TMC22X5YA datasheet(4/84 Pages) CADEKA

4 / 84 page

TMC22x5yA

PRODUCT SPECIFICATION

REV. 1.0.0 2/4/03

General Description

The TMC22x5yA digital decoder can be used as a universal

input to digital video processing systems by decoding digital

composite video and transcoding digital component inputs

into a common data format.

The digital comb ﬁlter decoder implements one of sixteen

comb ﬁlter architectures to produce luminance and color dif-

ference component signals which are virtually free of the

cross-color and cross-luminance artifacts associated with

simple bandsplit ﬁlter decoders.

Table 1. TMC22x5yA Decoder Family

Because the cost/performance tradeoff varies among applica-

tions, the TMC22x5yA decoder has been developed as a

family of six parts. They are all assembled in the same

package, and ﬁt the same footprint. The register maps are

identical.

Figure 1. Logic Symbol

The devices come in 8- and 10-bit resolution versions (see

Figure 2 for data alignment between 8- and 10-bit versions).

Within each resolution version there are three models, offer-

ing three-line adaptive comb ﬁltering, two-line adaptive

comb ﬁltering, and simple decoding. The TMC22153A

10-bit three-line comb ﬁlter can be programmed to emulate

any of the other parts. All prototyping can be performed with

this version to evaluate performance tradeoffs, and lower-

cost versions are easily substituted in production.

Input Processor

The digitized video and clocks provided to the decoder can

be either locked to the line frequency or the subcarrier fre-

quency of the digitized waveform, providing broadcast qual-

ity decoding from the NTSC square pixel rate of 12.27 MHz

to the PAL four times subcarrier pixel rate of 17.73 MHz.

Figure 2. Pixel Data Format

Processors), TRS words (D1 multiplexed component sig-

nals), and TRS-ID words (deserialized D2 signals) can be

used to lock the internal horizontal and vertical state

machines to the embedded information. If this information is

not provided, external horizontal and vertical syncs are

required for all line-locked input formats, and are optional

for NTSC inputs locked to four times the subcarrier (4*Fsc).

A simple sync separator is provided for digitized inputs

locked to the subcarrier frequency: the internal sync separa-

tor locks to the mid point of syncs during the vertical ﬁeld

group, then ﬂywheels during the active portion of the ﬁeld.

For this reason, the DHSYNC and DVSYNC operations are

not guaranteed in subcarrier mode.

Adaptive Comb Filter

The line based adaptive comb ﬁlter in the TMC22x5yA adds

or subtracts the high frequency data from three adjacent ﬁeld

lines to produce the average of the high frequency luminance

by canceling the chrominance signals, which in ﬂat ﬁelds of

color are 180 degrees apart. Unfortunately ﬂat ﬁelds of color

are rare and, when vertical transitions in the picture occur,

the output of the comb ﬁlter contains a mixture of both high

frequency luminance and chrominance, at which time the

comb fails. To avoid the comb ﬁlter artifacts that occur when

this happens, three sets of error signals are sent to a user-pro-

grammable lookup table, allowing the output of the comb ﬁl-

ter to be mixed with the output of an internal bandsplit

decoder.

To produce these comb fail error signals, the video on each

of the inputs to the comb ﬁlter is passed through a simple

bandsplit decoder. The low-frequency portion of the signal is

TMC2215yA

TMC2205yA

Function

321321

10-bit Data

✔✔✔

8-bit Data

✔✔✔✔✔✔

D1 Interface

✔✔✔✔✔✔

Line-Locked Mode

✔✔✔✔✔✔

fSC-Locked Mode

✔✔✔✔✔✔

Genlock Mode

✔✔✔✔✔✔

NTSC Frame Comb

✔✔

NTSC/PAL Field Comb ✔✔

3-Line Comb

✔✔

2-Line Comb

✔✔

Line Grab

✔✔

Pixel Grab

✔✔✔✔✔✔

65-22x5yA-02

VIDEOA9-0

BUFFER

LDV

HSYNC

MASTER

TMC22x5yA

Multistandard

Digital

Video

Decoder

CLOCK

VSYNC

R/W

D7-0

A1-0

VIDEOB9-0

G/Y9-0

B/CB9-0

R/CR9-0

FID2-0

AVOUT

DHSYNC

DVSYNC

SER

SET

RESET

SA2-0

SDA

SCL

MSB

LSB

VA9

VB9

G/Y9

B/CB9

R/CR9

VA8

VB8

G/Y8

B/CB8

R/CR8

•••

VA2

VB2

G/Y2

B/CB2

R/CR2

VA1

VB1

G/Y1

B/CB1

R/CR1

VA0

VB0

G/Y0

B/CB0

R/CR0

10 bit

VA9

VB9

G/Y9

B/CB9

R/CR9

VA8

VB8

G/Y8

B/CB8

R/CR8

•••

VA2

VB2

G/Y2

B/CB2

R/CR2

N/C

8 bit

Inputs containing embedded GRS (CADEKA Video Input

TMC22X5YA Datasheet(PDF) 4 Page - Cadeka Microcircuits LLC.

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