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A8237 Datasheet(PDF) 3 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
7
a8237 Programmable DMA Controller Data Sheet
niowout
Output
Low
I/O write output. Write strobe to I/O devices as DMA reads from memory.
nmemr
Output
Low
Memory read. Read strobe to memory elements during DMA reads or
memory-to-memory transfers.
nmemw
Output
Low
Memory write. Write strobe to memory elements during DMA writes or
memory-to-memory transfers.
aout[7..0]
Output
Address output. During DMA service, aout[7..0] comprises the least
significant byte of the DMA address.
dack[3..0]
Output
DMA acknowledge bus. Programmable polarity. Indicates a DMA cycle
has been granted to the peripheral.
dbout[7..0]
Output
Data bus output. The microprocessor reads data from internal registers
via the dbout[7..0] bus. Also used to output the most significant byte
of the DMA address and temporary data held during memory-to-memory
transfers.
Table 1. a8237 Ports (Part 2 of 2)
Name
Type
Polarity
Description




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