hsp43168 Intersil Corporation, hsp43168 Datasheet - Page 19

• Manufacturer Part Number: hsp43168
• Description: Dual Fir Filter
• Manufacturer: Intersil Corporation

h1(n)
C0
A(n)
23 22 21 20 19 18 17 16 15 14 13 12 11 10 9
D0
h2(n)
B(n)
23 22 21 20 19 18 17 16 15 14 13 12 11 10 9 8 7 6 5 4 3 2 1 0
FIGURE 26A. COMPUTATIONAL FLOW AS DATA SAMPLE 21 IS
STREAM
STREAM
B DATA
A DATA
D2
C2
C1
FIGURE 24. DATA/COEFFICIENT ALIGNMENT FOR
D1
21
21
(X2 + X21)C2 + (X5 + X18)C5 + (X8 + X15)C8 + (X11 + X12)C11
C2
(X3 + X21)D2 + (X6 + X18)D5 + (X9 + X15)D8 + (X12 + X12)D11/2
D2
C3
D3
+
+
C4
D4
20
20
3
C5
2
D5
CLOCKED INTO THE FEED FORWARD STAGE
MULTIPLEXED DECIMATION EXAMPLE
D5
C5
19
19
1
C6
2
D6
18
18
1
0
C7
D7
C8
ACCUMULATOR
D8
+
+
ACCUMULATOR
C9
D9
17
17
5
6
C10
D10
D8
C8
16
16
4
5
C11
D11
19
15
15
3
4
D10
C11
+
+
C10 C9
D9
D11/2
D8
14
14
8
9
C11
D7
C8 C7
13
13
8
8
7
12
12
D6
7
6
7
FIRB
FIRA
C6 C5
D5
6
+
+
D4
5
CSEL = 0
CSEL = 0
12
11
D3
C4
4
FIR A
11 10
10
FIR B
D2
C3
3
24-TAPS
23-TAPS
9
D1
C2
2
D0
C1
HSP43168
1
C0
0
Figure 25 shows the Timing Diagram required to obtained the
multiplexed/decimated output. The output of the two filters are
provided at by selecting the odd-decimation filter first, then the
even-decimation second using MUX0-1. Figure 26 shows the
Data Flow Diagram for the multiplexed decimation example.
CSEL0-4
FIGURE 26B. COMPUTATIONAL FLOW AS DATA SAMPLE 22 IS
MUX0-1
ACCEN
D1
C1
+(X2 + X21)C2 + (X5 + X18)C5 + (X8 + X15)C8 + (X11 + X12)C11
(X1 + X22)C1 + (X4 + X19)C4 + (X7 + X16)C7 + (X10 + X13)C10
FIGURE 25. TIMING DIAGRAM FOR MULTIPLEXED
INA0-9
TXFR
22
22
CLK
+ (X3 + X21)D2 + (X6 + X18)D5 + (X9 + X15)D8 + (X12 + X12)D11/2
(X2 + X22)D1 + (X5 + X19)D4 + (X8 + X16)D7 + (X11 + X13)D10
+
+
21
21
0
1
0
2
0
DECIMATION EXAMPLE
D4
C4
CLOCKED INTO THE FEED FORWARD STAGE
20
20
1
0
19
19
5
1
1
6
11
1
ACCUMULATOR
+
ACCUMULATOR
+
2
2
2
18
18
5
4
D7
C7
17
17
10
4
3
3
0
3
16
16
9
8
4
+
+
1
4
11
15
15
8
7
D10
C10
5
5
2
14
14
6
7
12
13
11
13
11
+
+
20
2
CSEL = 1
CSEL = 1
20
11
10
FIR A
FIR B
10
9
10
21
0
21
13
12
22
1
11
22