GS4910B GENNUM [Gennum Corporation], GS4910B Datasheet - Page 47

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

Table 3-2: Ambiguous Standard Identification
3.5.3 Behaviour on Loss and Re-acquisition of the Reference Signal
NOTE: ‘X’ signifies ‘don’t care.’ The X bit will be ignored when determining which standard to select in each of the 6 groups above.
Number
1
2
3
4
5
6
Standard
1920x1080/60/2:1 interlace
1920x1080/30/PsF
1920x1035/60/2:1 interlace
1920x1080/59.94/2:1 interlace
1920x1080/29.97/PsF
1920x1035/59.94/2:1 interlace
1920x1080/50/2:1 interlace
1920x1080/25/PsF
601 525 / 2:1 interlace
720x486/59.94/2:1 interlace
4fsc 525 / 2:1 interlace
601 - 18MHz 525/2:1 interlace
601 625 / 2:1 interlace
720x576/50/2:1 interlace
Composite PAL 625/2:1/25
601 - 18MHz 625/2:1 interlace
640 x 480 VGA @ 60Hz
720x483/59.94/1:1 progressive
By default, the GS4911B/GS4910B will ignore one missing H pulse on the HSYNC
pin and will continue to operate in Genlock mode (although the LOCK_LOST pin
will temporarily be set HIGH). This behaviour is controlled by the Run_Window bits
of register address 24h.
If there are two consecutive missing H pulses on the HSYNC input pin, the
REF_LOST and LOCK_LOST pins will both go HIGH and the device will enter
Freeze mode. An internal flywheel ensures the selected output clock and timing
signals maintain their previous phase and frequency and continue to operate
without glitches.
The VSYNC and FSYNC signals are not monitored in Genlock mode; loss of signal
on these pins will not affect the operation of the device.
NOTE 1: If the input reference is removed and re-applied, all line-based timing
outputs will be inaccurate for up to one frame for all output standards.
36655 - 2
(27MHz
Clocks)
857.14
800.8
800.8
800.8
1716
1716
1716
1716
1728
1728
1728
1728
800
800
800
960
960
858
H
April 2006
(27MHz
Clocks)
16_H
12800
12800
12800
12813
12813
12813
15360
15360
27456
27456
27456
27456
27648
27648
27648
27648
13714
13728
V (lines)
562.5
562.5
562.5
562.5
562.5
562.5
562.4
562.4
262.5
262.5
262.5
262.5
312.5
312.5
312.5
312.5
525
525
GS4911B/GS4910B Data Sheet
F (lines)
1125
1125
1125
1125
1125
1125
1125
1125
525
525
525
525
625
625
625
625
525
525
Amb_Std_Sel[10:0]
X X X X X X X X X 0 0
X X X X X X X X X 0 1
X X X X X X X X X 1 0
X X X X X X X 0 0 X X
X X X X X X X 0 1 X X
X X X X X X X 1 0 X X
X X X X X 0 0 X X X X
X X X X X 0 1 X X X X
X X X 0 0 X X X X X X
X X X 0 1 X X X X X X
X X X 1 0 X X X X X X
X X X 1 1 X X X X X X
X 0 0 X X X X X X X X
X 0 1 X X X X X X X X
X 1 0 X X X X X X X X
X 1 1 X X X X X X X X
0 X X X X X X X X X X
1 X X X X X X X X X X
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