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Fairchild Semiconductor Electronic Components Datasheet

TMC2221 Datasheet

CMOS Programmable Digital Output Correlators

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TMC2220/TMC2221
CMOS Programmable Digital Output Correlators
4 x 32 Bit, 20 MHz; 1 x 128 Bit 20 MHz
.Features
• 20 MHz continuous correlation rate
• Fully programmable masking
• Two's complement or unsigned magnitude correlation
score
• User-programmable reference load multiplexing
• Channel weighting and output formatting (TMC2220)
• Multi-bit, dual-channel or non-coherent (quadrature)
correlation (TMC2220)
• Single +5V power supply
• Low power CMOS construction
• Three-state TTL compatible outputs
• TMC2220 available in 68-pin grid array and 69-pin
plastic PGA packages
• TMC2221 available in a 28-pin CERDIP
Applications
• Signal detection
• Radar signature recognition
• Secure communications
• Robotics/automated assembly
• Automatic test equipment
• Electro-optical navigation
• Pattern and character recognition
• Assembly line inspection
Description
The TMC2220, 20 MHz TTL compatible CMOS correlator
is composed of four separate 1 x 32 correlator modules. The
correlation scores of the four modules are weighted, com-
bined and output on two separate parallel, three-state ports.
Each module contains a 32-bit serial data register, a 32-bit
serial reference preload register, a 32-bit parallel reference
latch and a 32-bit parallel mask latch. Correlation is per-
formed by 32 exclusive-NOR (XNOR) gates. Each XNOR
gate compares one (single bit) reference word. While corre-
lation is being performed between the data and the present
reference, the next reference pattern may be preloaded
through one of two multiplexed input ports. Shorter sam-
pling windows and bipolar correlation are also supported.
Each module outputs a 6-bit binary correlation score. Either
an unsigned (range 0 through 32) or bipolar (range -16
through +16) representation may be selected. The outputs of
each pair of correlator modules is added, with user-selected
weighting factors, producing intermediate correlation scores
which can be combined or output directly to the main or aux-
illiary output ports.
Since the four modules can be cascaded serially or in paral-
lel, the TMC2220 supports numerous single and dual chan-
nel applications involving 1, 2, or 4-bit wide data and
window lengths up to 32, 64, 96 or 128 bits. Multiple devices
can be combined to support large correlation operations.
The TMC2221 combines the four 32-bit modules in series
for a fixed channel configuration of 1-bit by 128. The
reduced complexity and package size of the TMC2221 is
ideal for applications requiring less versatility than the
TMC2220. By making use of the mask function, any size
single channel length of up to 128 bits is possible.
With the TMC2221, the reference word is serially loaded
through the single two-input multiplexed reference port of
the first correlator module. Although the configuration is
fixed, the reference loading process and basic operation for
each module is similar to that of the TMC2220. The outputs
are summed with equal weighting, and the result is output
through the single 8-bit output port. Unsigned magnitude or
two's complement (bipolar) output score may be selected.
Rev. 1.1.1


Fairchild Semiconductor Electronic Components Datasheet

TMC2221 Datasheet

CMOS Programmable Digital Output Correlators

No Preview Available !

TMC2220/TMC2221
TMC2220 Block Diagram
W2-0
TC
AE1
CLK
AI1
123
123
A1 A2
11
A32
M1
M2
LM
LDR1
BX1
BY1
RE2-0
AE2
AI2
LDR2
BX2
BY2
REFERENCE
MUX
AND ENABLE
DECODER
C1-0
AE3
AI3
LDR3
BX3
BY3
MUX
1234
R1 R2
B1 B2
M32
R32
B32
1
COMBINING
MATRIX DECODER
AE4
AI4
LDR4
BX4
BY4
PRODUCT SPECIFICATION
MODULE 1
WEIGHTING
DECODER
PARALLEL
COUNTER 6
2 STAGE
PIPELINE
-16
7
Q1
23
4
Q
AO1
BO1
MODULE 2
Q2
MODULE 3
I3
MODULE 4
I4
65-3640-01
AO2
BO2
COMBINING
10
6
MATRIX
5
DM9-0
MAIN
OEM OUTPUT
PORT
AO3
BO3
8
4 56
DA7-0
I
AUXILIARY
OEA OUTPUT
PORT
AO4
BO4
2


Part Number TMC2221
Description CMOS Programmable Digital Output Correlators
Maker Fairchild Semiconductor
Total Page 24 Pages
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