參數(shù)資料
型號(hào): GS4911B
廠商: Gennum Corporation
英文描述: HD/SD/Graphics Clock and Timing Generator with GENLOCK
中文描述: 高清/標(biāo)清/圖形時(shí)鐘和定時(shí)發(fā)生器鎖相
文件頁數(shù): 57/113頁
文件大?。?/td> 1017K
代理商: GS4911B
GS4911B/GS4910B Data Sheet
36655 - 2
April 2006
57 of 113
To genlock the audio clock to the video clock, the user must lock the fundamental
sampling frequency (f
s
) to the frequency of the output video clock (f
out
). This is
accomplished by programming the set of integers (A_Feedback_Divide,
A_Reference_Divide) in the equation:
where:
f
s
= the fundamental audio sampling frequency
f
out
= output video clock frequency
A_Feedback_Divide = numerator of the divide ratio (host register 3Bh-3Ch)
A_Reference_Divide = denominator of the divide ratio (host register 3Dh-3Eh)
n = an integer constant
The integer constant, n, will depend on the fundamental audio sampling frequency.
It will be one of the three values as defined in
Table 3-5
.
Before programming A_Feedback_Divide and A_Reference_Divide, the
numerator and denominator must be reduced to their lowest factors.
For example, to manually genlock a custom audio clock with a fundamental
sampling frequency of 42kHz to a 27MHz video clock, the following calculations are
necessary:
n = 1024
Therefore, program A_Feedback_Divide = 1792 and A_Reference_Divide = 1125.
Note that n=1024 when programming a custom audio clock (see
Section 3.9.2 on
page 73
).
Table 3-5: Integer Constant Value
ASR_SEL[2:0]=100b
Enable_384fs = 0
Value of constant (n)
NO
X
3072
YES
YES
1024
YES
NO
1536
NOTES:
1. Enable_384fs corresponds to bit 5 of address 31h of the host interface. It is LOW by default.
2. ‘X’ signifies ‘don’t care.’ This bit will be ignored when determining n.
A_Reference_Divide
A_Feedback_Divide
n
f
s
f
out
-------
×
=
A_Reference_Divide
A_Feedback_Divide
1024
27000000
---42000
×
27000
43008
1125
1792
=
=
=
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