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

Software can read a value that hardware provides.

Write

Software can write a value that is available for hardware usage.

Read, Write

Software can write a value and read it back. The written value is available for hardware usage.

Write-pulse

Software can write a value that is asserted for one clock cycle in hardware.

Read, Write-pulse

Software can read a value that hardware provides. Software can write a value that is asserted for one clock cycle in hardware.

Registers

The following registers make up the register list.

Name Index Address Mode Default value Description

conf

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.