This document is a specification for the register interface of the FPGA module caesar.
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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. |
The following registers make up the register map.
| Name | Index | Address | Mode | Default value | Description |
|---|---|---|---|---|---|
| Register array base_addresses, repeated 3 times. Iterator i ∈ [0, 2]. | One set of base addresses for each feature. | ||||
| read_address | 0 + i × 2 | 0x0000 + i × 0x0008 | Read, Write | 0x0 | |
| address | 27:0 | 0b0000000000000000000000000000 | Read address for a 256 MiB address space. | ||
| write_address | 1 + i × 2 | 0x0004 + i × 0x0008 | Read, Write | 0x0 | |
| address | 27:0 | 0b0000000000000000000000000000 | Write address for a 256 MiB address space. | ||
| End register array base_addresses. | |||||
This module does not have any constants.