GS4901B Datasheet, PDF (27/95 Pages) Gennum Corporation – SD Clock and Timing Generator with GENLOCK

GS4901B/GS4900B Preliminary Data Sheet
Table 1-3: Output Timing Signals (Continued)
Signal Name
Description
Default Output Pin
USER_1~4
The GS4901B/GS4900B offers four user programmable output signals. Each –
USER signal is controlled by four timing registers and a polarity select bit. The
timing registers define the start and stop times in H pixels and V lines and begin
at address 57h of the host interface (see Section 3.10.3 on page 66).
Each user signal is individually programmable and the polarity, position, and
width of each output may be defined with respect to the H, V, and F output
timings of the device. Each output signal may be programmed in both the
horizontal and vertical dimensions relative to the leading edges of H and V
Sync. If desired, the pulses produced may then be combined with a logical
AND, OR, or XOR function to produce a composite signal (for example, a
horizontal back porch pulse during active lines only, or the active part of lines 15
through 20 for vertical information retrieval). Each output has selectable
polarity.
Please see Section 3.8.3 on page 59 for more detail on the USER_1~4 output
signals.
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