mcf5407 Freescale Semiconductor, Inc, mcf5407 Datasheet - Page 313
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mcf5407
Manufacturer Part Number
mcf5407
Description
Mcf5407 Coldfire Integrated Microprocessor User
Manufacturer
Freescale Semiconductor, Inc
Datasheet
1.MCF5407.pdf
(546 pages)
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Chapter 12
DMA Controller Module
This chapter describes the MCF5407 DMA controller module. It provides an overview of
the module and describes in detail its signals and registers. The latter sections of this
chapter describe operations, features, and supported data transfer modes in detail.
12.1 Overview
The direct memory access (DMA) controller module provides an efficient way to move
blocks of data with minimal processor interaction. The DMA module, shown in
Figure 12-1, provides four channels that allow byte, word, or longword operand transfers.
Each channel has a dedicated set of registers that define the source and destination
addresses (SARn and DARn), byte count (BCRn), and control and status (DCRn and
DSRn). Transfers can be dual or single address to off-chip devices or dual address to
on-chip devices, such as UART, SDRAM controller, and parallel port.
Read Bus Data
Data Path
Requests
Internal
External
Bus
Requests
Channel
Write Bus Data
Figure 12-1. DMA Signal Diagram
Chapter 12. DMA Controller Module
Channel 0
BCR0
DCR0
DSR0
SAR0
DAR0
Data Path
Control
Channel
Enables
Control
Channel 1
MUX
DAR1
BCR1
DCR1
DSR1
SAR1
Arbitration/
Control
MUX
Channel 2
Channel
Attributes
DCR2
SAR2
DAR2
BCR2
DSR2
Current Master Attributes
External Bus Address
External Bus Size
Channel 3
DAR3
BCR3
DCR3
DSR3
SAR3
Interrupts
Interface Bus
Bus Signals
Registered
12-1
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