PRODUCT SPECIFICATION
TMC2250A
3 x 3 Pixel Convolver (Mode 10)
This filter configuration accepts a 3 pixel-square neighbor-
hood, side-loaded three pixels at a time through input ports
A, B and C, and multiplies the 9 most recent pixel values by
the coefficient set currently stored in the registers. These
products are summed with the data presented to the cascade
input, and a new 3-cycle impulse response, rounded to 16
bits, is available at the output port 5 to 7 clocks later, with a
new output available on every clock cycle.
The input pixel data are automatically shifted one location to
the right through the three rows of multiplier input registers
on every clock in anticipation of three new input data words,
effectively sliding the convolutional window over one col-
umn in an image plane.
CASOUT(7)=
A(3)KA3(3)+A(2)KA2(2)+A(1)KA1(1)
+B(3)KB3(3)+B(2)KB2(2)+B(1)KB1(1)
+C(3)KC3(3)+C(2)KC2(2)+C(1)KC1(1)
+CASIN(4)
Latency: Impulse in to center of 3-tap response = 6 registers.
Cascade In to Cascade Out=4 registers.
1
CLK
2
3
4
5
6
7
8
9
10
11
CWE
01
10
11
KA, KB, KC
K_1
K_2
K_3
DATA IN A, B, C
1.0
MODE 10
01
CASIN
Q17
ΣK
3
ΣK
2
ΣK
1
CASOUT
Q7
ΣK
j = KAj + KBj + KCj
Figure 5. 3 x 3-Pixel Convolver Impulse Response (Mode 10)
12
REV. 1.0.2 10/25/00
CADEKA [ CADEKA MICROCIRCUITS LLC. ]
