Electrical computers and digital processing systems: memory – Storage accessing and control – Shared memory area
Reexamination Certificate
2005-09-27
2005-09-27
Ellis, Kevin L. (Department: 2188)
Electrical computers and digital processing systems: memory
Storage accessing and control
Shared memory area
Reexamination Certificate
active
06950911
ABSTRACT:
The present invention is directed to a multi-port memory device responsive to two systems. The device includes an array of memory cells each represented by a unique row and column address. The memory device has first and second input/output ports and an input/output control circuit, responsive to the first and second input/output ports, for writing data into and reading data of the array. The device further includes a first signal decoder responsive to the first system for producing first signals for accessing a cell within said array. The device also includes a second signal decoder responsive to the second system for producing second signals for accessing a cell within the array. A control circuit is responsive to the first and second systems for identifying which of the systems is entitled to access to the array in the event both systems seek access to the same address at the same time. The address and data associated with the address from the system not having access are saved so that the operation can be performed when access is granted.
REFERENCES:
patent: 4325116 (1982-04-01), Kranz et al.
patent: 4511960 (1985-04-01), Boudreau
patent: 4698753 (1987-10-01), Hubbins et al.
patent: 4891794 (1990-01-01), Hush et al.
patent: 5043937 (1991-08-01), Glaise et al.
patent: 5448714 (1995-09-01), Stodieck
patent: 5450355 (1995-09-01), Hush
patent: 5454095 (1995-09-01), Kraemer et al.
patent: 5459842 (1995-10-01), Begun et al.
patent: 5459851 (1995-10-01), Nakajima et al.
patent: 5481671 (1996-01-01), Fujisaki
patent: 5568615 (1996-10-01), Sederlund et al.
patent: 5659711 (1997-08-01), Sugita
Cohen Robert
Ladwig Jeff
Ellis Kevin L.
Micro)n Technology, Inc.
Thorp Reed & Armstrong LLP
LandOfFree
Multi-port memory device with multiple modes of operation... does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Multi-port memory device with multiple modes of operation..., we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Multi-port memory device with multiple modes of operation... will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-3422869