CSR Decoder

Technique

The CSR Decoder is a Bluespec-based demultiplexer-like function within the CSRBox generator pipeline that validates a given RISC-V CSR address against the set of CSRBox-supported addresses and emits a boolean valid signal indicating whether a match was found.

First seen 9/21/2026

Last seen 9/21/2026

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WIKI

CSR Decoder

The CSR Decoder is a processing stage inside the CSRBox RISC-V CSR generator tool. It implements a demultiplexer-style address-validation function written in Bluespec SystemVerilog.

Role in the CSRBox Pipeline

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NEIGHBORHOOD

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RELATIONSHIPS

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CSRBox ← implements 88% 1e

As part of its process, CSRBox includes a Bluespec-based decoder that validates CSR addresses against supported CSRs.

Bluespec System Verilog uses → 78% 1e

The decoder is implemented in a Bluespec style, implying the use of Bluespec SystemVerilog.

LINKED ENTITIES

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CSRBox IMPLEMENTS Extracted graph relationship

Bluespec System Verilog USES Extracted graph relationship

CITATIONS

6 sources

6 citations — click to expand

[1] The CSR Decoder is a Bluespec-based demultiplexer-like function that checks the validity of a given CSR address against all CSRBox-supported addresses and sets a boolean valid signal accordingly. 2. Overview — RISC-V CSRBox Generator 1.0.2 documentation

[2] The decoder sits in the CSRBox working flow alongside Attribute YAML handling, CSR Defines (auto-generated address macros), and WARL support processing. 2. Overview — RISC-V CSRBox Generator 1.0.2 documentation

[3] Preconditions for each CSR before decoder use include size/subfield MSB check, description, address (consumed by the decoder), and shadow CSR identification. 2. Overview — RISC-V CSRBox Generator 1.0.2 documentation

[4] CSRBox 1.0.1 supports all machine-mode CSRs and the supervisor/user-mode CSRs that depend only on the U extension, defining the address set the decoder matches against. 2. Overview — RISC-V CSRBox Generator 1.0.2 documentation

[5] Any additions to the CSRBox attributes YAML must be done in terms of Bluespec code rather than running commentary, consistent with the decoder's implementation in Bluespec. 2. Overview — RISC-V CSRBox Generator 1.0.2 documentation

[6] Generated Bluespec files (including decoder-related code) are placed in a dedicated subfolder of the work directory and validated via successful Bluesim and Verilog compilation. 2. Overview — RISC-V CSRBox Generator 1.0.2 documentation