參數(shù)資料
型號: GS1582
廠商: Gennum Corporation
英文描述: IC,MC14490P
中文描述: 多速率的電纜驅(qū)動器,音頻多路復(fù)用器和ClockCleaner⑩串行
文件頁數(shù): 52/114頁
文件大小: 1224K
代理商: GS1582
GS1582 Data Sheet
40117 - 1 November 2007
52 of 114
4.7.16.2 HD Audio Multiplexing
If the ASXA bit of the host interface is set to asynchronous audio, the GS1582 will
set the AFN of the group 1 control packets to zero. The GS1582 will also set the
AFN of the group 1 control packets to zero if the AFNA_AUTO bit in the host
interface is not set. The same relationship holds for the ASXB and AFNB_AUTO
bits for group 2.
The GS1582 will detect video standards with 29.97 and 59.94 frame rates by using
the 5-frame sequence detect block. If a 5-frame sequence is detected, the Audio
Frame Number word in the audio control packets will be embedded with the
running sequence 1 through 5.
The GS1582 will add the offset specified in the AFN_OFS[2:0] host interface field
to the generated AFN. The result will wrap around, leaving the resulting AFN in the
range of 1 through 5.
In cases where each frame has the same number of samples, the Multiplexer will
set the AFN to zero for every frame. These cases are shown in
Table 4-13
. In
cases where each frame has a different number of samples, the sequences shown
in
Table 4-14
are used.
4.7.17 Audio Input Format
The GS1582 accepts two audio input formats, AES/EBU digital audio input and
serial digital audio input, as listed in
Table 4-15
. The serial audio input can be
formatted in the following five modes:
Table 4-13: Frame Rates with AFN = 0
Frame Rate (fps)
Samples per Video Frame
30
1600
25
1920
60
800
24
2000
23.98
2002
Table 4-14: Frame Rates with varying samples per frame
Frame Rate
(fps)
Samples,
AFN = 1
1
Samples,
AFN = 2
1
Samples,
AFN = 3
1
Samples,
AFN = 4
1
Samples,
AFN = 5
1
29.97
1602
1601
1602
1601
1602
59.94
801
800
801
801
801
NOTES:
1. AFNs are assuming AFN_OFS = 0.
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