TMC2192 datasheet(21/69 Pages) CADEKA

21 / 69 page

PRODUCT SPECIFICATION

TMC2192

REV. 1.0.0 8/13/03

Chrominance Processor

Control registers for this section:

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:

Where the number of pixels/line is:

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):

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

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.

Address

Bit(s)

Name

0x06

7-6

FORMAT

0x06

5-3

MODE

0x07

DDSRST

0x11

DRSSEL

0x18

GLKCTL1

0x18

GLKCTL0

0x3F

GAUSS_BYP

0x40

7-0

FREQL

0x41

7-0

FREQ3

0x42

7-0

FREQ2

0x43

7-0

FREQM

0x44

7-4

SYSPHL

0x45

3-0

SYSPHM

0x46

7-4

BURPHL

0x47

3-0

BURPHM

0x48

7-4

BRSTFULL

0x49

3-0

BRST1

0x4A

7-4

BRST2

FREQx

455 2

⁄

pixels line

⁄

---------------------------

pixels line

⁄

PXCK Frequency

H Period

------------------------------------------

FREQx

1135 4

⁄

()

1 625

⁄

()

pixels line

⁄

---------------------------------------------------

FREQ

909 4

⁄

pixels line

⁄

---------------------------

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