Documentation of caesar registers

This document is a specification for the register interface of the FPGA module caesar.

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Register modes

The following register modes are available.

Mode Description
Read Bus can read a value that fabric provides.
Write Bus can write a value that is available for fabric usage.
Read, Write Bus can write a value and read it back. The written value is available for fabric usage.
Write-pulse Bus can write a value that is asserted for one clock cycle in fabric.
Read, Write-pulse Bus can read a value that fabric provides. Bus can write a value that is asserted for one clock cycle in fabric.

Registers

The following registers make up the register map.

Name Index Address Mode Default value Description
config 0 0x0000 Read, Write 0x40 Configuration register.
  burst_length_bytes   8:0 64 The number of bytes to request.

Valid numeric range: [1 – 256].
  increment   11:9 0 Offset that will be added to data.

Valid numeric range: [-4 – 3].
  retry_count   14:12 0 Number of retry attempts before giving up.

Valid numeric range: [0 – 5].

Constants

This module does not have any constants.