GS1503B Gennum Corporation, GS1503B Datasheet - Page 26

• Manufacturer Part Number: GS1503B
• Description: Hd Embedded Audio Codec
• Manufacturer: Gennum Corporation

4.5.3 Video Output CRC Insertion
Table 4-11: Register Settings
4.5.4 Illegal Code Re-mapping
Table 4-12: Register Settings
4.5.5 Input Blanking
Name
CRC_INS
Name
EXT_SEL
LIMIT_ON
Description
0: EXTH/EXTF output select
1: EXTH/EXTF input select
Illegal code re-mapping (1: Enabled)
Description
Video line CRC insertion (1: Insertion)
When the CRC_INS bit 4 of Host Interface register 000h is set HIGH, the GS1503B
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.
When LIMIT_ON bit 4 of Host Interface register 008h is set HIGH, input video
words between 000-003 are re-mapped to 004, and values between 3FC-3FF are
re-mapped to 3FB. Valid only when the EXT_SEL bit 3 of Host Interface register
000h is set HIGH.
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 GS1503B video data
stream. If the HBLK_INS bit is set HIGH, any multiplexed audio will be replaced
with blanking codes.
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Address
Address
001
008
000
August 2006
Bit
Bit
3
4
4
GS1503B Data Sheet
Setting
Setting
1
1
1
Default
Default
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1
0
0