TMC22091 datasheet(2/60 Pages) CADEKA

2 / 60 page

TMC22091/TMC22191

PRODUCT SPECIFICATION

Block Diagram

OL4-0

PD23-0

CVBS7-0

BYPASS

KEY

PDC

VVSYNC

VHSYNC

G/R/Y MAP

R/R-Y

LPF

INT

10-bit

D/A

10-bit

D/A

10-bit

D/A

REF.

INT

CLOCK

CONTROL

JTAG

CLOCKS

MICROPROCESSOR

INTERFACE

JTAG TEST

INTERFACE

INT

DIGITAL

SYNC.

GEN.

INTERPOLATION

FILTERS

LPF

R-Y

CHROMA

LUMA

COMPOSITE

27006A

VREF

COMP

RREF

B-Y

B/B-Y

G/Y

B/G/CB

R/B/CR

Data Key

BYPASS and OL4:0 on TMC22191 only.

GHSYNC

GVSYNC

256 x 8 x 3

COLOR

LOOK-UP

TABLE

FORMATTER

MASK, KEY

COMPARATOR

MATRIX

CHROMA

MODULATOR

SYNC,

BLANK

INSERT

VIDEO

SWITCH

SUBCARRIER

SYNTHESIZER

INTER-

POLATOR

4:2:2/4:4:4

Functional Description

The TMC22091 and TMC22191 are totally integrated, fully-

programmable digital video encoders with simultaneous

composite and Y/C (S-VIDEO) outputs. The TMC22x91

video outputs are compatible with SMPTE 170M NTSC,

CCIR Report 624 PAL, PAL-M, and NTSC without pedestal

television standards. No external component selection or

tuning is required.

The encoders accept digital image data at the PD port in one

of several formats, which are matrixed into luminance and

chrominance components. The chrominance signals are

modulated onto a digitally synthesized subcarrier. The lumi-

nance and chrominance signals are separately interpolated to

twice the pixel rate, and converted to analog levels by 10-bit

D/A converters. They are also digitally combined and the

resulting composite signal is output by a third 10-bit D/A

converter. This composite signal may be keyed (pixel rate

switching) with a second composite digital video signal pre-

sented to the encoder.

The output video frames may be internally timed by the

TMC22x91, synchronized with the external frame buffer, or

slaved to the companion Genlocking Video Digitizer

(TMC22071). All operational parameters are fully program-

mable over a standard microprocessor port.

Table 1 shows the key features that distinguish between the

TMC22091 and TMC22191. All of the information pre-

sented in this data sheet applies to both products unless oth-

erwise noted. Statements, paragraphs, tables, and ﬁgures that

apply to only one or two of the encoders have notation speci-

fying the applicable part number.

Timing

The encoder operates from a single clock at twice the system

pixel rate. This frequency may be set between 20 MHz and

36 MHz (pixel rates of 10 Mpps to 18 Mpps). Within this

range are included CCIR-601, D2, and square-pixel formats,

as well as a variety of computer-speciﬁc pixel rates. An array

of programmable timing registers allows the software selec-

tion of all pertinent signal parameters to produce NTSC

(with or without 7.5 IRE pedestal) and PAL, and PAL-M

outputs.

Table 1. Comparing the TMC22x91 Encoders

Input Formatting

The input section accepts a variety of video and graphics for-

mats, including 24-bit GBR and RGB, 15-bit GBR and

RGB, YCBCR422, YCBCR444, and 8-bit color-indexed data

(Figure 1a and 1b).

The input section of the TMC22x91 includes a key compara-

tor which monitors the pixel data port with three independent

8-bit comparators, and invokes a video key when the selected

registers match the incoming data.

Feature

TMC22091

TMC22191

OL4-0 pixel inputs for 30

overlay colors

Yes

Number of video layers

supported

BYPASS input for

bypassing CLUTs

Yes

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