CONEXANT CX25820

Video
Video Surveillance/Security Applications
CX25820/1
PCI-Express Media Bridge
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
digital video interfaces supporting
27 MHz input clock rates and I2S digital
audio interfaces supporting up to 96 kHz
sample rates, for uncompressed video
and audio data respectively. Both devices
are designed for PC-based security
Digital Video Recorders (DVRs)
supporting PAL and NTSC applications.
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).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 CX25820/1 contain 48 GPIO pins,
which maximize flexibility and allow
customization to a variety of applications
and designs. The GPIO pins also 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.
Distinguishing Features
‹
‹
‹
‹
‹
‹
PCIe 1.1 Compliant
Bi-directional BT.656 interfaces to
PCIe
Bi-directional I2S interfaces to PCIe
Programmable Motion Detection
Supports “54 MHz Mode” digital video
data (2 channel byte-interleaved
mode)
48 GPIO pins
Applications
‹
CCIR656 Input/Output
CCIR656 Input/Output
CCIR656 Input/Output
DMA Controller
8 Upstream DMA Channels
8 Downstream DMA Channels
48 x GPIO
SRAM Buffers
‹
SCL & SDA (x3)
Packages
MPU I/F
‹
‹
CCIR656 Input/Output
Clock,
Data[7:0],
(x10)
I 2 S Input/Output
Motion
Detection
PCI Express
TL/DLL
MAC
CCIR656 Input
I 2 S Input/Output
16 - 24 Bit;
32, 44.1,
48, 96
kHz
(x5)
I 2 S Input
CCIR656 Input
CCIR656 Output
233-pin, 14 x 14 mm, fPBGA
256-pin, 28 x 28 mm, eLQFP
I 2 S Input/Output
CCIR656 Input/Output
CCIR656 Input/Output
PAL and NTSC PC-based DVRs
Multi-monitor Displays
System Monitor
Flags & Alarms
I 2 S Output
x1 PCI Express
PHY Interface
CCIR656 Output
Part Number CX25820, CX25821
PCI Express Bus
Description
PCI-Express Media Bridge
The CX25820/1 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
CX25821 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 8 channels of real-time
full D1.
8- Channel DVR Application
8 (Video)
8 (Audio)
CX25828
VID_A
Port A
VID_B
Port C
VID_C
Port E
VID_D
Port G
CX25821
PCIe X1
I2S In
I2S_RECORD
I2S_PLAYBACK
I2S Out
Multi-monitor Display Application
CX25874
CX25874
CX25874
CX25874
CX25821
CX25874
CX25874
CX25874
CX25874
PCIe X1
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Doc# PBR-201499
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