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A8237 Datasheet(PDF) 6 Page - Altera Corporation

Part No. A8237
Description  PROGRAMMABLE DMA CONTROLLER
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Maker  ALTERA [Altera Corporation]
Homepage  http://www.altera.com
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Altera Corporation
a8237 Programmable DMA Controller Data Sheet
Registers
The a8237 MegaCore function contains the following registers:
s
Base address
s
Current address
s
Base word count
s
Current word count
s
Command
s
Mode
s
Request
s
Mask
s
Status
s
Temporary
Base Address Register
Each of the four DMA channels has a base address register, which is a
16-bit register that contains the starting address for DMA transfers. If
auto-initialization is enabled, the a8237 loads the base address value into
the current address register at the conclusion of a DMA cycle. The
microprocessor writes to the base address register in two parts via
dbin[7..0]
, and simultaneously loads the current address register. The
byte pointer flag chooses either the least significant or most significant
byte. The microprocessor cannot read the base address register.
Current Address Register
Each of the four DMA channels has a current address register, which is a
16-bit register containing the working address value for DMA transfers.
The microprocessor loads the current address register simultaneously
with the base address register via dbin[7..0]. If auto-initialization is
enabled, the a8237 reloads the base address value at the conclusion of a
DMA cycle. The microprocessor reads or writes to the current address
register in two parts via the 8-bit data bus. The byte pointer flag chooses
the least significant or most significant byte. After each DMA transfer, the
current address value is updated with the incremented or decremented
value from the temporary address register (except for channel 0 in
memory-to-memory mode when the address can be held constant).




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