AM McSpi

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This page provides information about the Multichannel Serial Peripheral Interface (McSPI) modules available on the AM35x and AM37x devices.

For more detailed information see Useful Links

1 Features
- 1.1 Function Features
2 Block Diagram
3 Schematic
- 3.1 Master Mode
  - 3.1.1 Master Signal Names and Directions
  - 3.1.2 Master Mode Connection Examples
- 3.2 Slave Mode
  - 3.2.1 Slave Signal Names and Directions
  - 3.2.2 Slave Mode Connection Examples
4 Symbols, Footprints, and Simulation Models
- 4.1 AM35x
- 4.2 AM37x
5 Software Design Support
6 Examples
7 FAQ
8 Useful Links

Features

Function Features

4 independent McSPI modules with up to 4 master channels or single channel in slave mode.

- SPI1 with 4 master channels

- SPI2 with 2 master channels

- SPI3 with 2 master channels

- SPI4 with 1 master channel

Serial clock with programmable frequency, polarity, and phase for each module
Wide selection of SPI word lengths ranging from 4 bits to 32 bits
Up to four master channels or single channel in slave mode
Master multichannel mode:

– Full duplex/half duplex

– Transmit-only/receive-only/transmit-and-receive modes

– Flexible I/O port controls per channel

– Two direct memory access (DMA) requests (read/write) per channel

Single interrupt line for multiple interrupt source events
Power management through wake-up capabilities
Enable the addition of a programmable start-bit for SPI transfer per channel (start-bit mode)
Support start-bit write command
Support start-bit pause and break sequence
64 bytes built-in FIFO available for a single channel

Block Diagram

Schematic

Master Mode

Master Signal Names and Directions

The diagram below shows the signal names and their directions when the module is configured as a master.

Master Mode Connection Examples

The following is an example of the module configured as a master connected to multiple slaves in full duplex mode. Note that only McSpi 1,2 & 3 support multiple slaves.

The following is an example of the module configured as a master with a single slave device which only receives data (has no transmit capability)

Slave Mode

Slave Signal Names and Directions

The diagram below shows the signal names and their directions when the module is configured as a Slave. Note that on modules that support multiple CS signals, only cs0 is supported in slave mode.