參數(shù)資料
型號: GS4910B
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/圖形時鐘和定時發(fā)生器鎖相
文件頁數(shù): 54/113頁
文件大?。?/td> 1017K
代理商: GS4910B
GS4911B/GS4910B Data Sheet
36655 - 2
April 2006
54 of 113
3.6.2 Manual Locking Process
Using the host interface, the GS4911B/GS4910B may be manually programmed to
genlock certain video formats and audio clocks that are not automatically
genlocked by the device. The following sections discuss when the user should
manually program the internal video and/or audio genlock block, and how these
blocks are programmed.
3.6.2.1 Programming the Internal Video Genlock Block and Output Line/Frame Reset Registers
The user will be required to manually program the internal video genlock block and
output line/frame reset registers during any of the following situations:
1. The pre-programmed output format and input reference cannot be
automatically genlocked according to the cross-reference genlock table
(
Table 3-4
in
Section 3.6.1 on page 50
).
2. A custom video clock is programmed in the host interface (
Section 3.9.1 on
page 72
).
3. VID_STD[5:0] = 62 and a custom H-based timing output signal is programmed
(see
Section 3.10 on page 74
).
4. VID_STD[5:0] = 62 and a custom reference pulse is applied to HSYNC (see
Section 3.10.1 on page 74
).
Video Genlock Block Host Registers
A simplified version of the GS4911B/GS4910B’s internal video genlock block is
shown in
Figure 3-6
.
Figure 3-6: Internal Video Genlock Block
To genlock the output clock and video timing signals to the input format, the user
must first lock the frequency of the output video clock (f
out
) to the frequency of the
reference pulse on HSYNC (f
Href
). This is accomplished by programming the set of
integers (H_Feedback_Divide, H_Reference_Divide) in the equation:
Internal Video Genlock Block
H_Feedback_Divide
H_Reference_Divide
Phase
Comparator
Clock
Synthesizer
27MHz
HSYNC
f
Href
(
Output Video
Clock
f
out
(
(
(host address 2Ah - 2Bh)
(host address 28h - 29h)
(
H_Reference_Divide
H_Feedback_Divide
f
f
Href
----------
=
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