MPC5643L datasheet(8/136 Pages) FREESCALE

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MPC5643L Microcontroller Data Sheet, Rev. 8.1

Introduction

Freescale Semiconductor

port, arbitration logic selects the higher priority master and grants it ownership of the slave port. All other masters requesting

that slave port are stalled until the higher priority master completes its transactions.

The crossbar provides the following features:

•

4 masters and 3 slaves supported per each replicated crossbar

— Masters allocation for each crossbar: e200z4d core with two independent bus interface units (BIU) for I and D

access (2 masters), one eDMA, one FlexRay

— Slaves allocation for each crossbar: a redundant flash-memory controller with 2 slave ports to guarantee maximum

flexibility to handle Instruction and Data array, one redundant SRAM controller with 1 slave port each and 1

redundant peripheral bus bridge

•

32-bit address bus and 64-bit data bus

•

Programmable arbitration priority

— Requesting masters can be treated with equal priority and are granted access to a slave port in round-robin method,

based upon the ID of the last master to be granted access or a priority order can be assigned by software at

application run time

•

Temporary dynamic priority elevation of masters

The XBAR is replicated for each processing channel.

1.5.3

Memory Protection Unit (MPU)

The Memory Protection Unit splits the physical memory into 16 different regions. Each master (eDMA, FlexRay, CPU) can be

assigned different access rights to each region.

•

16-region MPU with concurrent checks against each master access

•

32-byte granularity for protected address region

The memory protection unit is replicated for each processing channel.

1.5.4

Enhanced Direct Memory Access (eDMA)

The enhanced direct memory access (eDMA) controller is a second-generation module capable of performing complex data

movements via 16 programmable channels, with minimal intervention from the host processor. The hardware microarchitecture

includes a DMA engine which performs source and destination address calculations, and the actual data movement operations,

along with an SRAM-based memory containing the transfer control descriptors (TCD) for the channels. This implementation

is used to minimize the overall block size.

The eDMA module provides the following features:

•

16 channels supporting 8-, 16-, and 32-bit value single or block transfers

•

Support variable sized queues and circular buffered queue

•

Source and destination address registers independently configured to post-increment or stay constant

•

Support major and minor loop offset

•

Support minor and major loop done signals

•

DMA task initiated either by hardware requestor or by software

•

Each DMA task can optionally generate an interrupt at completion and retirement of the task

•

Signal to indicate closure of last minor loop

•

Transfer control descriptors mapped inside the SRAM

The eDMA controller is replicated for each processing channel.

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