Dual port access circuit

Details Dual port access circuit Dual port access circuit

G - Physics

06

F

328/129, 354/234

G06F 13/14 (2006.01) G06F 13/18 (2006.01)

Patent

CA 1202424

- 25 - ABSTRACT DUAL PORT ACCESS CIRCUIT Two microprocessors, which may be operating asynchronously, share a random access memory (RAM) array; that is, at any one moment of time, either microprocessor can seek access to the RAM but only one of them can actually gain access at a time. Priority of access to the RAM is controlled by a dual port contention-resolving access circuit which enables such access alternately to the two microprocessors when both are seeking (overlapping) access, subject to the stipulation when neither microprocessor is accessing the RAM that the very next access will be allocated by the circuit on a first-come first-served basis, and will be allocated to a preselected one of the microprocessors if both microprocessors will commence to seek access precisely at the same time.

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