Memory access control system

Details Memory access control system Memory access control system

1977-04-06

1978-09-19

Zache, Raulfe B.

Boots, shoes, and leggings

G06F 1300

Patent

active

041158512

ABSTRACT:
A memory access control system is provided between one or more accessing devices and a main memory composed of a plurality of independently accessible logical storages, and receives a request from the accessing device and, based on the status of the main memory, permits access to one of the logical storages. The memory access control system comprises a shift register, composed of stages corresponding to the cycle time of the main memory, for storing address information sufficient for identifying a busy one of the logical storages and for sequentially shifting the stored content in synchronism with a clock signal, and a comparator circuit for comparing the content of each stage of the shift register with address information of the logical storage designated based on the request from the accessing device, receiving the request based on the result of the comparison, and generating a control signal for accessing the designated logical storage. Using the shift register, one of the logical storages to be accessed can be checked whether it is busy or not, so that even if the number of logical storages is increased with an increase of the capacity of the main memory, the scale of the memory access control system is not enlarged. The shift register also has stored therein the codes of operations, the codes of the accessing devices, etc., and is capable of identifying the accessing device to which data read out from the main memory is to be sent back, and of achieving a partial write control.

REFERENCES:
patent: 3967246 (1976-06-01), House
patent: 3997875 (1976-12-01), Broeren

Affiliated with

Also associated with

Rating

Memory access control system does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with Memory access control system, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Memory access control system will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-2123024