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TC94A04AFD Datasheet(PDF) 10 Page - Toshiba Semiconductor |
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TC94A04AFD Datasheet(HTML) 10 Page - Toshiba Semiconductor |
10 / 42 page TC94A04AF/AFD 2001-11-15 10 2.1.3 Setting RAM (ACMP mode) In ACMP mode, the TC94A04AF/AFD does not write data directly to coefficient RAM (CRAM) or offset RAM (OFRAM). In this mode, data must be written to the interface buffer RAM (IFB-RAM). Then, all the data are updated together in a period of 1 fs. For example, if a signal flow filter is designed as in the following diagram, unless the K1 to K5 data are batch-updated, the circuit may resonate. The same applies to the K6 to K10 data. Using ACMP mode can reduce the noise caused by updating coefficients while the TC94A04AF/AFD is operating. IFB-RAM is 32-word memory. Therefore, data can be updated at one time in units of up to 32-words. The length of the data field is 2 × n bytes, where n <= 32. In addition, operation at the time of transmitting other commands, before package rewriting of the data by ACMP mode was completed cannot be guaranteed. Please set up again after initializing by RST terminal or the initialization command. CS A11 A10 A13 A12 A15 A14 IFDI IFCK A9 A8 C3 C2 C5 C4 C7 C6 C1 C0 A3 A2 A5 A4 A7 A6 A1 A0 D3 D2 D5 D4 D7 D6 D1 D0 D11 D10 D13 D12 D15 D14 D9 D8 D1 D0 Don’t care Don’t care Cn: COMMAND An: ADDRESS Dn: Data MCU-I/F IFB-RAM CRAM Write one by one ・・・ Update for 1 fs K6 K1 K2 K3 K4 K5 K7 K8 K9 K10 + + |
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