CX25870/871
Appendix A Scaling and I/0 Timing Register Calculations
Flicker-Free Video Encoder with Ultrascale Technology
Table A-1. Target Video Parameters for Standard Definition TV Output Formats (2 of 2)
Parameter
Description
PAL-
B,D,G,H,I
NTSC-M
NTSC-J
PAL-M
PAL-60
PAL-N
PAL-Nc
2.5
SECAM
2.5
Number of Lines
each for Vertical
Serration,
3
3
3
3
2.5
3
Equalization
NOTE(S):
(1)
Value for PAL-I is 250 ns.
2. ITU-R BT.601 blanking values given in square brackets [].
(3)
Using NTSC line numbering convention from ITU-R BT.470.
Using PAL line numbering convention from ITU-R BT.470.
When programming the subcarrier increment, use relationship of Fsc to Fh as given in ITU-R BT.470 instead of Fsc to Fclk.
(4)
(5)
Table A-2. Key Parameters for Supported Standard Definition Video Output Formats
NTSC-
60Hz
PAL-
BDGHI
Mode
FSC (Hz)
NTSC
PAL-N
PAL-Nc
PAL-M
PAL-60
3,579,545
5.3 µs
3,579,545 4,433,618.75
4,433,618.75
5.60 µs
3,582,056.25
5.60 µs
3,575,611.88
5.80 µs
4,433,619.49
5.60 µs
Burst Start
Burst End
5.3 µs
5.60 µs
7.85 µs
4.70 µs
7.82 µs
4.70 µs
7.82 µs
4.70 µs
7.85 µs
8.11 µs
8.32 µs
7.85 µs
HSYNC
Width(1)
4.70 µs
4.70 µs
4.70 µs
4.70 µs
HSYNC
Frequency(1)
63.555 µs
64 µs
64 µs
64 µs
64 µs
63.555 µs
64 µs
Active Begin 9.40 µs
9.40 µs
10.5 µs
9.40 µs
10.5 µs
9.40 µs
10.5 µs
Image Center 35.667 µs
35.667 µs 36.407 µs
1.50 µs 1.50 µs
35.667 µs
1.50 µs
36.407 µs
1.50 µs
35.667 µs
1.50 µs
36.407 µs
1.50 µs
Blank Begin to 1.50 µs
HSYNC(1)
NOTE(S):
(1)
HSYNC in this table refers to the analog horizontal synchronization pulse that starts every scan line.
Table A-3. Constant Values Dependent on Encoding Mode
Interlaced
NonInterlaced
Modes
PAL
NTSC
PAL
NTSC
ALO
TLO
ATO
TTO
288
243
288
312
243
312.5
262.5
262
52.0 µs
64.0 µs
52.65556 µs
63.55556 µs
52.0 µs
64.0 µs
52.65556 µs
63.55556 µs
100381B
Conexant
A-3
CONEXANT [ CONEXANT SYSTEMS, INC ]
