Importance

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Abstract

A peripheral unit controller loads a microprocessor program received from a host processor into a random access memory of a microprocessor-controlled peripheral unit. The program-controlled microprocessor included in the peripheral unit controls the transfer of data between the host processor and the memory and between the memory and a communication channel data link. The peripheral unit controller includes input and output buffer registers, a direct memory access controller, and a host access buffer. Connected between data and address buses of the peripheral unit, the host access buffer transfers controller addresses received from the host processor on the data bus to the address bus to load a program memory address and program word count into the registers of the direct memory access controller. In response to orders received from the host processor, the direct memory access controller uses the program memory address and word count to address locations in the random access memory in which the microprocessor program is loaded.

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First Claim