Intel EP80579

Intel
®
EP80579 Integrated Processor Product Line May 2010
Order Number: 320068-005US 252
Synchronous Serial Port (SSP) Interface—Intel
®
EP80579 Integrated Processor Product Line
24.2.1 Serial Peripheral Interface (SPI)
Serial Peripheral Interface (SPI) is a widely use serial interconnect. Many products are
available specifically to interface to SPI. One of the most common uses of SPI is to
store boot code or data storage. Some other common applications store board revision,
serial numbers, or assembly information. Figure 152 provides an example of a Serial
Flash device interface to the SSP port.
The following table shows how the SSP signals can be mapped when operating in SPI
mode.
Outputs
SSP_SCLK
• Serial Clock
• Can be left NC when the port is not connected to
an interfacing device.
SSP_TXD
• Transmit Data
• Can be left NC when the port is not connected to
an interfacing device.
SSP_SFRM
• Serial Frame
• Can be left NC when the port is not connected to
an interfacing device.
Motorola SPI
SSP_SCLK SCLK - Serial Shift Clock
SSP_TXD MOSI - Master Out Slave In
SSP_RXD MISO - Master In Slave Out
SSP_SFRN /SS - Slave Select