Texas Instruments C2000

Direct Memory Access (DMA)
C2000 Microcontroller Workshop - Direct Memory Access Controller 9 - 5
Simplified State Machine Example
3 words/burst
2 bursts/transfer
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
Wait for event
to start/continue
transfer
Start Transfer
End Transfer
DMA Interrupts
 Each DMA channel has its
own PIE interrupt
 The mode for each
interrupt can be configured
individually
 The CHINTMODE bit in the
MODE register selects the
interrupt mode
Read/Write Data
Add Burst Step
to Address
Pointer
End Transfer
Add Transfer
Step to Address
Pointer
Moved
“Burst Size”
Words?
Moved
“Transfer Size”
Bursts?
Y
Y
N
N
Wait for event
to start/continue
transfer
Start Transfer
Mode #1:
Interrupt
at start of
transfer
Mode #2:
Interrupt
at end of
transfer