OPOS93 SP Interfaces description: Difference between revisions
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[[Category: OPOS93_SP]] | [[Category: OPOS93_SP]] | ||
[[Category: FPGA]] | [[Category: FPGA]] | ||
== Introduction == | == Introduction == | ||
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Address is automatically incremented after each fourth byte transferred. | Address is automatically incremented after each fourth byte transferred. | ||
The following chronogram depicts a burst write of the words 0xDEADBEEF, 0xCAFEBABE, 0xFEEDBEBE at 0x0102, 0x0103, 0x0104 respectively. | The following chronogram depicts a burst write of the words 0xDEADBEEF, 0xCAFEBABE, 0xFEEDBEBE at 0x0102, 0x0103, 0x0104 respectively. | ||
[[File: | [[File:flexio_armabus_burstwrite_example.png|frame|center| FlexIO Armabus 3x32b burst write]] | ||
[[Using_FPGA| << FPGA general page]] | [[Using_FPGA| << FPGA general page]] | ||
Latest revision as of 17:56, 9 October 2025
Introduction
The Trion T20 FPGA is accessed by the iMX93 SoC by using a custom FlexIO bus called FlexIO Armabus.
SoC and FPGA interface diagram for Opos93_SP
FlexIO Armabus
The FlexIO Armabus is using FlexIO lines to design a custom 8b parallel communication bus. It consists of the following signals:
- clk: Clock of the bus. Data is shifted out on rising edge and latched on falling edge.
- add_select: Address select, next byte is an address byte.
- data_select: Data select, next byte is a data byte.
- write_enable: Write enable, 1 to write, 0 to read.
- data: Bi-directionnal 8b data.
The memory space mapped on the bus is 16 bits wide. Read/write access are done on 32b (hence 4x 8b transfer).
Read example
The following picture depicts a 32 bits read of the word 0xCAFEBABE at address 0x0042.
FlexIO Armabus 32b read
Write example
The following picture depicts a 32 bits write of the word 0xDEADBEEF at address 0x1545.
FlexIO Armabus 32b write
Burst mode
Address is automatically incremented after each fourth byte transferred. The following chronogram depicts a burst write of the words 0xDEADBEEF, 0xCAFEBABE, 0xFEEDBEBE at 0x0102, 0x0103, 0x0104 respectively.
FlexIO Armabus 3x32b burst write
