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GF9101-CMQ Datasheet(PDF) 10 Page - List of Unclassifed Manufacturers |
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GF9101-CMQ Datasheet(HTML) 10 Page - List of Unclassifed Manufacturers |
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10 / 23 page  520 - 64 - 7 10 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 00H . 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 00H 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 PIPELINED ADDER (A22 x C0) + (A21 x C1) + (A20 x C2) +...+(A12 x C10) + (A11 x C11) DATA–A–IN DATA–B–OUT C0 Σ x x x x A0 A1 A2 C1 C2 C10 C11 A10 A11 A12 A20 A21 A22 x PIPELINED ADDER (A22 x C0) + (A21 x C1) + (A20 x C2) +...+(A12 x C10) + (A11 x C11) DATA–A–IN DATA–B–OUT C0 Σ x x x x A0 A1 A2 C1 C2 C10 C11 A11 A12 A20 A21 A22 (A0 x C0) + (A1 x C1) + (A2 x C2) +...+(A10 x C10) + A10 x |
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