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Stellaris® LM3S9B96 Development Kit User’s Manual

September 5, 2010 75

The primary EM header contains one GPIO connection used to shut down and/or reset the EM

module. The actual function depends on the EM module installed. The MODx_nSHUTD signal is

pulled up to 3.3 V on the EM2 adapter. Each header has its own MODx_nSHUTD signal.

The primary EM header contains additional features not found on the secondary EM header

including a 32-KHz oscillator input and a header for a 4-bit SDIO module. These features are not

currently used by the EM modules available today but are available for future expansion.

Secondary EM Header

The secondary EM header should only be used when two EM modules are installed in the system

or when specifically indicated in the EM module’s README First document.

CAT24C01 EEPROM

The EM2 board contains a 1-Kbit I

C EEPROM which connects to an I

C bus separate from the

one connected to the EM headers. This EEPROM contains data that is used by the software

drivers to auto detect that the EM2 expansion board is installed in the system. The EEPROM is

normally write-protected. To make the EEPROM writeable, install a jumper between pins 2 and 3

of JPS1.

S Header

The primary EM header and the secondary EM header each contain connections to separate 6-pin

S headers J2 and J4 respectively. These headers connect to the EM modules only and are not

connected to the EPI header which connects to the DK-LM3S9B96. See the EM module’s

documentation for more information on the functionality of this header.

Analog Audio Header

The primary EM header and the secondary EM header each contain connections to separate 4-pin

analog audio headers J3 and J5 respectively. These headers connect to the EM modules only and

are not connected to the EPI header which connects to the DK-LM3S9B96. See the EM module’s

documentation for more information on the functionality of this header.

SDIO Header

The primary EM header contains a connection to 8-pin SDIO header J1. This header connects to

the EM modules only and is not connected to the EPI header which connects to the

DK-LM3S9B96. See the EM module’s documentation for more information on the functionality of

this header.

EPI Signal Descriptions

Figure G-1 provides the EPI module's signal descriptions.

Table G-1. EPI Signal Descriptions

LM3S9B96 Function Port EM2 Signal Direction Description

PE1 PE1 SPI_CS1 Out SPI Chip Select for Primary EM Module

PJ4 PJ4 SPI_CS2 Out SPI Chip Select for Secondary EM Module

SSI1CLK PH4 SPI_CLK Out SPI Clock

SSI1Rx PF4 SPI_MISO In SPI Receive

1 2 ... 70 71 72 73 74 75 76 77 78 79 80 81

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