GS1503 datasheet(45/83 Pages) GENNUM

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2.5 VIDEO DATA PROCESSING

2.5.1 Video Signal Input Detection

The GS1503 will set the VIDEO_DET external pin HIGH

when three consecutive TRS are detected in the input video

signal. Also, the VIDEO_DET bit of Host Interface register

000h is set HIGH.

2.5.2 Video Input CRC Error Detection

The GS1503 will set the CRC_ERR external pin HIGH when

a CRC error is detected in the input video signal. Also, the

CRC_ERR bit 5 of Host Interface register 000h is set HIGH.

The number of CRC errors accumulated in one video frame

can be read form CRC_CNT[11:0] in Host Interface

registers 006h and 007h.

2.5.3 Video Output CRC Insertion

When the CRC_INS bit 4 of Host Interface register 000h is

set HIGH, the GS1503 will re-calculate the video line CRC

words. The re-calculated CRC words are inserted in the

video output signal. When CRC_INS is set LOW, the line

CRC words are not updated and existing CRC words at the

input of the device will be output unchanged.

2.5.4 Input Blanking

When VBLK_INS bit 3 of Host Interface register 008h is set

HIGH, the input video vertical blanking will be set to 040h

for the Luma channel and 200h for the Chroma channel.

When HBLK_INS bit 2 of Host Interface register 008h is set

HIGH, the input video horizontal blanking will be set to 040h

for the Luma channel and 200h for the Chroma channel.

The TRS, line number and CRC words will also be set to

blanking values.

The blanking function is performed at the output of the

GS1503 video data stream. If the HBLK_INS bit is set HIGH,

any embedded audio or control packets will be replaced

with blanking codes. The GS1503 will demultiplex data

contained in the packets, prior to the blanking function, and

output at the corresponding pins.

NAME

DESCRIPTION

ADDRESS

BIT

SETTING

DEFAULT

VIDEO_DET

Video input signal detection (1: Detection)

000

NAME

DESCRIPTION

ADDRESS

BIT

SETTING

DEFAULT

CRC_ERR

Video input signal CRC error detection (1: Detection)

000

CRC_CNT[11:0]

Video input signal CRC error accumulation in 1 video

frame

006

007

3-0

7-0

-0

NAME

DESCRIPTION

ADDRESS

BIT

SETTING

DEFAULT

CRC_INS

Video line CRC insertion (1: Insertion)

000

GS1503 Datasheet(PDF) 45 Page - Gennum Corporation

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