AT91SAM7SE256 ATMEL [ATMEL Corporation], AT91SAM7SE256 Datasheet - Page 18

• Manufacturer Part Number: AT91SAM7SE256
• Description: Product Description
• Manufacturer: ATMEL [ATMEL Corporation]

7.4
7.5
18
External Bus Interface
Static Memory Controller
AT91SAM7SE512/256/32 Preliminary
• Embedded Flash Controller
• Integrates Three External Memory Controllers:
• Additional Logic for NAND Flash and CompactFlash
• Optimized External Bus:
• Configurable Chip Select Assignment:
• External memory mapping, 512-Mbyte address space
• 8-, or 16-bit Data Bus
• Up to 8 Chip Select Lines
• Multiple Access Modes supported
– Individually programmable size between 1K Byte and 1M Byte
– Individually programmable protection against write and/or user access
– Peripheral protection against write and/or user access
– Embedded Flash interface, up to three programmable wait states
– Prefetch buffer, buffering and anticipating the 16-bit requests, reducing the required
– Key-protected program, erase and lock/unlock sequencer
– Single command for erasing, programming and locking operations
– Interrupt generation in case of forbidden operation
– Static Memory Controller
– SDRAM Controller
– ECC Controller
– NAND Flash support: 8-bit as well as 16-bit devices are supported
– CompactFlash support: all modes (Attribute Memory, Common Memory, I/O, True
– 16- or 32-bit Data Bus (32-bit Data Bus for SDRAM only)
– Up to 23-bit Address Bus, Up to 8-Mbytes Addressable
– Up to 8 Chip Selects, each reserved to one of the eight Memory Areas
– Optimized pin multiplexing to reduce latencies on External Memories
– Static Memory Controller on NCS0
– SDRAM Controller or Static Memory Controller on NCS1
– Static Memory Controller on NCS2, Optional CompactFlash Support
– Static Memory Controller on NCS3, NCS5 - NCS6, Optional NAND Flash Support
– Static Memory Controller on NCS4, Optional CompactFlash Support
– Static Memory Controller on NCS7
– Byte Write or Byte Select Lines
– Two different Read Protocols for each Memory Bank
wait states
IDE) are supported but the signals _IOIS16 (I/O and True IDE modes) and -ATA SEL
(True IDE mode) are not handled.
®
Support
6222ES–ATARM–15-Dec-09