Master And Slave Configurations; Figure 77. Primecell Ssp Master Coupled To An Spi Slave; Figure 78. Spi Master Coupled To A Primecell Ssp Slave - Wiznet W7500 Reference Manual

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Master and Slave configurations

Figure 77 shows how a PrimeCell SSP (PL022) configured as master, interfaces to a Motorola

SPI slave. The SPI Slave Select (SS) signal is permanently tied LOW and configures it as a

slave. Similar to the above operation, the master can broadcast to the slave through the

master PrimeCell SSP SSPTXD line. In response, the slave drives its SPI MISO port onto the

SSPRXD line of the master.

Figure 78 shows a Motorola SPI configured as a master and interfaced to an instance of a

PrimeCell SSP (PL022) configured as a slave. In this case, the slave Select Signal (SS) is

permanently tied HIGH to configure it as a master. The master can broadcast to the slave

through the master SPI MOSI line. In response, the slave drives its nSSPOE signal LOW.

This enables its SSPTXD data onto the MISO line of the master.

W7500 Datasheet Version1.0.0