GS4910B GENNUM [Gennum Corporation], GS4910B Datasheet - Page 67

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

3.8 Video Timing Generator
3.8.1 10 Field ID Pulse
The internal PCLK signal generated by the clock synthesis circuit is used to
produce horizontal, vertical, and frame based timing output signals.
The signals generated and available to the application layer via the TIMING_OUT
pins are: H Sync, H Blanking, V Sync, V Blanking, F Sync, F Digital, DE, 10FID,
AFS (GS4911B only), and USER_1~4. These signals are defined in
page
signals can be found in the sub-sections below.
When the GS4911B/GS4910B is operating in Genlock mode, the H, V, and F
based output timing signals are synchronized to the H, V, and F reference signals
applied to the inputs by the application layer. The video timing outputs may be
offset from the input reference by programming the Genlock Offset registers
beginning at address 1Bh of the host interface (see
All TIMING_OUT signals have selectable polarity. The default polarities for each
signal are given in the descriptions in
As described in
identification of film to video cadence. It is only generated for 29.97, 30, 59.94, and
60fps formats.
The 10FID pulse is generated on every 5
every 10
By default, the 10FID signal is set HIGH on the leading edge of the H Sync output
for the duration of line 1 of field 1 at the start of the 10 field sequence. This is shown
in
Alternatively, by setting bit 4 of the Video_Control register at address 4Ch of the
host interface, the 10FID output signal may be configured to go HIGH (default
polarity) on the leading edge of the H Sync pulse of line 1 of the first field in the 10
field sequence, and be reset LOW on the leading edge of the H Sync pulse of line
1 of the second field in the 10 field sequence. This is shown in
Horizontal Sync Output
Figure 3-8: Default 10FID Output Timing
36655 - 2
Figure
10FID Output
25. Additional information pertaining to the 10FID, AFS, and USER_1~4
th
3-8.
frame on 59.94 and 60fps formats.
April 2006
Table
1-3, the 10 field ID (10FID) output signal is used in the
Line 1 every n frames where:
n = 5 @ 29.97 fps, 30 fps
n = 10 @ 59.94 fps, 60 fps
Line 1, Frame 1 every 'n' frames
Section 1.5 on page
Total Line
GS4911B/GS4910B Data Sheet
th
frame for 29.97 and 30fps formats, and
Section 3.2.1.1 on page
25.
Figure
Section 1.5 on
3-9.
67 of 113
37).