-bit a/ds and 5-line comb filtering, to generate the highest quality digital video output with th e lowest possible noise. this creates not only the best image quality for viewing, but enables lower bitrates for compression devices using the output of the CX25854. the video decoders within the CX25854 are optimized to lock to inputs with low signal levels as well as line-locked cameras, both of which are common in surveillance systems. each video decoder may be scaled independently and the CX25854 supports bt.656 as well as a vari ety of other interleaved digital video output formats. the CX25854 also contains four hi gh-quality mono audio a/ds with i 2 s outputs. pcie bridging the CX25854 contains a pcie 1.1 compliant x1 interface. it is ideal for "capture card" applications in systems where four channels of high-quality, uncompressed video must be digitized and transmitted via pcie for viewing, compression, and/or analytics. the CX25854 can downscale digi tal video from 4:2:2 format to 4:1:1, reducing bandwidth requirements from 16 bits per pixel to 12. additionally, the CX25854 supports the bridgi ng of up to four channels of digital video and audio from pcie, and can output these streams over pins in bt.656 or i 2 s-style interfaces, respectively. direct-connection to multi-channel h.264 codecs the CX25854 supports byte, line, or frame-interleaved digital video outputs at 27, 54, or 108 mhz. byte and line interleaved outputs are supported entirely within the CX25854. frame-interleaved outputs requ ire that the CX25854 interface with external ddr2 memory. the CX25854 supports i 2 s and multiplexed i 2 s audio outputs. the CX25854 contains an interface for maxim h.264 codecs that permit the CX25854 to bridge compressed data from maxim devices to the pcie bus. this simplifies the bill of materials (bo m) and reduces costs in pcie systems. part number CX25854 description CX25854 4-channel video/audio decoder with integrated pcie interface distinguishing features ? four high-quality ntsc/pal video decoders: ? anti-alias filters ? 10-bit a/ds ? 5-line comb filtering ? independent scaling ? four mono audio a/ds ? variable sample rates ? i 2 s outputs ? flexible digital video output formats at 27, 54, and 108 mhz ? byte-interleaved ? line-interleaved ? frame-interleaved (requires external ddr2 memory) ? pcie 1.1 x1 interface ? interface to maxim codecs for bridging of compressed data to pcie ? tiling and cascading functions (requires external ddr2 memory) ? programmable motion detection ? 48 gpio pins 4 4
additional features analog video decoders 4x composite ntsc/pal 1 input/decoder 10-bit a/ds 5-line comb filters optimized for low-level inputs and line-locked cameras independently scaleable bt.656/vip2.0 digital video i/o configurable: 4x bt.656 @ 27, 54 and 108 mhz; byte, line, or frame-interleaved x1 pci express phy interface data1[7:0], clk1 pci expr ess bus 4 cvbs inputs luma-based motion detection (x4) pll broadband audio a/ds 4x mono pci express tl/dll/mac dma controller 4 downstream video dmas 4 upstream video dmas audio dmas ddr2 interface (optional) 16-bit data ddr2 required for frame-interleaving and tiling ddr2 memory (optional) digital audio i/o 3x i 2 c master maxim codec host i/f interrupts data2[7:0], clk2 data3[7:0], clk3 data4[7:0], clk4 mux-able i 2 s mux-able i 2 s i 2 c data and control motion and board level interrupts 4 mono/ baseband audio inputs i 2 s 16-bit @ 8, 16, 32, 44.1, or 48 khz multiplexable external crystal distributor/representative information 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-203156 ? 2013 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. there are two variants of the CX25854 offered - one with the external ddr2 interface, and one without the interface. when equipped with ddr2, the CX25854 supports frame-interleaved video outputs, as well as a 2x2 cif tiling mode, in which four cif images are tiled into a single d1 stream. the CX25854 includes programmable motion detection logic, which can trigger flags or pcie interrupts when motion is detected on incoming analog video streams. the CX25854 contains 48 gpio pins, which maximize flexibility and allow customization to a variety of applications and designs. i 2 c interfaces and the maxim interface are supported via gpios. CX25854 block diagram the CX25854-1x (contains ddr2 interface) is o ffered in a 23mm x 23mm, 288 pin fpbga package. the CX25854-2x (no ddr2 interface) is offe red in a 14mm x 14mm, 233 pin fpbga package. conexant product portfolio conexant?s comprehensive product portfoli o includes solutions for imaging, a udio, video, and embedded-modem applications.
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