September 5, 2010
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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-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 Flash and SRAM Memory Expansion Board (sold separately), see
Appendix E, “Stellaris® LM3S9B96 Flash and SRAM Memory Expansion Board,” on page 41.
FPGA Expansion Board
The FPGA Expansion Board (DK-LM3S9B96-FPGA) is an optional expansion board which
connects directly to the External Peripheral Interface (EPI) port of the Stellaris DK-LM3S9B96
development board to demonstrate the machine-to-machine (M2M), high-bandwidth, parallel
interface capability of the Stellaris microcontroller. Right out of the box, users are able to control
and display the FPGA expansion board’s video on the DK-LM3S9B96 development board’s large,
3.5” touchscreen display.
For more information on the FPGA Expansion Board (sold separately), see Appendix F, “Stellaris®
LM3S9B96 FPGA Expansion Board,” on page 49.
EM2 Expansion Board
The EM2 Expansion Board (DK-LM3S9B96-EM2) is an optional expansion board which connects
directly to the External Peripheral Interface (EPI) port of the Stellaris DK-LM3S9B96 development
board. The EM2 Expansion Board provides a transition between the Stellaris External Peripheral
Interface (EPI) connector and the RF Evaluation Module (EM) connector. The DK-LM3S9B96-EM2
enables wireless application development using Low Power RF and RF ID evaluation modules on
the Stellaris DK-LM3S9B96 platform.
For more information on the EM2 Expansion Board (sold separately), see Appendix G, “Stellaris®
LM3S9B96 EM2 Expansion Board,” on page 69.
C H A P T E R 3
Summary of Contents for Stellaris LM3S9B96
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