TMC2246A
PRODUCT SPECIFICATION
Table 2. Typical TMC2246A Operation Sequence
CLK
0
1
2
3
4
5
6
7
8
D1
-
D1(2)
C1
-
X
ENB1
0
1
0
0
-
D2
-
C2
-
ENB2
0
1
0
0
-
D3
-
D3(2)
D3(3)
C3
-
X
X
ENB3
0
1
1
0
-
D4
-
D4(2)
D4(3)
C4
-
X
X
ENB4 ACC
0
1
1
0
-
-
0
1
1
0
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
Sum
-
-
-
D1(1) C1(1)
D1(3) C1(3)
D1(4) C1(4)
D2(1) C2(1)
D2(2) C2(2)
D2(3) C2(3)
D2(4) C2(4)
D3(1) C3(1)
D4(1) C4(1)
D3(4) C3(4)
D4(4) C4(4)
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