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Product Brief Conexant CX25820
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Video Video Surveillance/Security Applications
PCI-Express Media Bridge CX25820/1 Conexant’s portfolio includes a comprehensive suite of semiconductor solutions for broadband communications and the digital home.
Multi-Channel Video and Audio to PCIe Bridge The CX25820/1 multi-channel media bridge devices enable bi-directional digital video and audio transfers to a host PC via a PCIe x1 interface. The CX25820 and CX25821 contain BT.656/VIP2.0 and I2S interfaces for uncompressed video and audio data, respectively. The devices also support bridging of output streams from Maxim CODEC devices. Both devices are designed for PC-based security Digital Video Recorders (DVRs). Flexible Architecture With six bi-directional video interfaces and three bi-directional audio interfaces, the CX25820 can bridge multiple streams of BT.656/VIP2.0 video and I2S audio to/from the PCIe bus. The CX25821 adds four more video interfaces, for a total of ten digital video interfaces (maximum of eight in either direction). The CX25821 also adds two audio interfaces, increasing the total number of I2S interfaces to five (maximum of four in either direction).
Distinguishing Features • PCIe 1.1 Compliant
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. In
• Bi-directional BT.656 interfaces to PCIe
addition to support for the BT.656/VIP2.0 uncompressed video standards,
• Bi-directional I2S interfaces to PCIe
bi-directional video interfaces on the CX25820/1 may be configured to
• Connects directly to Maxim CODECs
interface to Maxim compression CODECs, for efficient transfer of H.264 compressed data from the device to the host processor. The CX25820/1 devices may also be configured in a “Data-Pump” mode, where generic 8- or 16-bit data may be driven out of the video interface pins.
• Programmable Motion Detection • Supports “54 MHz Mode” digital video data
The CX25820/1 contain 48 GPIO pins, which maximize flexibility and allow
• 8- or 16-bit “Data-Pump Mode” allows host to drive generic data to devices on card
customization to a variety of applications and designs. The GPIO pins also
• 48 GPIO pins
support I2C interfaces, interrupts, flags for motion detection, and other features. Surveillance-Specific Features The CX25820/1 contains programmable logic to detect motion on incoming BT.656/VIP2.0 streams. The ability to detect motion on incoming video streams allows the CX25820/1 to immediately alert the host processor of motion via interrupts over PCIe.
Part Number CX25820, CX25821 Description
PCI-Express Media Bridge
Video Video Surveillance/Security Applications
The CX25820/1 can downscale digital video from 4:2:2 format to
When properly configured, Conexant’s CX25821 and CX25853
4:1:1, reducing the bandwidth from 16 to 12 bits per pixel and
(8-channel video decoder) form a high-quality, two chip PC-DVR
permitting additional uncompressed streams to be sent over the
solution capable of capturing and bridging 8 channels of real-time,
PCIe bus.
full D1 video to the host, with support for playback of 2 NTSC/ PAL video channels from the host.
CCIR656 Input/Output Maxim #1A Interface CCIR656 Input/Output Maxim #1B Interface CCIR656 Input/Output Maxim #1C Interface
Clock, Data[7:0], Start, Valid (x10)
System Monitor Flags & Alarms DMA Controller
48 x GPIO
8 Upstream DMA Channels 8 Downstream DMA Channels
SRAM Buffers
MPU I/F
CCIR656 Input/Output Maxim #2A Interface
I2S Input/Output
CCIR656 Input/Output Maxim #2B Interface
I2S Input/Output
CCIR656 Input/Output Maxim #2C Interface
Motion Detection
PCI Express TL/DLL MAC
CCIR656 Input
2S
I
Input/Output
16 - 24 Bit; 32, 44.1, 48, 96 KHz (x5)
I2S Input
CCIR656 Input
CCIR656 Output
SCL & SDA (x3)
I2S Output x1 PCI Express PHY Interface
CCIR656 Output
PCI Express Bus CX25821 Block Diagram The CX25820 and CX25821 are offered in pin compatible, 14mm X 14mm, 233 pin fpBGA packages.
Conexant Product Portfolio Conexant’s comprehensive product portfolio includes solutions for imaging, audio, and video applications, and analog modems that enable costeffective Internet access. The company’s broadband access products include end-to-end solutions for xDSL networks, and PON solutions for fiber optic applications.
© 2007 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 MerChANTABIlITy, 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.
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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-201499
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