Whisper

Tool

Whisper is a RISC-V instruction set simulator developed by Western Digital. Evidence from a processor-verification paper describes it as usable in co-simulation, with limitations relative to Open-Cosim: RV32-only support, no interrupt handling, and no checkpoint support. The RISCV-DV project also lists Whisper among the ISS targets it can use for co-simulation.

First seen 5/25/2026

Last seen 5/28/2026

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Whisper

Whisper is a RISC-V instruction set simulator developed by Western Digital. In the context of processor verification, it can be used in a co-simulation environment. A MICRO-54 paper comparing verification approaches describes Whisper as an ISS option, while noting that, relative to Open-Cosim, Whisper supports only RV32, does not handle interrupts, and has no support for checkpoints. ^[1]

Use in verification flows

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NEIGHBORHOOD

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RELATIONSHIPS

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Western Digital ← uses 100% 1e

Whisper is the instruction set simulator developed by Western Digital.

Dromajo ← compares with 90% 1e

Dromajo is compared to Whisper as an alternative co-simulation reference model tool.

riscv-dv ← uses 1e

RISCV-DV uses whisper as a co-simulation ISS.

Co-simulation ← uses 1e

Co-simulation in RISCV-DV uses whisper as one of the supported ISS tools.

Co-simulation implements → 90% 1e

Whisper is an ISS developed by Western Digital that can be used for co-simulation.

Western Digital authored by → 100% 1e

Whisper was developed by Western Digital.

Effective Processor Verification with Logic Fuzzer Enhanced Co-simulation ← compares with 90% 1e

The paper compares Dromajo with Whisper, noting Whisper's limitations in interrupt and checkpoint support.

LINKED ENTITIES

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Co-simulation IMPLEMENTS Extracted graph relationship

Western Digital AUTHORED_BY Extracted graph relationship

Effective Processor Verification with Logic Fuzzer Enhanced Co-simulation COMPARES_WITH Extracted graph relationship

CITATIONS

3 sources

3 citations — click to collapse

[1] Whisper is a RISC-V instruction set simulator developed by Western Digital and usable in co-simulation environments. [PDF] Effective Processor Verification with Logic Fuzzer Enhanced Co ...

[2] The cited comparison states that Whisper supports only RV32, does not handle interrupts, and has no checkpoint support relative to Open-Cosim. [PDF] Effective Processor Verification with Logic Fuzzer Enhanced Co ...

[3] RISCV-DV lists Whisper among multiple ISS backends supported for co-simulation. chipsalliance/riscv-dv