hsp43168 Intersil Corporation, hsp43168 Datasheet - Page 16

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

†Tied low.
SHIFTEN
FIGURE 17A. COMPUTATIONAL FLOW AS DATA SAMPLE 21 IS
FIGURE 17C. COMPUTATIONAL FLOW AS DATA SAMPLE 23 IS
C0
C2
CSEL0-4
FIGURE 18. CONTROL SIGNAL TIMING FOR 24-TAP
FWRD
ACCEN
23
RVRS
+ (X1 + X22)C1 + (X4 + X19)C4 + (X7 + X16)C7 + (X10 + X13)C10
+ (X2 + X21)C2 + (X5 + X18)C5 + (X8 + X15)C8 + (X11 + X12)C11
INA0-9
21
TXFR
(X0 + X23)C0 + (X3 + X20)C3 + (X6 + X17)C6 + (X9 + X14)C9
(X2 + X21)C2 + (X5 + X18)C5 + (X8 + X15)C8 + (X11 + X12)C11
CLK
+
†
†
†
+
22
0
20
2
C3
0
0
21
CLOCKED INTO THE FEED FORWARD STAGE
CLOCKED INTO THE FEED FORWARD STAGE
DECIMATE X3 FILTER
C5
5
19
0
1
4
20
18
0
1
1
1
ACCUMULATOR
+
+
ACCUMULATOR
2
19
2
3
17
2
5
C6
18
C8
8
16
4
FIGURE 17. DATA FLOW DIAGRAMS FOR 24-TAP DECIMATED BY 3 FIR FILTER
17
3
0
16
7
15
3
3
+
+
4
1
4
16
6
14
8
C11
C9
11
15
5
13
2
7
5
10
14
12
6
ACCEN ASSERTED
AND ACTIVE
TXFR ASSERTED
AND ACTIVE
+
+
CSEL = 2
21
0
CSEL = 0
9
11
21
12 13
10
22
1
22
9
23
HSP43168
2
23
Example 5. Odd-Tap Decimating Symmetric Filter
This example highlights the use of the HSP43168 as two
independent, 23-tap, symmetric, decimate by 3 filters. In this
example, the operational differences in the control signals
and data reversal structure may be compared to the
previously discussed even-tap decimating filter. Figure 19
shows two FIR cells. The data flow in this example uses only
one of the FIR cells.
FIGURE 17B. COMPUTATIONAL FLOW AS DATA SAMPLE 22 IS
FIGURE 17D. COMPUTATIONAL FLOW AS DATA SAMPLE 24 IS
FIGURE 19. USING HSP43168 AS TWO INDEPENDENT FILTERS
C1
C2
INA0-9
INB0-9
24
22
A
B
+(X2 + X21)C2 + (X5 + X18)C5 + (X8 + X15)C8 + (X11 + X12)C11
(X5 + X24)C0 + (X8 + X21)C5 + (X11 + X18)C8 + (X14 + X15)C11
(X1 + X22)C1 + (X4 + X19)C4 + (X7 + X16)C7 + (X10 + X13)C10
+
+
A
B
21
23
1
5
C4
CLOCKED INTO THE FEED FORWARD STAGE
CLOCKED INTO THE FEED FORWARD STAGE
C5
20
22
ODD-TAP DECIMATING
ODD-TAP DECIMATING
0
4
19
21
5
3
ACCUMULATOR
+
ACCUMULATOR
+
FIR A
FIR B
18
20
4
8
C8
C7
HSP43168
17
19
3
7
16
18
8
6
+
+
15
11
17
7
C10
C11
14
M
10
16
U
X
6
11
13
15
9
+
+
CSEL = 1
CSEL = 0
10
14
OUT9-27
13 12
9
12