Apparatus and method for preserving data integrity in multiple-p

Details Apparatus and method for preserving data integrity in multiple-p Apparatus and method for preserving data integrity in multiple-p

1989-01-18

1990-04-17

Popek, Joseph A.

Static information storage and retrieval

Addressing

Multiple port access

3652335, G11C 800

Patent

active

049186647

ABSTRACT:
The invention relates to a random access memory having more than one port capable of accessing the same storage addresses. It provides a system for protection of data integrity at each port. First and second ports are capable of providing first and second address transition signals to enable data storage in a single memory address. A comparator is coupled to the first and second ports (1) for detecting address transitions indicating that the second port is addressing a particular memory address coincidentally when the first port also is addressing the same memory address, and (2) for generating a busy output signal for that address in the event of such coincidence. A transition detection circuit is used to detect the transition resulting from the removal of the busy output signal from the comparator and for providing a busy removal output signal equivalent to an address detection signal in the event of such detection. Finally, the busy removal output signal is combined with the transition detection signals, whereby the data from the second port may be written into the single memory address irrespective of whether the second port itself provides an address transition signal at that time.

REFERENCES:
patent: 4742493 (1988-05-01), Lewallen et al.

Affiliated with

Also associated with

Rating

Apparatus and method for preserving data integrity in multiple-p does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with Apparatus and method for preserving data integrity in multiple-p, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Apparatus and method for preserving data integrity in multiple-p will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-1057976