TMC2192KHC データシートの表示（PDF） - Cadeka Microcircuits LLC.

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TMC2192KHC

10 Bit Encoder

Cadeka Microcircuits LLC. 

PRODUCT SPECIFICATION

TMC2192

Chrominance Processor

Control registers for this section:

Address

0x06

0x06

0x07

0x11

0x18

0x18

0x3F

0x40

0x41

0x42

0x43

0x44

0x45

0x46

0x47

0x48

0x49

0x4A

Bit(s)

7-6

5-3

5

7

6

5

3

7-0

7-0

7-0

7-0

7-4

3-0

7-4

3-0

7-4

3-0

7-4

Name

FORMAT

MODE

DDSRST

DRSSEL

GLKCTL1

GLKCTL0

GAUSS_BYP

FREQL

FREQ3

FREQ2

FREQM

SYSPHL

SYSPHM

BURPHL

BURPHM

BRSTFULL

BRST1

BRST2

Subcarrier Programming

The color subcarrier is produced by an internal 32 bit digital

frequency synthesizer which is completely programmable in

frequency and phase. Separate registers, FREQx, SYSPHx,

BSTPHx, are provided for phase adjustment of the color

burst and of the active video, permitting external delay com-

pensation, color adjustment, etc. FREQx is the subcarrier

phase step per pixel and SYSPHx is phase offset at field 1,

line 1 (line 4 for NTSC), pixel 1.

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 for the subcarrier phase step

is:

FREQx = p----i-x-4--e-5--l-5-s---⁄-⁄--l2--i-n---e- × 232

Where the number of pixels/line is:

pixels ⁄ line = P----X----C----K------F---r--e---q---u---e---n---c--y--

H Period

This value must be converted to binary and split into four 8

bit registers, FREQM, FREQ2, FREQ3, and FREQL.

PAL Subcarrier

The PAL relationship is more complex, repeating only once

in 8 fields (the well-known 25 Hz offset):

FREQx = (---1---1---3---5p---i-⁄-x--4-e--)-l-s--+--⁄---l(-i-1-n---e-⁄--6---2---5----) × 232

This value must be converted to binary and split as described

previously for NTSC. The number of pixels/line is found as

in NTSC.

PAL-M Subcarrier

FREQ = p----i-x-9--e-0--l-9-s---⁄-⁄--l4--i-n---e- × 232

SYSPHx establishes the appropriate phase relationship

between the internal synthesizer and the chroma modulator.

The nominal value for SYSPHx is zero.

Other values for SYSPHx must be converted to binary and

split into two 8 bit registers, SYSPHM and SYSPHL.

Burst Phase (BURPHx) sets up the correct relative NTSC

modulation angle. The value for BURPH is:

BURPHx = SYSPHx

This value must be converted to binary and split into two 8

bit registers, BURPHM and BURPHL.

REV. 1.0.0 8/13/03

21

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