TMC22091/TMC22191
PRODUCT SPECIFICATION
Block Diagram
OL
4-0
BYPASS and OL
4:0
on TMC22191 only.
BYPASS
LPF
INT
G/R/Y MAP
R/R-Y
R-Y
B-Y
256 x 8 x 3
COLOR
LOOK-UP
TABLE
10-bit
INTER-
POLATOR
4:2:2/4:4:4
CHROMA
D/A
CHROMA
MODULATOR
B/G/C
B
FORMATTER
MASK, KEY
COMPARATOR
B/B-Y
G/Y
PD
MATRIX
23-0
R/B/C
R
LPF
INT
Data Key
SYNC,
10-bit
LUMA
D/A
KEY
PDC
BLANK
INSERT
VVSYNC
VHSYNC
GHSYNC
GVSYNC
DIGITAL
SYNC.
GEN.
VIDEO
SWITCH
10-bit
D/A
COMPOSITE
SUBCARRIER
SYNTHESIZER
INT
CVBS
7-0
D/A
REF.
INTERPOLATION
FILTERS
CLOCK
CONTROL
JTAG
V
REF
COMP
R
REF
CLOCKS
MICROPROCESSOR
INTERFACE
JTAG TEST
INTERFACE
27006A
Timing
Functional Description
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.
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.
Table 1. Comparing the TMC22x91 Encoders
Feature
TMC22091 TMC22191
OL pixel inputs for 30
No
Yes
4-0
overlay colors
Number of video layers
supported
2
4
BYPASS input for
bypassing CLUTs
No
Yes
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.
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).
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.
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.
2
CADEKA [ CADEKA MICROCIRCUITS LLC. ]
