2246AG1C Просмотр технического описания (PDF) - Fairchild Semiconductor

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производитель

2246AG1C

Image Filter 11 x 10 bit, 60 MHz

Fairchild Semiconductor 

TMC2246A

PRODUCT SPECIFICATION

Table 2. Typical TMC2246A Operation Sequence

CLK D1 C1 ENB1 D2 C2 ENB2 D3 C3 ENB3 D4 C4 ENB4 ACC

0-- 0 -- 0 --0 - - 0 -

1 D1(1) C1(1) 1 D2(1) C2(1) 1 D3(1) C3(1) 1 D4(1) C4(1) 1 0

2 D1(2) X 0 D2(2) C2(2) 0 D3(2) X 1 D4(2) X 1 1

3 D1(3) C1(3) 0 D2(3) C2(3) 0 D3(3) X 0 D4(3) X 0 1

4 D1(4) C1(4) - D2(4) C2(4) - D3(4) C3(4) - D4(4) C4(4) - 0

5

6

7

8

Sum

-

-

-

S(5)=D1(1)C1(1)+D2(1)C2(1)

+D3(1)C3(1)+D4(1)C4(1)+ 2-10

S(6)=S(5)+D1(2)C1(1)+D2(2)C2(1)

+D3(2)C3(1)+D4(2)C4(1)

S(7)=S(6)+D1(3)C1(3)+D2(3)C2(3)

+D3(3)C3(1)+D4(3)C4(1)

S(8)=D1(4)C1(4)+D2(4)C2(4)

+D3(4)C3(4)+D4(4)C4(4)+2-10

Notice in this example, operating in fractional two’s complement mode, that rounding is imposed on the first cycle only of an

accumulation. This avoids the propagation of accumulated roundoff errors.

REV. 1.0.3 9/11/00

11

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