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CX25836

Sideport Video Decoder

Conexant Systems 

Video

Sideport Video Decoders

Integrated Filters

All video inputs have integrated anti-alias filters, eliminating the

need for external filter components. These filters help improve the

video decoding process by removing aliasing artifacts prior to the

digitization process.

Conexant also employs a proprietary method of luma/chroma

separation of the composite video sources. Conceptually similar

to a 4H adaptive chrominance comb filter used for NTSC and

PAL, Conexant performs a slight twist to provide unparalleled

performance. Through the use of adaptive correlation logic, the

resulting combed image provides improved performance over

a standard 4H comb solution. In the case where no correlation

exists between lines, the decoder automatically falls back to the

chrominance band-pass and luma notch filter.

In the case of SECAM, a bell filter is implemented. The net effect

of the various filtering stages results in a high-quality image with

reduced cross-chrominance and cross-luminance artifacts (such

as dot crawl, hanging dots, rainbow effects) and thus restores full

bandwidth to luminance data from composite sources.

Flexible Architecture

With eight programmable input ports and a configurable output

port for 4:2:2 digital, the CX25836/7 can be used to capture

video from TV tuners, DVD players, video cameras, VCRs, game

consoles, or any other sources of composite Y/C or component

(480i) video. The CX25836/7 video inputs can be programmed

for up to eight video sources; a maximum of eight CVBS input

channels. Each of these inputs can be used to support CVBS,

S-Video, or component video inputs. The total number and

configuration of video inputs is user-defined.

Ease of Use

The CX25836/7 requires minimal programming for startup. These

devices are preconfigured in a default mode for development,

verification, and fast prototyping. Additionally, the CX25836/7 can

auto detect all worldwide broadcast video standards.

Internally, the CX25836/7 uses on-chip logic to determine

which video standard is present and reconfigures automatically

so no user intervention is necessary. This is especially useful

in geographic regions where different video standards may

be received on a channel-by-channel basis. However, like the

operation of traditional video decoders where the user chooses a

specific video standard, the automatic detection feature may be

turned off.

XTI

XTO

CVBS1/Y1

CVBS2/Y2

CVBS3/Y3

CVBS4/Y4/SIF1/Pb

CVBS5/C1/SIF2/Pb

CVBS6/C2/SIF3/Pb

CVBS7/C3/SIF4/Pr

CVBS8/C4/SIF5/Pr

Master

Clock

Input

10-Bit

CVBS/

LUMA

ADC

10-Bit

Chroma/

Sound IF

ADC

VBI Data Slicer and Decoder

Video

Decoder -

NTSC, PAL,

SECAM

with 4H

Adaptive

Comb

Filter

Arbitrary

Horizontal

and Vertical

Multi-tap

Polyphase

Scaler

Video

Output

Port:

BT.656,

BT.601,

VIP 2.0

I/O Pin

MUX

2-Wire

Serial

Command

or

VIP Host

I/F

Audio Over -

Sample or

Generic Clock

PIXCLK

VID_DATA[7:0]

VRESET/PRGM3

HRESET/PRGM2

FIELD/PRGM1

DVALID/PRGM0

IR_RX/PRGM5

IR_TX/PRGM6

SER_CLK/HAD[0]

SER_DATA/HAD[1]

CHIP_SEL/VIPCLK

HCTL/PRGM3

IRQ_N/PRGM4

PLL_CLK/PRGM7

CX25836/7 System Block Diagram

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