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AT91 Datasheet(PDF) 29 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) 29 Page - ATMEL Corporation

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AT91X40 Series
1354D–ATARM–08/02
Figure 17. Data Hold Time
In early read protocol the data can remain valid longer than in standard read protocol
due to the additional wait cycle which follows a write access.
Wait States
The EBI can automatically insert wait states. The different types of wait states are listed
below:
•
Standard wait states
•
Data float wait states
•
External wait states
•
Chip select change wait states
•
Early read wait states (see “Read Protocols” )
Standard Wait States
Each chip select can be programmed to insert one or more wait states during an access
on the corresponding device. This is done by setting the WSE field in the corresponding
EBI_CSR. The number of cycles to insert is programmed in the NWS field in the same
register.
Below is the correspondence between the number of standard wait states programmed
and the number of cycles during which the NWE pulse is held low:
0 wait states1/2 cycle
1 wait state1 cycle
For each additional wait state programmed, an additional cycle is added.
ADDR
NWE
Data Output
MCK



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