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AMBA AXI

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AMBA Specification

AMBA: Advanced Microcontroller Bus Architecture

Created by ARM to enable standardized interfaces to theirembedded processors

Actually three standards: APB, AHB, and AXI

Very commonly used for commercial IP cores

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AMBA Specification

AMBA: Advanced Microcontroller Bus Architecture

Created by ARM to enable standardized interfaces to theirembedded processors

Actually three standards: APB, AHB, and AXI

Very commonly used for commercial IP cores

Simple Bus

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AMBA Specification

AMBA: Advanced Microcontroller Bus Architecture

Created by ARM to enable standardized interfaces to theirembedded processors

Actually three standards: APB, AHB, and AXI

Very commonly used for commercial IP cores

Complex Bus

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AMBA Specification

AMBA: Advanced Microcontroller Bus Architecture

Created by ARM to enable standardized interfaces to theirembedded processors

Actually three standards: APB, AHB, and AXI

Very commonly used for commercial IP cores

SoC

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AMBA Specification

AMBA: Advanced Microcontroller Bus Architecture

Created by ARM to enable standardized interfaces to theirembedded processors

Actually three standards: APB, AHB, and AXI

Very commonly used for commercial IP cores

SoC

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AMBA AXI

New approach: define the interface and leave the interconnect upto the designers

Good plan since a specific bus implementation is no longerrequired

It is possible to use AXI to build many different NoCs

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AMBA AXI Read Channels

Slaveinterface

Masterinterface

Read

data

Read

data

Read

data

Read

data

Read data channel

Addres

s and

control

Read address channel

Independent

Give me some data

Here you go

channels synchronized with ID # or

tags

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AMBA AXI Write Channels

Master

interface

Slave

interface

Write

data

Write

data

Write

data

Write

data

Addres

s and

control

Write

Response

Independent

Independent

Im sending data. Please store it.

Here is the data.

I received that data correctly.

channels synchronized with ID #

or tags

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AMBA AXI Flow-Control

Information moves onlywhen:

Source is Valid, and

Destination is Ready

On each channel themaster or slave can limit

the flow

Very flexible

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AMBA AXI Flow-Control

Information moves onlywhen:

Source is Valid, and

Destination is Ready

On each channel themaster or slave can limit

the flow

Very flexible

Transfer

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AMBA AXI Read

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AMBA AXI Read

Read Address Channel

Read Data Channel

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AMBA AXI Write

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AMBA AXI Write

Write Address Channel

Write Response Channel

Write DataChannel