GS4910B GENNUM [Gennum Corporation], GS4910B Datasheet - Page 71

• Manufacturer Part Number: GS4910B
• Description: HD/SD/Graphics Clock and Timing Generator with GENLOCK
• Manufacturer: GENNUM [Gennum Corporation]

3.8.4 TIMING_OUT Pins
3.8.4.1 Selectable Current Drive and Polarity
The horizontal, vertical, and frame based timing output signals for the selected
video format are available to the application layer via the TIMING_OUT_1 to
TIMING_OUT_8 pins.
Programmable Crosspoint Switch
Each TIMING_OUT pin outputs a default signal as shown in
Alternatively, a crosspoint switch may be programmed via the eight Output_Select
registers of the host interface, allowing the user to select which output signal is
directed to each TIMING_OUT pin (see
may be sent to more than one pin if desired.
Table 3-11
which begin at address 43h of the host interface.
Table 3-11: Crosspoint Select
The current-drive of each timing output pin is also selectable via the Output_Select
registers. The current drive of each TIMING_OUT pin is low by default. However,
it may be set high to accommodate certain applications.
Additionally, the Polarity register of the host interface may be programmed to select
the polarity of each timing output signal.
36655 - 2
*AFS is only available on the GS4911B. The bit setting 1010b will be ignored by the GS4910B.
Output_Select_n Bit Settings
outlines the encoding scheme of the eight Output_Select registers,
April 2006
0000
0001
0010
0011
0100
0101
0110
1000
1001
1010
1011
1100
1101
0111
1110
1111
Section 3.12.3 on page
GS4911B/GS4910B Data Sheet
Output Signal
High Impedance
H Blanking
V Blanking
Reserved
Reserved
USER_1
USER_2
USER_3
USER_4
F Digital
H Sync
V Sync
F Sync
10FID
AFS*
DE
Table
79). Any signal
1-3.
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