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AT91 Datasheet(PDF) 28 Page - ATMEL Corporation

Part # AT91
Description  ARM® Thumb® Microcontrollers
PDF  153 Pages
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Manufacturer  ATMEL [ATMEL Corporation]
Direct Link  http://www.atmel.com
Logo ATMEL - ATMEL Corporation

AT91 Datasheet(HTML) 28 Page - ATMEL Corporation

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28
AT91X40 Series
1354D–ATARM–08/02
Figure 15. Early Read Protocol
Figure 16. Early Read Wait State
Write Data Hold Time
During write cycles in both protocols, output data becomes valid after the falling edge of
the NWE signal and remains valid after the rising edge of NWE, as illustrated in Figure
17. The external NWE waveform (on the NWE pin) is used to control the output data tim-
ing to guarantee this operation.
It is therefore necessary to avoid excessive loading of the NWE pins, which could delay
the write signal too long and cause a contention with a subsequent read cycle in stan-
dard protocol.
ADDR
NCS
NWE
MCKI
NRD
or
ADDR
NCS
NWE
MCKI
Write Cycle
Early Read Wait
Read Cycle
NRD



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