Arria V Hard Processor System Technical Reference Manual

ID 683011
Date 12/02/2022
Public
Document Table of Contents

20.4.5.3. Glue Logic for Master Port ss_in_n

When configured as a master, the SPI has an input, ssi_in_n, which can be used by the deciding logic in a multi-master system to disable one master when another has priority. The polarity of this signal depends on the serial protocol in use, and the protocol is dynamically selectable.

Note: The signals necessary to support multi-master mode are only provided through the FPGA logic.

The table below lists the three protocols and the effect of ss_in_n on the ability of the master to transfer data. Note that for the SSP protocol the effect of ss_in_n is inverted with respect to the other protocols.

Protocol ss_in_n value Effect on Serial Transfer
Motorola SPI 1 Enabled
0 Disabled
National Semiconductor Microwire 1 Enabled
0 Disabled
Texas Instruments Serial Protocol (SSP) 1 Disabled
0 Enabled
Figure 91. Arbitration Between Multiple Serial Masters
Figure 92. SPI Configured as Master Device