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參數(shù)資料
| 型號(hào)： | GF9101-CMQ |
| 廠商： | Electronic Theatre Controls, Inc. |
| 英文描述： | High Performance Multirate Digital Filter |
| 中文描述： | 高性能多速率數(shù)字濾波器 |
| 文件頁數(shù)： | 10/23頁 |
| 文件大?。?/td> | 188K |
| 代理商： | GF9101-CMQ |
520 - 64 - 7
10
G
Fig. 8 Timing Diagram for a 23-Tap Odd-Symmetric Filter
Assuming that the data A0
—
> A21 has already been
shifted into the filter registers, by clocking ENA and ENB the
data A22 enters DATA_A_IN (Figure 9a). During the first
CLK_IN rising edge, the data in the A registers (A22
—
>
A11) are selected by SEL_A/B , to be multiplied by the
coefficients, C0
—
> C11 in memory location 0,
COEF_ADDR 00
H
. During the second CLK_IN rising edge
the data in B registers (A0
—
> A10) are selected by SEL_A/
B, to be multiplied by the coefficients, C0
—
>C10 (Figure
9b). After passing through the adder tree and the delay (4
CLK_IN cycles in total), the two sums are added in the
pipeline section of the filter. FB_SEL selects PIPELINE_IN
during CLK_IN period 5, at which time a DC offset could be
introduced at PIPELINE_IN to be added to the sum. During
CLK_IN period 6, FB_SEL selects PIPELINE_OUT and the
final filter sum is calculated and passed through to
PIPELINE_OUT.
Fig. 9a Data Flow Diagram for a 23 Tap Odd-Symmetric Filter
Fig. 9b Data Flow Diagram for a 23 Tap Odd-Symmetric Filter
EVEN-TAP SYMMETRIC FILTER
The GF9101 can be configured as an even-tap symmetric
filter. A 24-tap symmetric filter can be configured using one
GF9101 by connecting the outputs of DATA_A_OUT to the
inputs
of
DATA_B_IN
and
taking
the
output
at
PIPELINE_OUT. For a 24-tap symmetric filter, the
configuration word is shown in Table 9.
COEF_ADDR
(6 - 0)
CLK_IN
ENA
ENB
SEL_A/B
FB _SEL
PIPELINE _OUT
00
H
CONFIGURE
ZERO
LOAD_EN
ENC
0 1 2 3 4 5 6 7 8 9 10 11
A B A B A B A B A B A
DATA_A_IN
B
PADDER
(A
22
x C
0
) + (A
21
x C
1
) + (A
20
x C
2
) +...+(A
12
x C
10
) + (A
11
x C
11
)
DATA
–
A
–
IN
DATA
–
B
–
OUT
C
0
Σ
x
x
x
x
A
0
A
1
A
2
C
1
C
2
C
10
C
11
A
10
A
11
A
12
A
20
A
21
A
22
x
PIPELINED
ADDER
(A
22
x C
0
) + (A
21
x C
1
) + (A
20
x C
2
) +...+(A
12
x C
10
) + (A
11
x C
11
)
+
DATA
–
A
–
IN
DATA
–
B
–
OUT
C
0
Σ
x
x
x
x
A
0
A1
A
2
C
1
C
2
C
10
C
11
A
11
A
12
A
20
A
21
A
22
(A
0
x C
0
) + (A
1
x C
1
) + (A
2
x C
2
) +...+(A
10
x C
10
)
A10
x
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