Fairchild Semiconductor TMC2250AX3 Datasheet
www.fairchildsemi.com
REV. 1.0.2 10/25/00
Features
• Four user-selectable filtering and transformation
functions:
– Triple dot product (3 x 3) matrix multiply
– Cascadeable 9-tap systolic FIR filter
– Cascadeable 3 x 3-pixel image convolver
– Cascadeable 4 x 2-pixel image convolver
• 50 MHz (20ns) pipelined throughput
• 12-bit input and output data, 10-bit coefficients
• 6-bit cascade input and output ports in all filter modes
• Onboard coefficient storage, with three-cycle updating of
all nine coefficients
Applications
• Image filtering and manipulation
• Video effects generation
• Video standards conversion and encoding/decoding
• Three-dimensional image manipulation
• Medical image processing
• Edge detection for object recognition
• FIR filtering for communications systems
Description
The TMC2250A is a flexible high-performance nine-multiplier
array VLSI circuit which can execute a cascadeable 9-tap
FIR filter, a cascadeable 4 x 2 or 3 x 3-pixel image convolution, or a 3 x 3 color space conversion. All configurations
offer throughput at up to the maximum guaranteed 50 MHz
clock rate with 12-bit data and 10-bit coefficients. All inputs
and outputs are registered on the rising edges of the clock.
The 3 x 3 matrix multiply or color conversion configuration
can perform video standard conversion (YIQ or YUV to
RGB, etc.) or three-dimensional perspective translation at
real-time video rates.
The 9-tap FIR filter configuration, useful in Video, Telecommunications, and Signal Processing, features a 16-bit cascade
input to allow construction of longer filters.
The cascadeable 3 x 3 and 4 x 2-pixel image convolver functions allow the user to perform numerous image processing
functions, including static filters and edge detectors. The 16-bit
cascade input port facilitates two-chip 50 MHz cubic convolution (4 x 4-pixel kernel).
The TMC2250A is fabricated in a sub-micron CMOS process
and operates at clock speeds of up to 50 MHz over the full
commercial (0°C to 70°C) temperature and supply voltage
ranges. It is available in 120-pin Plastic Pin Grid Array
(PPGA) packages, 120-lead Ceramic Pin Grid Array package (CPGA), 120-lead PQFP to PPGA package (MPGA) and
120-lead Plastic Quad FlatPack (PQFP). All input and output
signals are TTL compatible.
TMC2250A
Matrix Multiplier
12 x 10 bit, 50 MHz
PRODUCT SPECIFICATION TMC2250A
2
REV. 1.0.2 10/25/00
Functional Description
The TMC2250A is a nine-multiplier array with the internal bus
structure and summing adders needed to implement a 3 x 3
matrix multiplier (triple dot product) a cascadeable 9-tap FIR
filter, a 3 x 3-pixel convolver, or a 4 x 2-pixel convolver all in
one monolithic circuit. With a 50MHz guaranteed maximum
clock rate, this device offers video and imaging system
designers a single-chip solution to numerous common image
and signal-processing problems.
The three data input ports (A, B, C) accept 12-bit two's complement integer data, which is also the format for the output
ports (X, Y, Z) in the matrix multiply mode (Mode 00). In the
filter configurations (Modes 01, 10, and 11) the cascade ports
assume 12-bit integer, 4-bit fractional two's complement data
on both input and output. The coefficient input ports (KA,
KB, KC) are always 10-bit two's complement fractional.
Table 1 details the bit weighting of the input and output data
in all configurations.
Operating Modes
The TMC2250A can implement four different digital filter
architectures. Upon selection of the desired function by the
user (MODE
1-0
), the device reconfigures its internal data
paths and input and output buses appropriately. The output
ports (XC, YC and ZC) are configured in all filter modes a
16-bit Cascade In and Cascade Out ports so that multiple
devices can be connected to build larger filters. These modes
are described individually below. The I/O function configurations for all four modes are shown in Table 1.
Definitions
The calculations performed by the TMC2250A in each mode
are also shown below, utilizing the following notation:
A(1), B(5), C(2), CASIN(3)
Indicates the data word presented to that input port during
the specified clock rising edge(x). Applies to all input ports
A
11-0
, B
11-0
, C
11-0
, and CASIN
15-0
.
KA1(1), KB3(4)
Indicates coefficient data stored in the specified one of the
nine onboard coefficient registers KA1 through KC3, as
shown in the block diagram for that mode, input during or
before the specified clock rising edge (x).
X(1), Y(4), Z(6), CASOUT (6)
Indicated data available at that output port t
DO
after that
specified clock rising edge (x). Applies to all output ports
X
11-0
, Y
11-0
, Z
11-0
, and CASOUT
15-0
.
