TMC22X5YA datasheet(23/84 Pages) CADEKA

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PRODUCT SPECIFICATION

TMC22x5yA

REV. 1.0.0 2/4/03

Control Register Deﬁnitions (continued)

Comb Filter Control (0F)

76543210

Reserved

CAT

DCES

IPCF

YCCOMP

SYNC

Reg

Bit

Name

Description

Reserved

Reserved, set to zero.

6-5

CAT

Adaption threshold. Fixes threshold at which different comb filters are selected.

DCES

D1 CBCR error signal. When set LOW for D1 chroma comb filters:

a) In 3 line comb filter architectures, the magnitude error between the component

data for that pixel selects the 3 line comb or adapts to a

2 line comb. On a “CB pixel” the error signal selected on pixel (x+4) is sent to

the XLUT with the magnitude difference between “CR pixels” on the same pair

of lines, but from pixel (x+3). Likewise on a “CR pixel” the error signal selected

on pixel (x+5) is sent to the XLUT with the magnitude difference between “CB

pixels” on the same lines but from pixel (x+4).

b) In 2 line comb filters the magnitude differences between the same pair of lines

is always sent to the XLUT, On a “CB pixel” the error from the preceding “CR

pixel” is used and on a “CR pixel” the preceding “CB pixel” would be used.

When set HIGH for D1 chroma filters:

This is used for 3 line comb filter architecture that are inhibited from adapting to 2

line comb filter architectures. The input to the XLUT is the magnitude error in CR

between (0H & 1H) and (1H & 2H) on “CR pixels” and the magnitude error

between (0H & 1H) and (1H & 2H) on “CB pixels”.

3-2

IPCF

Comb filter input select. Selects primary inputs to the comb filter.

YCCOMP

YC or Composite input select. Selects YC inputs when HIGH and composite

inputs when LOW.

SYNC

Sync processor select. The syncs are obtained by a LPF when HIGH and by the

comb filter when LOW.

Sync Pulse Generator (10)

76543210

STS7

STS6

STS5

STS4

STS3

STS2

STS1

STS0

Reg

Bit

Name

Description

7-0

STS7-0

Sync to sync 8 lsbs. Bottom 8 bits of the number of pixels between sync

pulses.

5% of max error

15% of max error

25% of max error

50% of max error

IPCF

Function

0 0

0 1

1 0

1 1

Flat video

LPF output

HPF output

Reserved

TMC22X5YA Datasheet(PDF) 23 Page - Cadeka Microcircuits LLC.

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