Modes of Operation
5-12
ADSP-BF537 Blackfin Processor Hardware Reference
Modes of Operation
The following sections describe the DMA operation.
Register-based DMA Operation
Register-based DMA is the traditional kind of DMA operation. Software
writes source or destination address and length of the data to be trans-
ferred into memory-mapped registers and then starts DMA operation.
For basic operation the software performs these steps:
• Write the source or destination address to the 32-bit
DMAx_START_
ADDR
register.
• Write the number of data words to be transferred to the 16-bit
DMAx_X_COUNT
register.
• Write the address modifier to the 16-bit
DMAx_X_MODIFY
register.
This is the two’s-complement value added to the address pointer
after every transfer. This value must always be initialized as there is
no default value. Typically, this register is set to
0x0004
for 32-bit
DMA transfers, to
0x0002
for 16-bit transfers, and to
0x0001
for
byte transfers.
Summary of Contents for Blackfin ADSP-BF537
Page 42: ...Contents xlii ADSP BF537 Blackfin Processor Hardware Reference ...
Page 90: ...Development Tools 1 32 ADSP BF537 Blackfin Processor Hardware Reference ...
Page 138: ...Programming Examples 4 26 ADSP BF537 Blackfin Processor Hardware Reference ...
Page 340: ...SDC Programming Examples 6 84 ADSP BF537 Blackfin Processor Hardware Reference ...
Page 606: ...Programming Examples 9 94 ADSP BF537 Blackfin Processor Hardware Reference ...
Page 660: ...Programming Examples 10 54 ADSP BF537 Blackfin Processor Hardware Reference ...
Page 720: ...Electrical Specifications 11 60 ADSP BF537 Blackfin Processor Hardware Reference ...
Page 840: ...Programming Examples 13 42 ADSP BF537 Blackfin Processor Hardware Reference ...
Page 876: ...Programming Examples 14 36 ADSP BF537 Blackfin Processor Hardware Reference ...
Page 938: ...Programming Examples 15 62 ADSP BF537 Blackfin Processor Hardware Reference ...
Page 958: ...Programming Examples 17 12 ADSP BF537 Blackfin Processor Hardware Reference ...
Page 986: ...Programming Examples 18 28 ADSP BF537 Blackfin Processor Hardware Reference ...
Page 1162: ...G 26 ADSP BF537 Blackfin Processor Hardware Reference ...
Page 1218: ...Index I 56 ADSP BF537 Blackfin Processor Hardware Reference ...