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 I
2
S 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.
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 I
2
S 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
I
2
C interfaces, interrupts, flags for motion
detection, and other features.
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 I
2
S audio to/
from the PCIe bus. The CX25821 adds
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
Surveillance-Specific Features
The CX25820/1 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 CX25820/1 to immediately alert
the host processor of motion via interrupts
over PCIe.
Applications
CCIR656 Input/Output
System Monitor
Flags & Alarms
DMA Controller
8 Upstream DMA Channels
8 Downstream DMA Channels
PAL and NTSC PC-based DVRs
Multi-m
onitor Displays
CCIR656 Input/Output
48 x GPIO
SCL & SDA (x3)
Packages
233-pin, 14 x 14 mm, fPBGA
256-pin, 28 x 28 mm, eLQFP
CCIR656 Input/Output
SRAM Buffers
MPU I/F
CCIR656 Input/Output
Clock,
Data[7:0],
(x10)
I
2
S Input/Output
CCIR656 Input/Output
I
2
S Input/Output
PCI Express
TL/DLL
MAC
16 - 24 Bit;
32, 44.1,
48, 96
kHz
(x5)
CCIR656 Input/Output
Motion
Detection
I S Input/Output
2
CCIR656 Input
I
2
S Input
CCIR656 Input
I
2
S Output
CCIR656 Output
x1 PCI Express
PHY Interface
CCIR656 Output
Part Number CX25820, CX25821
PCI Express Bus
Description
PCI-Express Media Bridge
CONEXANT [ CONEXANT SYSTEMS, INC ]
