Texas Instruments C2000 Workshop Guide And Lab Manual

Direct Memory Access (DMA)
C2000 Microcontroller Workshop - Direct Memory Access Controller 9 - 9
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
DMA Throughput
DMA Throughput
 4 cycles/word
(5 for McBSP reads)
 1 cycle delay to start each burst
 1 cycle delay returning from CH1
high priority interrupt
 32-bit transfer doubles throughput
(except McBSP, which supports 16-bit transfers only)
Example: 128 16-bit words from ADC to RAM
8 bursts * [(4 cycles/word * 16 words/burst) + 1] = 520 cycles
Example: 64 32-bit words from ADC to RAM
8 bursts * [(4 cycles/word * 8 words/burst) + 1] = 264 cycles

Texas Instruments C2000 Specifications

General

Brand	Texas Instruments
Model	C2000
Category	Microcontrollers
Language	English