A Comprehensive Guide to the APB Protocol: Design and Implementation
2 min readJun 30, 2023
Introduction
The Advanced Peripheral Bus (APB) protocol is a crucial component of the AMBA suite, tailored for low-power and low-bandwidth peripherals. This article provides a detailed examination of APB’s architecture, signal interactions, and practical implementation strategies.
APB Protocol Overview
APB operates as a simple, non-pipelined bus that facilitates communication between low-speed peripherals and higher-speed system components. Its straightforward design makes it easy to implement and integrate into larger systems.
Key Features of APB
- Simplicity: Minimal control signals and straightforward operation reduce complexity.
- Single Clock Cycle Transfers: Ensures predictable timing for peripheral interactions.
- Low Power: Suitable for peripherals where power efficiency is critical.
APB Signal Descriptions
- PCLK: Clock signal for synchronizing the bus.
- PRESETn: Active low reset signal for initializing the bus.
- PADDR: Address bus, specifies the target peripheral register.
- PSELx: Peripheral select…