January 2008

v 2 . 1

1

© 2008 Actel Corporation

CoreAPB3

Product Summary

Intended Use

•

Intended for Use in Processor-Based Systems to

Implement the AMBA APB Bus Fabric

•

Allows Connection of either AMBA, APB2, or APB3

Peripherals to an APB3 Master

•

Configured for Easy and Automatic System Design

with CoreConsole

•

To Be Used Only with APB Masters that Do Not

Have Built-In APB Address Decoding

Key Features

•

Up to 16 Slave Devices (APB2 or APB3) Supported

•

Automatic

Connection

to

AHB

Bridge

(CoreAHBtoAPB3) and APB Slaves, as well as APB3

Slaves

•

Provides Configurable Address Decoding for APB

Slots

Benefits

•

Allows Easy Connection of APB Devices to a

CoreMP7 or Cortex™-M1 Subsystem

•

Auto Stitch in CoreConsole for Rapid Development

•

Compatible with AMBA, CoreMP7, and Cortex-M1

Supported Device Families

•Fusion

•

IGLOO™

•

IGLOOe

•ProASIC3

•ProASIC3E

Synthesis and Simulation Support

•

Environment (IDE)

Verification and Compliance

•

Compliant with AMBA

General Description

Along

with

CoreAHBtoAPB3,

the

CoreAPB3

bus

component provides an AMBA APB fabric that supports

up to 16 APB slaves. CoreAHBtoAPB3 provides APB

address decoding in the form of select signals. CoreAPB3

is concerned with multiplexing the read data busses,

PREADY signals, and PSLVERR signals to send to

CoreAHBtoAPB3.

Figure 1

gives

an

illustration

of

CoreAPB3.

There is one APB master, which sends out a PSEL signal to

CoreAPB3. This is used by CoreAPB3, along with appropriate

bits from the PADDR bus, to decode the appropriate PSELS

signal. This address decoding is dependent on the RangeSize

hardware parameter/generic. All 16 APB slots are always

of equal size. However, this size may be configured as

any value from 256 locations to 1 M locations by setting

RangeSize appropriately (via CoreConsole).

Contents

Contents ..................................................................... 1

General Description ................................................... 1

Pinout ......................................................................... 2

Connecting CoreAPB3 in CoreConsole ..................... 3

Utilization ................................................................... 3

Ordering Information ................................................ 3

List of Changes ........................................................... 4

Datasheet Categories ................................................. 4

Figure 1 • CoreAPB3

PSTB

PA[31:0]

PWDATA[31:0]

PRDATA[31:0]

PWRITE

PSEL

PRDATA[31:0]

PRDATA[31:0]

PRDATA[31:0]

From Slave 1

From Slave 2

From Slave N

To APB Slaves

From Bridge

To Bridge