GS1503 Gennum Corporation, GS1503 Datasheet - Page 18

• Manufacturer Part Number: GS1503
• Description: HD Embedded Audio Codec
• Manufacturer: Gennum Corporation

1.5 VIDEO DATA PROCESSING
1.5.1 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.
Register Settings
1.5.2 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.
Register Settings
1.5.3 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.
Register Settings
CRC_CNT[11:0]
VIDEO_DET
CRC_ERR
CRC_INS
NAME
NAME
NAME
Video input signal detection (1: Detection)
Video line CRC insertion (1: Insertion)
Video input signal CRC error detection (1: Detection)
Video input signal CRC error accumulation in 1 video
frame
DESCRIPTION
DESCRIPTION
DESCRIPTION
18
ADDRESS
ADDRESS
ADDRESS
000
000
000
006
007
BIT
6
BIT
BIT
4
3-0
7-0
5
SETTING
SETTING
SETTING
-
1
-
-
DEFAULT
DEFAULT
DEFAULT
15879 - 1
0
1
0
0