Programmable peripheral processing controller with mode-selectab

Details Programmable peripheral processing controller with mode-selectab Programmable peripheral processing controller with mode-selectab

1981-03-09

1984-10-09

Thomas, James D.

Boots, shoes, and leggings

G06F 300, G06F 922, G06F 1516

Patent

active

044765223

ABSTRACT:
A peripheral processing controller controls time-shared access to a memory by specialized peripheral devices. The specialized peripheral devices process data independently of a central processor that simply supervises the system. The peripheral processing controller uses predetermined modes of memory space allocation for the various peripheral devices. A memory address register in the controller is assigned to each peripheral device. In addition, each MAR has one or more predefined modes of memory space allocation and, when active, controls memory access for its assigned peripheral device. The modes also define the size of the block of space allocated and whether memory access scrolls through various blocks of space or jumps between blocks of space. The controller also detects when a peripheral device has consumed all the space in a block. Further, for those MAR's having more than one mode of space allocation, the controller selects the mode appropriate for the peripheral device requesting access to the memory.

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