APB (Advanced Peripheral Bus)

Concept

The Advanced Peripheral Bus (APB) is a low-power, non-pipelined bus protocol used in System-on-Chip (SoC) designs to connect peripheral devices to higher-performance bus systems. It is part of the AMBA family of bus interfaces and is commonly reached from high-speed buses such as AHB via a bridge that translates burst transactions into simple, single-cycle transfers. APB is also widely used as the bus interface for control and status register (CSR) blocks accessed by embedded software.

First seen 7/20/2026

Last seen 7/20/2026

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Wiki v1

WIKI

APB (Advanced Peripheral Bus)

The Advanced Peripheral Bus (APB) is a low-power, non-pipelined bus protocol used in System-on-Chip (SoC) architectures to connect peripheral devices—particularly low-bandwidth, low-power peripherals—to higher-performance bus subsystems. APB is typically reached via a bridge from a high-speed bus such as the Advanced High-performance Bus (AHB), with the bridge converting complex, pipelined, burst-capable AHB transactions into the simpler, single-cycle transfers that APB uses.

Role in SoC architectures

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NEIGHBORHOOD

3 nodes · 3 edges

graph · APB · depth=1

RELATIONSHIPS

2 connections

IDesignSpec Suite ← introduces 90% 1e

IDesignSpec Suite generates APB bus interface implementations.

Bus Interface part of → 90% 1e

APB is one of the bus interfaces supported in CSR design.

LINKED ENTITIES

2 links

IDesignSpec Suite INTRODUCES Extracted graph relationship

Bus Interface PART_OF Extracted graph relationship

CITATIONS

5 sources

5 citations — click to expand

[1] APB is a low-power, non-pipelined bus protocol used in System-on-Chip (SoC) designs for peripheral devices, typically reached via a bridge from a high-speed bus such as AHB. Integrated AHB to APB Bridge Using Raspberry Pi and Artix-7 FPGA

[2] An AHB-to-APB bridge converts complex, high-speed AHB transactions into simpler, single-cycle APB transactions, handling clock domain synchronization, transaction conversion, and flow control between AHB's burst transfers and APB's non-pipelined protocol. Integrated AHB to APB Bridge Using Raspberry Pi and Artix-7 FPGA

[3] CSRs typically interface to a processor bus such as APB, and the bus interface—including any required clock-domain crossing logic—must be designed as part of the register block. Challenges in CSR Design and Verification Signoff

[4] The IDesignSpec Suite generates RTL for CSRs together with bus interfaces including APB, AHB, AHB-Lite, AXI4, AXI4-Lite, TileLink, Avalon, and Wishbone, along with any required CDC logic and safety mechanisms. Challenges in CSR Design and Verification Signoff

[5] Automated error diagnosis of APB transactions addresses out-of-range access, address corruption, and data corruption errors, and is an active area of SoC verification research. A Multi-stage Error Diagnosis for APB Transaction