This version is outdated by a newer approved version.
This version (30 Mar 2015 11:20) is a draft.
Approvals: 0/1
This version (30 Mar 2015 11:20) is a draft.Approvals: 0/1
This is an old revision of the document!
SPI Engine Control Interface
The SPI Engine Control Interface is used to exchange data between different cores within the SPI Engine framework. It is used to exchange the commands and synchronization points as well as the SPI bus transmit and receive data.
The interface consists of four streams:
- The CMD stream which carries the SPI Engine commands
- The SDO stream which carries the to be transmitted data for the SPI bus
- The SDI stream which carries the received data from the SPI bus
- The SYNC stream which carries the synchronization events
Each of the streams has a valid, ready and data signal. They follow the handshaking protocol as defined by the AXI standard. Meaning the master asserts valid when the data on the data signal is valid and the slave asserts ready when it is able to accept new data. If both valid and ready are asserted at the same time the data has been transmitted from the master to the slave.
Signal Pins
| Name | Direction (Master) | Description | |
|---|---|---|---|
cmd_ready | Input | Ready signal of the CMD stream | |
cmd_valid | Output | Valid signal of the CMD stream | |
| [15:0] | cmd_data | Output | Data signal of the CMD stream |
sdo_ready | Input | Ready signal of the SDO stream | |
sdo_valid | Output | Valid signal of the SDO stream | |
| [7:0] | sdo_data | Output | Data signal of the SDO stream |
sdi_ready | Output | Ready signal of the SDI stream | |
sdi_valid | Input | Valid signal of the SDI stream | |
| [7:0] | sdi_data | Input | Data signal of the SDI stream |
sync_ready | Output | Ready signal of the SYNC stream | |
sync_valid | Input | Valid signal of the SYNC stream | |
| [7:0] | sync_data | Input | Data signal of the sync stream |
resources/fpga/peripherals/spi_engine/spi_engine_control_interface.1427707246.txt.gz · Last modified: 30 Mar 2015 11:20 by Lars-Peter Clausen