TMC22152KHC Fairchild Semiconductor, TMC22152KHC Datasheet - Page 4

• Manufacturer Part Number: TMC22152KHC
• Manufacturer: Fairchild Semiconductor

Specifications of TMC22152KHC

• Screening Level: Commercial
• Package Type: MQFP
• Pin Count: 100
• Lead Free Status / RoHS Status: Compliant

TMC22x5y
General Description
The TMC22x5y 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. TMC22x5y Decoder Family
Because the cost/performance tradeoff varies among applica-
tions, the TMC22x5y decoder has been developed as a fam-
ily of six parts. They are all assembled in the same package,
and fit the same footprint. The register maps are identical.
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 TMC22153 10-bit
4
10-bit Data
8-bit Data
D1 Interface
Line-Locked Mode
f
Genlock Mode
Frame-Based Comb
Field-Based Comb
3-Line Comb
2-Line Comb
Line Grab
Pixel Grab
SC
VIDEOA
VIDEOB
-Locked Mode
MASTER
BUFFER
HSYNC
CLOCK
VSYNC
Function
D
LDV
A
R/W
CS
9-0
9-0
7-0
1-0
Figure 1. Logic Symbol
Multistandard
TMC22x5y
Decoder
Digital
Video
3
TMC2215y
65-22x5y-02
2
1
3
TMC2205y
G/Y
B/C
R/C
FID
AVOUT
DHSYNC
DVSYNC
SER
SET
RESET
SA
SDA
SCL
2-0
2
2-0
9-0
B9-0
R9-0
1
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.
Inputs containing embedded GRS (Fairchild Video Input
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 TMC22x5y 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
assumed to be luminance and the high frequency portion is
R/C
R/C
B/C
B/C
G/Y
G/Y
MSB
VA
VB
VA
VB
B9
R9
B9
R9
9
9
9
9
9
9
B/C
B/C
R/C
R/C
G/Y
G/Y
VB
VB
VA
VA
B 8
B 8
R8
R8
8
8
8
8
8
8
Figure 2. Pixel Data Format
···
···
R/C
R/C
B/C
B/C
G/Y
G/Y
VA
VB
VA
VB
B2
B2
R2
R2
2
2
2
2
2
2
R/C
PRODUCT SPECIFICATION
B/C
G/Y
VA
VB
N/C
N/C
N/C
N/C
N/C
B1
R1
1
1
1
R/C
B/C
G/Y
LSB
VB
VA
N/C
N/C
N/C
N/C
N/C
B0
R0
0
0
0
10 bit
8 bit