TMC22151AKHC CADEKA [Cadeka Microcircuits LLC.], TMC22151AKHC Datasheet - Page 61

• Manufacturer Part Number: TMC22151AKHC
• Description: Multistandard Digital Video Decoder Three-Line Adaptive Comb Decoder Family, 8 & 10 bit
• Manufacturer: CADEKA [Cadeka Microcircuits LLC.]

PRODUCT SPECIFICATION
Table 20. Table of Line Idents, LID[4:0]
Timing Parameters
Subcarrier Programming
The color subcarrier is produced by an internal 28 bit Direct
Digital Synthesizer (DDS) which is phase locked to the burst
signal of the digitized video input. The nominal frequency is
programmed into the DDS as follows:
FREQ = (number of subcarrier cycles per line / number of
pixels per line) * 2^28
An example would be NTSC subcarrier mode
FREQ = (227.5 / 910) * 2^28 = 4000000 hex
Horizontal Timing
The horizontal video line is broken down into four horizontal
timing parameters.
REV. 1.0.0 2/4/03
STB
260 & 261
263 - 307
Line no:
262
308
309
310
311
312
BTV
LID
10
11
12
13
14
15
16
17
4-0
Figure 27. Horizontal Timing
(cont.)
STS
AV
STS: The number of pixels between sync pulses
STB: The number of pixels between the nominal mid point
of sync and the start of the 16 pixel burst gate. This value is
modified depending upon the mode of operation.
Table 21. Timing Offsets
BTV: The number of pixels between the start of the 16 pixel
burst gate and the nominal start of active video.
AV: The number of active pixels in the active video line.
The difference between the sum of STB+BTV+AV sub-
tracted from STS provides the nominal front porch.
Horizontal and Vertical Timing Parameters
When external horizontal and vertical syncs are provided the
timing shown in Figure 28 is required to synchronize the
internal state machines to beginning of a field (3, 5, or 7).
For field 2 (4, 6, or 8) the falling edge of VSYNC must occur
at least 2 clock periods but not more than (H-2) clock periods
after the falling edge of HSYNC, where H is the total num-
ber of pixels in an active video line.
Standard
NTSC
PAL
x
x
x
x
Line locked
Subcarrier
D2 mode
D2 mode
D1 mode
Genlock
Mode
Offset required
65-22x5y-68
+12
-22
-12
TMC22x5yA
-8
-8
-8
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