Browse Prior Art Database

Shared Storage Bus Circuitry

IP.com Disclosure Number: IPCOM000050265D
Original Publication Date: 1982-Sep-01
Included in the Prior Art Database: 2005-Feb-10
Document File: 2 page(s) / 74K

Publishing Venue

IBM

Related People

Bland, PM: AUTHOR [+2]

Abstract

Having a shared storage subsystem as a common system resource can increase system modularity and improve system performance and throughput. An efficient bus handshaking scheme is necessary to minimize the device to storage interface and to optimize the device storage acess to the storage bandwidth.

This text was extracted from a PDF file.
At least one non-text object (such as an image or picture) has been suppressed.
This is the abbreviated version, containing approximately 100% of the total text.

Page 1 of 2

Shared Storage Bus Circuitry

Having a shared storage subsystem as a common system resource can increase system modularity and improve system performance and throughput. An efficient bus handshaking scheme is necessary to minimize the device to storage interface and to optimize the device storage acess to the storage bandwidth.

The block diagram shown in Fig. 1 represents different functions of a shared storage subsystem. Three asynchronous devices, such as a disk file, a refresh circuit and the center processing unit, contend for the storage cycle. The shared storage resolves conflicts between concurrently asynchronous requests for storage access by assigning fixed priorities to each request. A storage arbiter busy condition occurs when a request for storage access is acknowledged, that is, the request is being serviced. Once the storage access cycle has completed, the arbiter is not busy and will accept the next request for storage access. Each asynchronous device that requests storage access has a respective ready signal to indicate that its request for storage access has been completed.

The drawings in Fig. 2 show the signals associated with the various blocks of Fig. 1.

1

Page 2 of 2

2

[This page contains 7 pictures or other non-text objects]