49 f-bit and v-bit control 1 register – Texas Instruments TVP5147M1PFP User Manual
Page 62
Functional Description
54
SLES140A—March 2007
TVP5147M1PFP
2.11.49 F-bit and V-bit Control 1 Register
Subaddress
69h
Default
00h
7
6
5
4
3
2
1
0
Reserved
VPLL
Adaptive
Reserved
F-bit mode [1:0]
VPLL: VPLL time constant control
0 = VPLL adapts the time constant to the input signal (default)
1 = VPLL time constants are fixed
Adaptive:
0 = Enable F-bit and V-bit adaptation to detected lines per frame (default)
1 = Disable F-bit and V-bit adaptation to detected lines per frame
F-bit mode [1:0]:
00 = Auto mode. If lines per frame is standard decoded F and V bits as per 656 standard from line count
else decode F bit from VSYNC input and set V-bit = 0 (default).
01 = Decode F and V bits from input syncs
10 = Reserved
11 = Always decode F and V bits from line count
This register is used in conjunction with the F-bit and V-bit control 2 register (subaddress 75h) as indicated
below:
Reg 69h
Reg 75h
Mode
Standard LPF
Nonstandard LPF
Bit 1
Bit 0
Bit 1
Bit 0
Mode
F
V
F
V
0
0
0
0
Reserved
Reserved
Reserved
Reserved
Reserved
0
0
0
1
TVP5160
656
656
Toggle
Switch9
0
0
1
0
TVP5160
656
656
Pulse
0
0
0
1
1
Reserved
Reserved
Reserved
Reserved
Reserved
0
1
0
0
Reserved
Reserved
Reserved
Reserved
Reserved
0
1
0
1
656
656
Toggle
Switch9
0
1
1
0
656
656
Pulse
0
0
1
1
1
Reserved
Reserved
Reserved
Reserved
Reserved
1
0
0
0
Reserved
Reserved
Reserved
Reserved
Reserved
1
0
0
1
Reserved
Reserved
Reserved
Reserved
Reserved
1
0
1
0
Reserved
Reserved
Reserved
Reserved
Reserved
1
0
1
1
Reserved
Reserved
Reserved
Reserved
Reserved
1
1
0
0
TVP5146
656
656
Even = 1
Odd = toggle
Switch
1
1
0
1
TVP5146
656
656
Toggle
Switch
1
1
1
0
TVP5146
656
656
Pulse
Switch
1
1
1
1
Reserved
Reserved
Reserved
Reserved
Reserved
656 = ITU-R BT.656 standard
Toggle = Toggles from field to field
Pulse = Pulses low for 1 line prior to field transition
Switch = V bit switches high before the F bit transition and low after the F bit transition
Switch9 = V bit switches high 1 line prior to F bit transition, then low after 9 lines
Reserved = Not used