GS1503BCVE2 GENNUM [Gennum Corporation], GS1503BCVE2 Datasheet - Page 35

• Manufacturer Part Number: GS1503BCVE2
• Description: HD Embedded Audio CODEC Data Sheet
• Manufacturer: GENNUM [Gennum Corporation]

4.8 Video Switching Line Setting
The video switching point for field 1 and field 2 can be configured via the GS1503B Host
Interface. The SW_LNA[12:0] register is used to configure the video switching line for
field 1, and SW_LNB[12:0] to set video switching line for field 2. In progressive format
video standards, only the SW_LNA[12:0] register is used. The default settings are line 7
for field 1 and line 569 for field 2 as defined in SMPTE 299M.
The GS1503B will not multiplex any audio data packets in the line immediately after the
video switching point. For example, with the default setting of line 7 field 1, there will be
no audio data packets in line 8. The next packets will appear on line 9. Audio control
packets will be multiplexed once per field, two lines after the video switching point (on
line 9, using the previous example). Arbitrary data packets will not be multiplexed in the
two lines following the video switching point .
NOTE: The SMPTE 299M standard defines the video switching point as lines 7 and 569.
If the SW_LNA[12:0] and SW_LNB[12:0] registers are programmed with values other
than lines 7 and 569, the output of the GS1503B is not guaranteed to be compatible with
all HD audio demultiplex systems. With non-SMPTE 299M compliant switch line
settings, the user should avoid inputting a video data stream to the GS1503B, which
already contains embedded audio data and control packets.
For reliable operation, non-SMPTE 299M compliant video data streams with embedded
audio should not be used in conjunction with the GS1503B in Multiplex Mode.
Table 4-27: Register Settings
GS1503B HD Embedded Audio CODEC
Data Sheet
37953 - 1
Name
SW_LNA[12:0]
SW_LNB[12:0]
December 2009
Description
Video Field 1 switching point setting
Video Field 2 switching point setting
Address
004
005
002
003
Bit
4-0
7-0
4-0
7-0
Setting
–
–
Default
569d
7d
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