參數(shù)資料
型號: GS1582-IBE3
廠商: Gennum Corporation
英文描述: IC,MOT,MC145026P, DIP-16, ENCODER 9 LINE SIMPLEX
中文描述: 多速率的電纜驅(qū)動器,音頻多路復用器和ClockCleaner⑩串行
文件頁數(shù): 51/114頁
文件大?。?/td> 1224K
代理商: GS1582-IBE3
GS1582 Data Sheet
40117 - 1 November 2007
51 of 114
Figure 4-18: ACLK to Data & Control Signal Input Timing
4.7.16 5-frame Sequence Detection
5-frame sequence detection is required for 525-line based standard definition
formats and to embed the Audio Frame Number word in the audio control packets
for synchronous audio in both HD and SD formats.
4.7.16.1 SD Audio Multiplexing
The GS1582 detects the frame sequence that describes the sample distribution for
synchronous audio. This information is used in the generation of the Audio Frame
Number (AFN) field, describing the position of the current frame within the
sequence. AFN values will only be generated for group A if the AFNA_AUTO bit in
the host interface, and for group B if the AFNB_AUTO bit is set.
If the GS1582 is not configured to generate AFN values, the AFN field will be set
to 0 at all times. However, if the core is configured to generate AFN values, the AFN
value will be between 1 and 5, depending on where the given frame lies in the
frame sequence. With a frame rate of 25 Hz, each frame will contain 1920 samples,
and each frame will have an AFN of one (see
Table 4-13
). For a frame rate of 29.97
Hz, 8008 samples are distributed over 5 frames, as shown in
Table 4-14
.
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.
Table 4-12: GS1582 Serial Audio Data Inputs
Parameter
Symbol
Conditions
Min
Typ
Max
Units
Input Data Set-up Time
t
SU
50% levels;
3.3V or 1.8V operation
74
ns
Input Data Hold Time
t
IH
74
ns
ACLK
A_IN_[8/7:2/1]
DATA
Control signal
input
t
SU
t
IH
DATA
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