ARM ARM DUI 0224I

Hardware Description

The SSP functions as a master or slave interface that enables synchronous serial

communication with slave or master peripherals having one of the following:

• a Motorola SPI-compatible interface

• a Texas Instruments synchronous serial interface

• a National Semiconductor Microwire interface.

Use the SSP controller to access:

• Touch screen, keypad, LCD bias, and analogue inputs on the optional LCD

adaptor board. See Appendix C CLCD Display and Adaptor Board.

• Optional SSP devices, such as an EEPROM, that are connected to the expansion

header J29.

Table3-22 SSP signal descriptions

Name Description

SSPnCS Chip select to external device connected to SSP controller.

SSPFSSOUT PrimeCell SSP frame or slave select output (master).

SSPCLKOUT PrimeCell SSP clock output (master).

SSPRXD PrimeCell SSP receive data input.

SSPTXD PrimeCell SSP transmit data output.

nSSPCTLOE Output enable signal (active LOW) for the SSPCLKOUT output from the

PrimeCell SSP. This output is asserted (LOW) when the device is in master

mode and de-asserted (HIGH) when the device is in slave mode.

SSPFSSIN PrimeCell SSP frame input (slave).

SSPCLKIN PrimeCell SSP clock input (slave).

nSSPOE Output enable signal (active LOW) to indicate when SSPTXD is valid.

nDRVIEN1 Device select signal from RealView Logic Tile. This signal can be driven

HIGH by the logic tile to enable it to drive the SSPRXD signal.