95 lines
2.6 KiB
ReStructuredText
95 lines
2.6 KiB
ReStructuredText
.. _spi_engine control-interface:
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SPI Engine Control Interface
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================================================================================
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The SPI Engine Control Interface is used to exchange data between different
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cores within the SPI Engine framework. It is used to exchange the commands and
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synchronization points as well as the SPI bus transmit and receive data.
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The interface consists of four streams:
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* The CMD stream which carries the SPI Engine commands. (Master to Slave)
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* The SDO stream which carries the to be transmitted data for the SPI bus.
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(Master to Slave)
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* The SDI stream which carries the received data from the SPI bus. (Slave to
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Master)
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* The SYNC stream which carries the synchronization events. (Slave to Master)
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Each of the streams has a valid, ready and data signal. They follow the
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handshaking protocol as defined by the AXI standard. Meaning the master asserts
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valid when the data on the data signal is valid and the slave asserts ready when
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it is able to accept new data. If both valid and ready are asserted at the same
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time the data has been transmitted from the master to the slave.
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Files
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--------------------------------------------------------------------------------
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.. list-table::
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:header-rows: 1
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* - Name
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- Description
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* - :git-hdl:`master:library/spi_engine/interfaces/spi_engine_ctrl_rtl.xml`
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- Interface definition file
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Signal Pins
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--------------------------------------------------------------------------------
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.. list-table::
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:widths: 10 10 10 70
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:header-rows: 1
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* - Width
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- Name
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- Direction (Master)
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- Description
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* -
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- ``cmd_ready``
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- Input
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- Ready signal of the CMD stream
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* -
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- ``cmd_valid``
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- Output
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- Valid signal of the CMD stream
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* - [15:0]
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- ``cmd_data``
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- Output
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- Data signal of the CMD stream
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* -
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- ``sdo_ready``
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- Input
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- Ready signal of the SDO stream
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* -
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- ``sdo_valid``
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- Output
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- Valid signal of the SDO stream
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* - [DATA_WIDTH-1:0]
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- ``sdo_data``
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- Output
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- Data signal of the SDO stream
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* -
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- ``sdi_ready``
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- Output
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- Ready signal of the SDI stream
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* -
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- ``sdi_valid``
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- Input
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- Valid signal of the SDI stream
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* - [(NUM_OF_SDI*DATA_WIDTH-1):0]
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- ``sdi_data``
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- Input
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- Data signal of the SDI stream
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* -
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- ``sync_ready``
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- Output
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- Ready signal of the SYNC stream
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* -
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- ``sync_valid``
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- Input
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- Valid signal of the SYNC stream
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* - [7:0]
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- ``sync_data``
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- Input
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- Data signal of the sync stream
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