The Serial Peripheral Interface (SPI) allows high-speed synchronous serial data transfer between microprocessors / microcontrollers and peripheral devices. The SPI-MS core can operate either as a Master or a Slave SPI bus device.

When operating in master mode, the core generates the serial data clock (SCK) and selects the slave device, which will be accessed. The SPI-MS core master is able to generate single-byte or multi-byte frames. The internal data path of the core is configurable between 8,16 or 32-bit width. When using a wider that 8-bit data-path, the core is able to generate partial word transfers, by generating frames with less bytes than the data path width. In this manner the core can transmit a data stream with length that is not a multiple of the data-path width.

When operating in slave mode, another master device on the bus generates the Serial Data Clock and activates the Slave Select input of the core to establish communication. The slave is able to split the received data in partial words, in the case that a smaller than the data-path width frame is received. The slave incorporates mechanisms to reject input noise from the SPI bus, achieving a reliable data reception. Transmitted data are also accurately synchronized with the Serial Clock of the SPI bus.

Applications

Interfacing to sensors, ADC/DAC, memories, flash cards and other peripherals using the SPI protocol.

Symbol

Features

Run-time programmable Master or slave mode operation.

Bit rates generated in Master mode: ÷2, ÷4, ÷6, ÷8, ÷10, ÷12, ...÷512 of the system clock.

Bit rates supported in Slave mode: f_SCK ≤ f_SYSCLK ÷4

Support for 1,2,4 or unlimitted bytes multi-byte frame data transfers, run-time programmable.

Support for partial word transfer in 2, 4 or unlimited multi-byte frame modes.

8 Slave Select lines.

8 Chip Select lines.

Configurable RX and TX FIFOs.

Little or Big Endian byte mapping in multi-byte frames.

Literature

SPI-MS designer's reference manual

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