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Browse Prior Art Database

S/370 Control Unit Simulator

IP.com Disclosure Number: IPCOM000038650D
Original Publication Date: 1987-Feb-01
Included in the Prior Art Database: 2005-Jan-31
Document File: 2 page(s) / 54K

Publishing Venue

IBM

Related People

Pelos, VE: AUTHOR [+2]

Abstract

A control unit simulator (CUS) tests channel functions in IBM System/ 370 processors in an automated test environment. The CUS works in the following manner. The CUS is a mode-controlled test device which operates in any S/370 channel. A six-card simulator contains the necessary logic to simulate an input/output (I/O) control unit and 8K of high speed RAM to simulate a storage medium (Fig. 1). A control register is set via a code which provides the means of selecting any mode and its design options. The CUS can only test one channel at a time, but the CUS can be switched to eight different channels, as seen in the CUS switching group in Fig. 2. Two simulators are placed in a switch group as a back-up for each other.

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S/370 Control Unit Simulator

A control unit simulator (CUS) tests channel functions in IBM System/ 370 processors in an automated test environment. The CUS works in the following manner. The CUS is a mode-controlled test device which operates in any S/370 channel. A six-card simulator contains the necessary logic to simulate an input/output (I/O) control unit and 8K of high speed RAM to simulate a storage medium (Fig. 1). A control register is set via a code which provides the means of selecting any mode and its design options. The CUS can only test one channel at a time, but the CUS can be switched to eight different channels, as seen in the CUS switching group in Fig. 2. Two simulators are placed in a switch group as a back-up for each other. Three simulator switch groups are placed in a test stall to bring the test capability up to 24 channels without intervention. In addition, by cap

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turing and pointing all six simulators to one cell, simultaneous testing of six channels can be accomplished. The data flow of the simulator is seen in Fig. 3. Depending on the control register setting, the CUS can operate in different modes. When the CUS is in a wrap cable mode, it simulates a channel wrap cable. It wraps all outbound bus lines and tag lines to inbound bus and tag lines.

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When the CUS is in the hardware mode, the CUS simulates an I/O control unit.

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