Numeric Format
Table 2 shows the binary weightings of the input and output
ports of the TMC2250A. Although the internal sums of products could grow to 23 bits, in the matrix multiply mode
(Mode 00) the outputs X, Y and Z are rounded to yield 12-bit
integer words. Thus the output format is identical to the input
data format. In the filter configurations (Modes 01, 10, and
11) the cascade output is always half-LSB rounded to 16
bits, specifically 12 integer bits and 4 fractional guard bits,
with no overflow "headroom". The user is of course free to
half-LSB round the output word to any size less than 16 bits
by forcing a 1 into the bit position of the cascade input
immediately below the desired LSB. In all modes, bit
weighting is easily adjusted if desired by applying the same
scaling correction factor to both input and output data words.
If the coefficients are rescaled, the relative weightings of the
CASIN and CASOUT ports will differ accordingly.
Data Overflow
As shown in Table 2, the TMC2250A's matched input and
output data formats accommodate 0dB (unity) gain. Therefore, the user must be aware of input conditions that could
lead to numeric overflow. Maximum input data and coefficient word sizes must be taken into account with the specific
algorithm performed to ensure that no overflow occurs.
Table 1. Data Port Formatting by Mode
Mode
Inputs Inputs/Output Outputs
A
11-0
B
11-0
C
11-0
KA
9-0
KB
9-0
KC9-0 XC
11-0
YC
11-8
Y
7-4
YC3-0 ZC
11-0
00 A
11-0
B
11-0
C
11-0
KA
9-0
KB
9-0
KC9-0 X
11-0
Y
11-8
Y
7-4
Y
3-0
Z
11-0
01 A
11-0
B
11-0
NC KA
9-0
KB
9-0
KC9-0 CASIN
15-4
CASIN
3-0
NC CASOUT
3-0
CASOUT
15-4
10 A
11-0
B
11-0
C
11-0
KA
9-0
KB
9-0
KC9-0 CASIN
15-4
CASIN
3-0
NC CASOUT
3-0
CASOUT
15-4
11 A
11-0
B
11-0
NC KA
9-0
KB
9-0
KC9-0 CASIN
15-4
CASIN
3-0
NC CASOUT
3-0
CASOUT
15-4
TMC2250A PRODUCT SPECIFICATION
REV. 1.0.2 10/25/00
3
Table 2. Bit Weightings for Input and Output Data Words
Note: A minus sign indicates a two’s complement sign bit.
Bit Weights 2
11
2
10
2
9
2
8
2
7
2
6
2
5
2
4
2
3
2
2
2
1
2
0
.2
-1
2
-2
2
-3
2
-4
2
-5
2
-6
2
-7
2
-8
2
-9
Inputs
All Modes
Data A, B, C
-I
11
I
10
I
9
I
8
I
7
I
6
I
5
I
4
I
3
I
2
I
1
I
0
.
Coefficients
KA, KB, KC
-K
9
.K
8
K
7
K
6
K
5
K
4
K
3
K
2
K
1
K
0
Modes 01,
10, 11 CASIN
-CI
15
CI
14
CI
13CI12CI11CI10CI9CI8CI7CI6CI5CI4
.CI3CI2CI1CI
0
Internal Sum X20X19X18X17X16X15X14X13X12X11X10X9.X8X7X6X5X4X3X2X1X
0
Outputs
Mode 00
X, Y, Z
-O
11O10O9O8O7O6O5O4O3O2O1O0
.
