Memory access control device capable of carrying out data transf

Details Memory access control device capable of carrying out data transf Memory access control device capable of carrying out data transf

1993-10-12

1995-07-11

Harvey, Jack B.

G06F 900

Patent

active

054329230

ABSTRACT:
In a memory access control device for use in combination with request sources (A, B, C), a main memory (11), and an expanded memory (12), a request receiving port section (13) successively receives a plurality of input requests as received requests. Supplied with the received requests, a selecting circuit (14) selects one of the received requests as a selected request. Supplied with the selected request, a request judging circuit (15) judges a type of the selected request to produce a request type signal indicative of the type of the selected request. Responsive to the request type signal, a request processing section (16) processes the selected request. The input requests include an access request indicative of access to the main memory, a first data transfer request indicative of transfer of data from the main memory to the expanded memory, and a second data transfer request indicative of transfer of data from the expanded memory to the main memory. The input requests may include a diagnostic request indicative of detection of failure in the main memory.

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