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AHB Bus Interface

Concept WIKI v1 · 6/21/2026

AHB (Advanced High-performance Bus) is one of the selectable on-chip bus interface protocols that can be parameterized into a RISC-V core's RTL design, alongside AXI and TileLink Uncached Light (TL-UL). It is listed as a microarchitectural knob within the broader RISC-V parameterization strategy.

Overview

The AHB Bus Interface refers to the Advanced Microcontroller Bus Architecture (AMBA) High-performance Bus protocol, which can be instantiated as the external interconnect for a RISC-V core. In the context of RISC-V RTL design, AHB is treated as one of several interchangeable bus interface options that can be selected via parameterization.

Role in RISC-V RTL Parameterization

Within a hyper-parameterizable RISC-V RTL codebase, AHB is configured as a microarchitectural knob alongside other bus protocols:

  • AXI — Advanced eXtensible Interface
  • AHB — AMBA High-performance Bus
  • TL-UL — TileLink Uncached Light

These bus interface options sit alongside other configurable features such as pipeline depth, branch predictor structures (BHT vs. BTB sizes), cache associativity, and selectable ISA extensions (M, C, F/D, custom X extensions).

Design Context

A RISC-V core employing an AHB bus interface would integrate the AMBA AHB protocol signals and timing into its memory and peripheral access paths. The choice of bus protocol affects how the core interacts with the surrounding SoC fabric, and parameterizing the choice allows a single RTL codebase to serve different system integration requirements.

See Also

  • Parameterization — the broader design philosophy in which selectable bus interfaces such as AHB are configured as RTL knobs.

LINKED ENTITIES

1 links
Parameterization PART_OF

CITATIONS

2 sources
2 citations
[1] AHB is listed as one of the selectable bus interface options (alongside AXI and TL-UL) within the microarchitectural knobs of a parameterizable RISC-V RTL design. Inside RISC-V: Navigating the RTL Design & Verification Landscape
[2] Bus interfaces are presented as a class of microarchitectural knob that includes AXI, AHB, and TL-UL, configurable alongside pipeline depth, branch predictor structures, and cache associativity. Inside RISC-V: Navigating the RTL Design & Verification Landscape