Work station with a DMA controller having extended addressing capability
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United States of America Patent
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-
Sep 23, 1997
Grant Date -
N/A
app pub date -
Aug 30, 1991
filing date -
Aug 31, 1990
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
A DMA controller is connected to a CPU in a work station. The controller includes a multiple byte memory address register (MAR), and a pointer register connected between the CPU and MAR. The pointer register is responsive to a command from the CPU to give the CPU successive access to the byte positions of the MAR for writing a memory address thereto. The DMA controller may also include a single byte register associated with the pointer register and connected between the CPU and MAR. The CPU writes an address to the MAR one byte at a time via the single byte register. Preferably, the MAR has a capacity of four 8 bit bytes.
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