GS4911B Datasheet, PDF (70/113 Pages) Gennum Corporation – HD/SD/Graphics Clock and Timing Generator with GENLOCK

GS4911B/GS4910B Data Sheet
In the case of interlaced output formats, the programmed vertical start and stop
lines refer to the start and stop lines of the generated USER signal on field 1. The
start and stop lines of the USER signal on the even fields will be V_Start - 1 and
V_Stop - 1, respectively.
For example, if VID_STD[5:0] = 3, field 1 will have 263 lines and field 2 will have
262 lines. A user-defined vertical pulse programmed to start on line 12 and stop on
line 17 will start on frame lines 12 and 274, and stop on frame lines 17 and 279.
The designated registers for programming each user signal are located in the host
interface beginning at address 57h. See Section 3.12.3 on page 79.
V_Start
V_Stop
V_Start
V_Stop
AND=0, OR=0, XOR=0 (default)
AND=1
V_Start
V_Stop
V_Start
V_Stop
AND=0, OR=1
AND=0, OR=0, XOR=1
Shading indicates when USER_x signal is active
Figure 3-11: USER Programmable Output Signal
36655 - 2 April 2006
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