Modes 01,
10, 11
CASOUT
-
CO
15
CO
1
4
CO
1
3
CO
1
2
CO
1
1
CO
1
0CO9CO8CO7CO6CO5
CO4.CO3CO2CO1CO
0
PRODUCT SPECIFICATION TMC2250A
4 REV. 1.0.2 10/25/00
Pin Assignments
120 Pin Plastic Quad Flat Pack (MQFP), KE Package
XC
6
XC
5
XC
4
XC
3
XC
2
XC
1
XC
0
GND
YC
11
YC
10
YC
9
V
DD
YC
8
Y
7
Y
6
GND
Y
5
Y
4
YC
0
V
DD
YC
1
YC
2
YC
3
GND
ZC
0
ZC
1
ZC
2
ZC
3
ZC
4
ZC
5
1
30
120 91
31 60
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
90
61
ZC
6
ZC
7
ZC
8
GND
ZC
9
ZC
10
ZC
11
KC
0
KC
1
KC
2
KC
3
GND
KC
4
KC
5
KC
6
V
DD
KC
7
KC
8
KC
9
KB
0
KB
1
KB
2
KB
3
KB
4
KB
5
KB
6
KB
7
KB
8
KB
9
KA
0
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
Pin Name Pin Name
KA
1
KA
2
KA
3
KA
4
KA
5
KA
6
KA
7
KA
8
KA
9
CWE
1
CWE
0
GND
A
0
A
1
A
2
A
3
A
4
A
5
A
6
A
7
A
8
A
9
A
10
A
11
B
0
B
1
B
2
CLK
B
3
B
4
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
B
5
B
6
B
7
B
8
B
9
B
10
B
11
C
0
C
1
C
2
C
3
V
DD
C
4
C
5
C
6
GND
C
7
C
8
C
9
C
10
C
11
MODE
1
MODE
0
GND
XC
11
XC
10
XC
9
V
DD
XC
8
XC
7
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
Pin Name Pin Name
TMC2250A PRODUCT SPECIFICATION
REV. 1.0.2 10/25/00 5
Pin Assignments (continued)
120 Pin Plastic Pin Grid Array, H5 Package and 120 Pin Ceramic Pin Grid Array, G1 Package and
120 Pin Plastic Quad Flatpack to 120-Pin Pin Grid Array (MPGA)
BADEFGHJKLMNC
1
2
3
4
5
6
7
8
9
10
11
12
13
Top View
Cavity Up
KEY
XC
7
XC
9
XC
10
MODE
0
C
11
C
8
C
7
C
5
C
3
C
1
B
10
B
7
B
4
XC
4
XC
5
XC
8
XC
11
MODE
1
C
9
C
6
C
4
C
2
B
11
B
9
B
6
B
2
XC
1
XC
2
XC
6
V
DD
A1
A2
A3
A4
A5
A6
A7
A8
A9
A10
A11
A12
A13
B1
B2
B3
B4
B5
B6
B7
B8
B9
B10
B11
B12
B13
C1
C2
C3
C4
GND
C
10
GND
V
DD
C
0
B
8
B
5
B
3
B
1
YC
11
XC
0
XC
0
CLK
B
0
A
10
YC
9
YC
10
GND
A
11
A
9
A
8
Y
7
YC
8
V
DD
A
7
A
6
A
5
Y
5
Y
6
GND
C5
C6
C7
C8
C9
C10
C11
C12
C13
D1
D2
D3
D11
D12
D13
E1
E2
E3
E11
E12
E13
F1
F2
F3
F11
F12
F13
G1
G2
G3
Pin Name Pin Name
A
3
A
2
A
3
Y
4
YC
0
V
DD
GND
A
0
A
1
YC
1
YC
2
GND
KA
8
CWE
1
CWE
0
YC
3
ZC
0
ZC
3
KA
4
KA
7
KA
9
ZC
1
ZC
4
ZC
6
GND
KC
0
GND
V
DD
KB
0
KB
4
G11
G12
G13
H1
H2
H3
H11
H12
H13
J1
J2
J3
J11
J12
J13
K1
K2
K3
K11
K12
K13
L1
L2
L3
L4
L5
L6
L7
L8
L9
KB
8
KA
1
KA
5
KA
6
ZC
2
ZC
7
ZC
9
ZC
11
KC
2
KC
4
KC
6
KC
9
KB
2
KB
5
KB
9
KA
2
KA
3
ZC
5
ZC
8
ZC
10
KC
1
KC
3
KC
5
KC
7
KC
8
KB
1
KB
3
KB
6
KB
7
KA
0
L10
L11
L12
L13
M1
M2
M3
M4
M5
M6
M7
M8
M9
M10
M11
M12
M13
N1
N2
N3
N4
N5
N6
N7
N8
N9
N10
N11
N12
N13
Pin Name Pin Name
PRODUCT SPECIFICATION TMC2250A
6 REV. 1.0.2 10/25/00
Pin Descriptions
Pin Name
Pin Number
Function Pin Description
CPGA/PPGA/
MPGA
MQFP
Power
V
DD
F3, H3, L7, C8, C412, 20, 46,
102, 118
Supply
Voltage
The TMC2250A operates from a single +5V supply.
All pins must be connected.
GND E3, G3, J3, L4,
L6, H11, C7,
C5
8, 16, 24, 34,
42, 72, 106,
114
Ground The TMC2250A operates from a single +5V supply.
All pins must be connected.
Clock
CLK D11 88 System Clock The TMC2250A operates from a single system clock
input. All timing specifications are referenced to the
rising edge of clock.
Controls
MODE
1,0
B4, A4 112, 113 Mode Control The TMC2250A will switch to the configuration
selected by the user (as shown in Table 3) on the
next clock. This registered control is usually static;
however, should the user wish to switch between
modes, the internal pipeline latencies of the device
must be taken into account. Valid data will not be
available at the outputs in the new configuration until
enough clocks in the new mode have passed to flush
the internal registers.
