Texas Instruments TMS320F2837 D Series Workshop Guide And Lab Manual

Direct Memory Access (DMA)
8 - 4 TMS320F2837xD Microcontroller Workshop - Direct Memory Access
Basic Operation
DMA Definitions
 Word
 16 or 32 bits
 Word size is configurable per DMA channel

Burst
 Consists of multiple words
 Smallest amount of data transferred at one time

Burst Size
 Number of words per burst
 Specified by BURST_SIZE register
 5-bit ‘N-1’ value (maximum of 32 words/burst)
 Transfer
 Consists of multiple bursts
 Transfer Size
 Number of bursts per transfer
 Specified by TRANSFER_SIZE register
 16-bit ‘N-1’ value - exceeds any practical requirements
Simplified State Machine Operation
Burst Size times
Transfer Size times
The DMA state machine at its most basic
level is two nested loops
End Transfer
Move Word
Start Transfer
DMA can be configured to
re-initialize at the end of the
transfer (continuous mode)

Texas Instruments TMS320F2837 D Series Specifications

General

Brand	Texas Instruments
Model	TMS320F2837 D Series
Category	Microcontrollers
Language	English