Texas Instruments TMS320F2837 D Series Workshop Guide And Lab Manual

Direct Memory Access (DMA)
TMS320F2837xD Microcontroller Workshop - Direct Memory Access 8 - 9
Channel Priority Modes
Channel Priority Modes
 Round Robin Mode:
 All channels have equal priority
 After each enabled channel has
transferred a burst of words, the
next enabled channel is serviced
in round robin fashion
 Channel 1 High Priority Mode:
 Same as Round Robin except CH1
can interrupt DMA state machine
 If CH1 trigger occurs, the current
word (not the complete burst) on
any other channel is completed
and execution is halted
 CH1 is serviced for complete burst
 When completed, execution
returns to previous active channel
 This mode is intended primarily
for the ADC, but can be used by
any DMA event configured to
trigger CH1
DMA
event?
CH6 CH1
CH2CH5
CH4 CH3
Y
N
Priority Modes and the State Machine
Read/Write Data
Add Burst Step
to Address
Pointer
Add Transfer
Step to Address
Pointer
Moved
“Burst Size”
Words?
Moved
“Transfer Size”
Bursts?
Y
Y
N
N
Point where other
pending channels
are serviced
Wait for event
to start/continue
transfer
Point where
CH1 can
interrupt other
channels in
CH1 Priority Mode
Start Transfer
End Transfer

Texas Instruments TMS320F2837 D Series Specifications

General

Brand	Texas Instruments
Model	TMS320F2837 D Series
Category	Microcontrollers
Language	English