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AT91 Datasheet(PDF) 31 Page - ATMEL Corporation |
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AT91 Datasheet(HTML) 31 Page - ATMEL Corporation |
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31 / 153 page  31 AT91X40 Series 1354D–ATARM–08/02 Figure 19. Data Float Output Time Notes: 1. Early Read Protocol 2. Standard Read Protocol External Wait The NWAIT input can be used to add wait states at any time. NWAIT is active low and is detected on the rising edge of the clock. If NWAIT is low at the rising edge of the clock, the EBI adds a wait state and changes neither the output signals nor its internal counters and state. When NWAIT is de- asserted, the EBI finishes the access sequence. The NWAIT signal must meet setup and hold requirements on the rising edge of the clock. Figure 20. External Wait Notes: 1. Early Read Protocol 2. Standard Read Protocol ADDR NRD D0 - D15 MCK tDF (1) (2) NCS ADDR NCS NWE MCK NRD (1) (2) NWAIT |
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