CWE
1,0
J12, J13 70, 71 Coefficient
Write Enable
Data presented to the coefficient input ports (KA, KB,
and KC) will update three of the internal coefficient
storage registers, as indicated by the simultaneous
Coefficient Write Enable select, on the next clock.
See Table 4 and the Functional Block Diagram.
Input/Output
A
11-0
E11, D13, E12,
E13, F11, F12,
F13, G13,
G11, G12,
H13, H12
84, 83, 82, 81,
80, 79, 78, 77,
76, 75, 74, 73
Data Input A Data presented to the 12-bit registered data input
ports A, B, and C are latched into the multiplier input
registers for the currently selected configuration
(Table 3). In all modes except Mode 00, new data are
internally right-shifted to the next filter tap on each
rising edge of CLK.
B
11-0
B10, A11, B11,
C10, A12, B12,
C11, A13,
C12, B13,
C13, D12
97, 96, 95, 94,
93, 92, 91, 90,
89, 87, 86, 85
Data Input B
C
11-0
A5, C6, B6, A6,
A7, B7, A8, B8,
A9, B9, A10,
C9
111, 110,
109, 108,
107, 105,
104, 103,
101, 100, 99,
98
Data Input C
TMC2250A PRODUCT SPECIFICATION
REV. 1.0.2 10/25/00 7
Notes:
1. The output ports X, Y, Z and CASOUT, and input port CASIN are internally reconfigured by the device as required for each
mode of the device. The multiple-function pins have names which are combinations of these titles, as appropriate.
2. The output drivers on pins XC
11-0
and YC
11-8
are not necessarily disabled until after the first rising edge of CLK following
power-up. If these pins are to be tied to other output drivers, to each other, or to ground or V
DD
, the user should ensure that
a clock pulse arrives within a few seconds of power-up, to avoid bus contention.
KA
9-0
K13, J11, K12,
L13, L12, K11,
M13, M12,
L11, N13
69, 68, 67, 66,
65, 64, 63, 62,
61, 60
Coefficient
Input A1, A2,
A3
Data presented to the 10-bit registered coefficient
input ports KA, KB and KC are latched three at a time
into the internal coefficient storage register set
indicated by the Coefficient Write Enable CWE
1,0
on
the next clock, as shown in Table 4.
KB
9-0
M11, L10,
N12, N11,
M10, L9, N10,
M9, N9, L8
59, 58, 57, 56,
55, 54, 53, 52,
51, 50
Coefficient
Input B1, B2,
B3
KC
9-0
M8, N8, N7,
M7, N6, M6,
N5, M5, N4, L5
49, 48, 47, 45,
44, 43, 41, 40,
39, 38
Coefficient
Input B1, B2,
B3
XC
11-0
B4, A3, A2, B3,
A1, C3, B2, B1,
D3, C2, C1, D2
115, 116,
117, 119,
120, 1, 2, 3, 4,
5, 6, 7
CASIN
15-4
/
Output X
In all modes except Mode 00, the x port and four bits
of the Y output port are reconfigured as the 16-bit
registered Cascade Input port CASIN
15-0
. Data
presented to this input will be added to the weighted
sums of the data words which were presented to the
input ports (A, B and C).
In the matrix multiply mode, data are available at the
12-bit registered output ports X, Y AND Z tDO after
every clock. These ports are reconfigured in the
filtering modes as 16-bit Cascade Input and Output
ports.CASOUT
15-0
In all modes except Mode 00, the Z port and four bits
of the Y output port are reconfigured as the 16-bit
registered Cascade Output port CASOUT
15-0
.
YC
11-8
D1, E2, E1, F2 9, 10, 11, 13 CASIN
3-0
/
Output Y
11-0
Y
7-4
F1, G2, G1, H1 14, 15, 17, 18 Output
7-4
only
YC
3-0
K1, J2, J1, H2 23, 22, 21, 19 CASOUT
3-0
/
Output Y
3-0
ZC
11-0
M4, N3, M3,
N2, M2, L3,
N1, L2, K3,
M1, L1, K2
37, 36, 35, 33,
32, 31, 30, 29,
28, 27, 26, 25
CASOUT
15-4
/
Output Z
11-0
Pin Descriptions (continued)
Pin Name
Pin Number
Function Pin Description
CPGA/PPGA/
MPGA
MQFP
Table 3. Configuration Mode Word Table 4. Coefficient Write Enable Word
MODE
1,0
Configuration Mode
00 3 x 3 Matrix Multiply
01 9-Tap One Dimensional FIR
10 3 x 3 -Pixel Convolver
11 4 x 2 -Pixel Convolver
CWE
1,0
Coefficient Set Selected
00 Hold all registers
01 Update KA1, KB1, KC1
10 Update KA2, KB2, KC2
11 Update KA3, KB3, KC3
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