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AT91 bảng dữ liệu(PDF) 32 Page - ATMEL Corporation |
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AT91 bảng dữ liệu(HTML) 32 Page - ATMEL Corporation |
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32 / 153 page ![]() 32 AT91X40 Series 1354D–ATARM–08/02 Additional constraints are applicable to the AT91R40807, the AT91M40807 and the AT91 40800. The behavior of the EBI is correct when NWAIT is asserted during an external memory access: • When NWAIT is asserted before the first rising edge of MCKI • When NWAIT is de-asserted and at least one standard wait state remains to be executed These constraints are not applicable to the AT91R40008. Chip Select Change Wait States A chip select wait state is automatically inserted when consecutive accesses are made to two different external memories (if no wait states have already been inserted). If any wait states have already been inserted, (e.g., data float wait) then none are added. Figure 21. Chip Select Wait Notes: 1. Early Read Protocol 2. Standard Read Protocol NCS1 NCS2 MCK Mem 1 Chip Select Wait Mem 2 NRD NWE (1) (2) |
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