SYSTEM OVERVIEW
The 82258 Advanced DMA (ADMA) Controller offers four channels and provides all the
signals necessary to perform DMA transfers.
Other features of the 82258 are
as
follows:
• Command chaining to perform multiple commands
• Data chaining to scatter data to separate memory locations (separate pages, for example)
and gather data from separate locations
• Automatic assembly and disassembly to convert from 16-bit memory to 8-bit
I/O,
or
vice
versa
• Compare, translate, and verify functions
• The option to replace one of the four high-speed channels with
as
many
as
32
lower-speed,
multiplexed channels.
1-6
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