Cypress CY62158EV30 Manual do Utilizador descarregar pdf (Página 21)

January 12, 2010 21

Stellaris® LM3S9B96 Development Board External

Peripheral Interface (EPI)

The External Peripheral Interface (EPI) is a high-speed 8/16/32-bit parallel bus for connecting

external peripherals or memory without glue logic. Supported modes include SDRAM, SRAM, and

Flash memories, as well as Host-bus and FIFO modes.

The LM3S9B96 development kit includes an 8 MB SDRAM board in addition to an EPI break-out

board. Other EPI expansion boards may be available.

SDRAM Expansion Board

The SDRAM board provides 8 MB of memory (4M x 16) which, once configured, becomes part of

the LM3S9B96’s memory map at either 0x6000.0000 or 0x8000.0000. The SDRAM interface

multiplexes DQ00..14 and AD/BA0..14 without requiring external latches or buffers. Of the 32 EPI

signals, only 24 are used in SDRAM mode, with the remaining signals used for non-EPI functions

on the board.

Flash and SRAM Memory Expansion Board

The optional Flash and SRAM memory expansion board (DK-LM3S9B96-EXP-FS8) is a plug-in for

the DK-LM3S9B96 development board. This expansion board works with the External Peripheral

Interface (EPI) of the Stellaris microcontroller and provides Flash memory, SRAM, and an

improved performance LCD interface.

For more information on the DK-LM3S9B96-EXP-FS8 memory expansion board (sold separately),

see Appendix E, “Stellaris® LM3S9B96 Flash and SRAM Memory Expansion Board,” on page 41.

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Cypress CY62158EV30 Manual do Utilizador Página 21