AT91SAM7A2-AI datasheet(35/369 Pages) ATMEL

35 / 369 page

PRELIMINARY

AT91SAM7A2

6021A–ATARM–07/04

The waveforms appearing below and on the following pages give an exhaustive descrip-

tion of how data float wait states apply.

Figure 23. Read and Write Access on Different Chip Select with NTDF = 0 or 1

Figure 24. Read and Write Access on Different Chip Select with NTDF = 2

Table 24. Examples

Access

Next Access

Early Read Mode

Standard Read Mode

TDFx = 0

TDFx = 1

TDFx = 2

TDFx = 3

TDFx = 0

TDFx = 1

TDFx = 2

TDFx = 3

NCSx Read

NCSx Write

012

301

NCSx Write

NCSx Read

NCSx Write

000

NCSx Read

NCSy Read

NCSx Read

NCSy Write

112

311

NCSx Write

NCSy Read

NCSx Write

NCSy Write

111

Address 1

Address 2

ADDRESS

NCS1

NCS2

NOE/NRD

NWE

Data

Read Mem 1

Data Float

Write Mem 2

Data Float

Read Mem 1

Write Mem 2

Address 1

Address 2

ADDRESS

NCS1

NCS2

NOE/NRD

NWE

Data

Write Mem 2

Read Mem 1

Data Float

Write Mem 2

Data Float

NTDF = 2

Read Mem 1

AT91SAM7A2-AI Datasheet(PDF) 35 Page - ATMEL Corporation

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