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All About The Advanced High-Performance Bus

Advanced High-performance Bus is a protocol that is dedicated to high-performance transfers, connecting internal and external memory and high-performance peripherals. It defines bus transactions as having an addressing phase followed by a data phase. The first phase usually lasts one clock cycle, whereas the second phase might last one or more cycles. These stages can be pipelined to increase performance. Furthermore, several masters can regulate access to the target device using a multiplexer (non-tri-state), allowing only one master to access the bus at a time.

Also read Brief Insight on Advanced Peripheral Bus

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What is the role of an Advanced High-performance bus?

The AHB serves as the system’s high-performance backbone bus. AHB allows for the efficient coupling of CPUs, on-chip memories, and off-chip external memory interfaces with low-power peripheral macrocell operations. AHB is also designed for simplicity of use in an efficient design flow that employs synthesis and automated testing methodologies.

The AMBA AHB (Advanced High-performance Bus) specification provides an interface protocol for embedded designs and other low-latency SoCs that is most commonly used with Cortex-M processors.

The bi-directional AHB/AHB Bridge links high-speed and low-speed AMBA AHB buses. Any frequency ratio between the two connecting buses is supported by the bridge.

Advanced High-Performance Bus (AHB) was introduced by AMBA 2.0. When high-performance qualities are required, AHB is an alternative to Advanced System Bus. Wider data bus topologies, single-cycle bus-master handover, burst transfers, and single clock-edge activities are also supported.

What are the primary components of the Advanced High-performance Bus?

The AHB architecture includes fundamental blocks such as master and slave, and the operation of these blocks is based on an arbitration process. Only one master can access the bus at any given moment, according to the arbitration method.

The AHB was included to allow for high-performance designs. Split transactions, single-cycle bus master handover, single-clock-edge operation, and broader data bus configurations (64/128 bits) were among the additional features implemented in the later version of AHB.

AHB is an example of a point-to-point read bus, as opposed to previous bus designs that employ a single common data bus that is accessed by each slave via a tristate driver. Using point-to-point linkages between each slave and the read multiplexer speeds up the bus and prevents power waste when one slave switches on its driver before another.

AHB-Lite is a subset of AHB specified by the standard’s third edition, in which the bus architecture is simplified for single masters.

Advanced High-performance Bus (AHB) is a free and open standard for interconnecting and managing IP cores in a System-on-Chip (SoC). It enables the development of multi-processor chip designs in a modular, reusable, and scalable way, eliminating costly re-designs and shortening the time-to-market for integrated systems. 


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