MAC7200 datasheet(418/976 Pages) FREESCALE

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Introduction

MAC7200 Microcontroller Family Reference Manual, Rev. 2

340

Freescale Semiconductor

17.1.1

Block Diagram

The block diagram of the FlexBus is shown in Figure 17-1.

Figure 17-1. FlexBus Controller Conceptual Diagram

(Non-Muxed Implementation)

17.1.2

Features

The following list summarizes the key FlexBus features on the MAC7200:

•

22-bit address bus (Maximum of 22 bits pinned out on the MAC72xx)

•

8/16-bit data bus (Maximum of 16-bits pinned out on the MAC72xx)

•

3 dedicated Chip Selects (Maximum of 3 chip selects pinned out on the MAC72xx)

•

Slave only (MAC72xx is always Master)

Table 17-1. External Bus Auto Acknowledge Configuration

PF2/AA

Description

Disabled. Use the TA input to acknowledge transfers

Enabled. Transfers are acknowledged internally, but may also be

acknowledged using the TA input

Table 17-2. External Bus Port Size Configuration

PF3/PS

Description

Port Size is 8-bits (DATA0 to DATA7)

Port Size is 16-bits (DATA0 to DATA15)

R/W

TBST

BWE[0:1]

ADDR (Address)

DATA (Data)

CS[2:0]

FlexBus

Interface

Controller

Chip-Select

Module

IPBI

Chip-Select

Module

Master

External

Slaves

Internal

Peripheral Bus

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