TMC22191 CADEKA [Cadeka Microcircuits LLC.], TMC22191 Datasheet - Page 33

• Manufacturer Part Number: TMC22191
• Description: Digital Video Encoders/Layering Engine
• Manufacturer: CADEKA [Cadeka Microcircuits LLC.]

PRODUCT SPECIFICATION
NTSC Subcarrier
For NTSC encoding, the subcarrier synthesizer frequency
has a simple relationship to the pixel clock period, repeating
over 2 lines: The decimal value is:
This value must be converted to binary and split into four
8-bit registers, FREQM, FREQ2, FREQ3, and FREQL. The
number of pixels/line is:
SYSPH establishes the appropriate phase relationship
between the internal synthesizer and the chroma modulator.
The nominal value for SYSPH is zero.
Other values for SYSPH must be converted to binary and
split into two 8-bit registers, SYSPHM and SYSPHL.
Burst Phase (BURPH) sets up the correct relative NTSC
modulation angle. The value for BURPH is:
This value must be converted to binary and split into two
8-bit registers, BURPHM and BURPHL. The decimal num-
ber 8,192 advances the burst phase by 45 .
Table 13. Standard Subcarrier Parameters
NTSC sqr.
PAL-M sq.
CCIR-601
CCIR-601
CCIR-601
Standard
NTSC 4x
PAL-M 4x
PAL sq.
PAL 15
NTSC
PAL-M
Mpps
Pixels/line = (2/PXCK frequency) (H period)
BURPH = SYSPH + 8,192
pixel
pixel
pixel
PAL
fSC
fSC
FREQ
=
59.94
59.94
59.94
50.00
50.00
50.00
Field
Rate
(Hz)
60
60
60
-----------------------------
pixels/line
455 2
Horizontal
15.734266
15.734266
15.734266
15.625000
15.625000
15.625000
15.750
15,750
15,750
Freq.
(kHz)
2
(MHz)
32
12.27
13.50
14.32
14.75
13.50
15.00
12.50
13.50
14.30
Pixel
Rate
PXCK
(MHz)
Freq.
24.54
27.00
28.64
29.50
27.00
30.00
25.01
27.00
28.60
Sub-carrier
3.57954500
3.57954500
3.57954500
4.43361875
4.43361875
4.43361875
3.57561149
3.57561149
3.57561149
(MHz)
Freq.
BURPHM
27
20
20
20
00
00
00
00
00
00
PAL Subcarrier
The PAL relationship is more complex, repeating only once
in 8 fields (the well-known 25 Hz offset):
This value must be converted to binary and split as described
previously for NTSC.
For PAL, the decimal value for SYSPH is found from:
This value must be converted to binary and split into two
8-bit registers, SYSPHM and SYSPHL. Burst Phase in PAL
is identical to SYSPH. Therefore, the same values for
SYSPHM and SYSPHL must be used for BURPHM and
BURPHL.
PAL-M Subcarrier
BURPHL
SYSPH
SYSPH
FREQ
FREQ
26
00
00
00
00
00
00
00
00
00
SYSPHM
=
=
=
=
25
00
00
00
00
00
00
00
00
00
-----------------------------
-------------------------------------------------- -
pixels/line
FREQ
--------------- -
FREQ
--------------- -
1135 4
Subcarrier Register (hex)
909 4
2
2
17
17
pixels/line
SYSPHL
24
00
00
00
00
00
00
00
00
00
=
=
+
BURPH
BURPH
1 625
2
FREQM
32
4A
4C
4B
23
43
40
54
49
43
40
FREQ2
2
AA
AA
DF
E0
F3
22
00
13
45
10
TMC22091/TMC22191
32
FREQ3
AA
C6
21
F8
00
18
15
00
3F
66
FREQL
D7
20
AB
51
F5
3E
00
19
96
A1
33