AT91SAM7A3 datasheet(13/32 Pages) ATMEL

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Preliminary

AT91SAM7A3 Preliminary

6042AS–ATARM–23-Dec-04

Memory

Embedded Memories

•

256 Kbytes of Flash Memory

–

1024 pages of 256 bytes.

–

Fast access time, 30 MHz single cycle access in worst case conditions.

–

Page programming time: 4 ms, including page auto-erase

–

Full erase time: 10 ms

–

10,000 write cycles, 10-year data retention capability

–

16 lock bits, each protecting 64 pages

•

32 Kbytes of Fast SRAM

–

Single-cycle access at full speed

Memory Mapping

Internal RAM

The AT91SAM7A3 embeds a high-speed 32-Kbyte SRAM bank. After reset and until the

Remap Command is performed, the SRAM is only accessible at address 0x0020 0000.

After Remap, the SRAM also becomes available at address 0x0.

Internal Flash

The AT91SAM7A3 features one bank of 256 Kbytes of Flash. The Flash is mapped to

address 0x0010 0000. It is also accessible at address 0x0 after the reset and before the

Remap Command.

Figure 4. Internal Memory Mapping

256M Bytes

Flash Before Remap

SRAM After Remap

Undefined Areas

(Abort)

0x000F FFFF

0x001F FFFF

0x002F FFFF

0x0FFF FFFF

1M Bytes

253M Bytes

Internal Flash

Internal SRAM

0x0000 0000

0x0010 0000

0x0020 0000

0x0030 0000

AT91SAM7A3 Datasheet(PDF) 13 Page - ATMEL Corporation

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