ADV8003 Hardware Manual
Rev. B, August 2013
255
Function
aux_vic_detected[2:0]
Description
000
Set by register 0x3E
001
240p not active
010
576i not active
011
288p not active
100
480i active
101
240p active
110
576i active
111
288p active
aspect_ratio
, TX2 Main Map,
Address 0xF417[1]
This bit is used to set the aspect ratio of input video. This bit is used to distinguish between CEA-861D video timing codes where aspect
ratio is the only difference.
Function
aspect_ratio
Description
0
4:3
1
16:9
progressive_mode_info[1:0]
, TX2 Main Map,
Address 0xF43F[4:3] (Read Only)
This bit is used to specify additional information for 240p or 288p input formats.
Function
progressive_mode_info
[1:0]
Description
00
Reserved
01
262 total lines per frame for 240p and 312 total lines per frame for 288p
10
263 total lines per frame for 240p and 313 total lines per frame for 288p
11
Reserved for 240p and 314 total lines per frame for 288p
6.10.3.
Pixel Repetition
Pixel repetition is used in HDMI to increase the amount of blanking period available to send packets or to increase the pixel clock to meet
the minimum TMDS clock rate of 25 MHz. The ADV8003 offers three choices for the user to implement pixel repetition in the Tx core.
These choices or modes are described below and can be set via
Automatic mode:
In automatic mode, the ADV8003 uses the audio sampling rate and the detected VIC information as parameters to
decide if pixel repetition is needed to obtain sufficient blanking periods to send the audio. For an I2S input stream, the sampling rate is
always set by the user via the
field
.
In the case of an SPDIF stream, the source of the audio sampling rate information is set via
bit. If the pixel repetition factor is adjusted to meet bandwidth requirements, the detected input VIC may be
different from the VIC sent to the downstream sink. The VIC of the actual video sent across the HDMI link to the downstream sink, and
which is included in the AVI InfoFrame, can be read from the
field.
Manual mode:
In the manual pixel repetition mode, the VIC sent in the AVI InfoFrame needs to be set. The factor between the pixel
clock input to the Tx core and the output TMDS clock frequency must be programmed in the
repetition value sent to the HDMI sink must be programmed in
. Refer to the latest HDMI specification for more
details on valid pixel repetition formats.
Max mode:
The max mode works in the same way as the automatic mode, except that it always selects the highest pixel repetition factor
the Tx core is capable of. This makes the video timing independent of the audio sampling rate. This mode is not typically used.
Содержание ADV8003
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Страница 402: ...ADV8003 Hardware Manual Rev B August 2013 402 APPENDIX D PACKAGE OUTLINE DRAWING Refer to Section 1 4...
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