Four port RAM cell

Details Four port RAM cell Four port RAM cell

1993-12-23

1995-07-18

Popek, Joseph A.

Static information storage and retrieval

Read/write circuit

Simultaneous operations

36523005, 36523006, G11C 700

Patent

active

054348188

ABSTRACT:
A random access memory system having at least four independent access ports. In the preferred mode, a random access memory core is accessible by two independent read ports and two independent write ports. The four ports can separately and simultaneously access the same or different addressable locations within the random access memory core, except for collision conditions. A collision condition occurs whenever more than one write ports attempt to simultaneously write into the same addressable location. Such a simultaneous write access to the same cell could produce a metastable condition wherein the data storage state is indeterminate. Collision conditions result in the aborting of at least one of the write accesses on a priority basis. The abort function also protects the hardware from short circuit.

REFERENCES:
patent: 4623990 (1986-11-01), Allen et al.
patent: 4937781 (1990-06-01), Lee et al.
patent: 4991138 (1991-02-01), Cavaliere et al.
patent: 5111431 (1992-05-01), Garde
patent: 5124950 (1992-06-01), Fukushi et al.
patent: 5142540 (1992-08-01), Glasser
patent: 5235552 (1993-08-01), Nakajima et al.
patent: 5276803 (1994-01-01), Iwase
patent: 5289427 (1994-02-01), Nicholes et al.
"Computer Engineering Handbook", McGraw-Hill, Inc., edited by C. H. Chen, 1992, pp. 14.8-14.9.

Affiliated with

Also associated with

Rating

Four port RAM cell does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with Four port RAM cell, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Four port RAM cell will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-2421387