TMC22X5YA datasheet(52/84 Pages) CADEKA

52 / 84 page

TMC22x5yA

PRODUCT SPECIFICATION

REV. 1.0.0 2/4/03

For PAL comb ﬁlters the LYE, LME, and LPE errors signals

are always selected by default. In this way the error signals

into the XLUT always represent the comb ﬁlter being imple-

mented. The resolution of the error signals selected is con-

trolled by the XIP[1:0] register bits as shown in Table 6:

XLUT Input Selection. The position of these error signals on

the XLUT input address X[7:0] is also shown.

The selected comb fail signals are translated by the user-

programmed conﬁguration within the 256*5 XLUT into the

mix signal (K) which controls the 30 levels of cross-fade

between the weighted comb ﬁlter and the band split ﬁlters.

The 1 to 31 mix signal is modiﬁed on the input to the cross-

fade to produce a 0 to 32 control signal, as shown in Table 7.

The special function assigned to K = 0 is programmed into

the XSF[1:0] register bits, as shown in Table 8.

Table 8. XLUT Special Function Definitions

The “Flat with notch” selection passes the FLAT input

through onto the luminance channel and selects the notch

ﬁlter, centered at 0.25 of the normalized clock frequency.

This mode is therefore only useful with inputs at 4*Fsc or in

cases when a notch at 0.25 of the normalized clock

frequency is adequate for application.

The XLUT output, is fed through a bypassable low-pass

ﬁlter KLPF to avoid switching between comb and simple

decoders on a pixel by pixel basis. When the special function

is selected (K = 0) the input to the KLPF is held and the ﬁlter

is automatically bypassed. The output of the XLUT can be

externally monitored by reading XOP[4:0] in register 4Bh.

Table 6. XLUT Input Selection

XIP[1:0]

Function

2 bits of phase error (X[7:6]), 3 bits of

chroma (X[5:3]) and luma magnitude error

(X[3:0]).

4 bits of chroma (X[7:4]) and luma

magnitude error (X[3:0]).

3 bits of phase error (X[7:5]), 3 bits of

chroma magnitude error (X[4:2]), and 2

bits of luma magnitude error (X[1:0]).

4 bits of phase error (X[7:4]) and chroma

magnitude error (X[3:0]).

Table 7. XLUT Output Function.

XLUT

OUTPUT

Special function (e.g. luma comb and HPF

on chroma)

0 - 100% Bandsplit

16 - 50% Bandsplit, 50% Comb

32 - 100% Comb

KIP1-0

XLUT special function selection

comb

simple

comb

ﬂat with notch

simple

ﬂat with notch

comb

Table 7. XLUT Output Function. (cont.)

XLUT

OUTPUT

Figure 20. XLUT Input Selection

XLUT

Input

Select

Filter

2:1

MUX

65-22x5y-61

K[4:0]

XFEN

XIP[1:0]

X[7:0]

YERR

PERR

MERR

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