Self-testing peripheral-controller system

• US 4,885,683 A
• Filed: 09/12/1988
• Issued: 12/05/1989
• Est. Priority Date: 09/27/1985
• Status: Expired due to Term

• Current Assignee: Unisys Corporation Blue Bell PA
• Original Assignee: Unisys Corporation
• Inventors: Coogan, Ronald S.
• Primary Examiner(s): Chan, Eddie P.
• Assistant Examiner(s): NOT, DEFINED
• Application Number:
  US07/244,564
• Time in Patent Office: 449 Days
• Field of Search: 371/10, 371/16, 371/17, 371/18, 371/20, 371/21, 371/27, 360/47, 360/53, 364/200 MS File, 364/900 MS File
• US Class Current: 714/36
• CPC Class Codes: G06F 11/2221 to test input/output devices or peripheral units
• CPC Class Codes: G06F 3/0601 Interfaces specially adapted for storage systems
• CPC Class Codes: G06F 3/0673 Single storage device
• CPC Class Codes: G11B 20/1816 Testing

Abstract

A data link processor (peripheral-controller), for managing data transfers to/from multiple disk drive modules, provides a hardware self-test operation to its subsystem card units when it is powered on. The data link processor momentarily disables its interfaces to the peripheral disk drives and the host computer to execute test operations and to indicate either the integrity condition or fault condition of its card units. Each card unit also has a pushbutton for self-test initiation and a local light-emitting diode which lights up and stays lit up if the card unit is misfunctioning to indicate a failed card unit. Further, the connected host computer can initiate the self-test operation for the peripheral-controller for integrity testing.

Claims

1. In a data transfer network wherein a single peripheral-controller, having self-test capabilities, manages data transfers between a main host computer and selected ones of a plurality of disk drive storage modules having differing data parameters and format protocol characteristics, said peripheral-controller comprising:

(a) host interface control means for receiving and storing I/O commands from said host computer and transmitting a elected one of said I/O commands to a formatter control means;

said I/O command including a particularly addressed disk drive module and Read and Write instructions;

said host interface control means including;

(a1) means to transfer information data between said host computer and said formatter control means;

(b) said formatter control means for receiving said selecting one of said I/O commands and for accessing an attribute table PROM which specifies the available sector numbers (beginning and ending addresses), number of heads per drive, and number of bytes per track for the addressed disk drive module;

said formatter control means including;

(b1) said attribute table PROM for storing said data parameters and format protocol characteristics of each of said plurality of disk drive modules;

(b2) means to transfer said information data between said host interface control means and a disk module interface means according to said data parameters and format protocol characteristics derived from said attribute table PROM;

(c) said disk module interface means for establishing the identity of the selected disk drive module and for enabling Read/Write data transfers between said selected disk module and said formatter control means;

(d) means for initiating and executing a self-test operation of said host interface control means, of said formatter control means and said disk module interface means.

2. The peripheral-controller of claim 1 wherein said means for initiating a self-test operation includes:

(a) manual push button means in said host interface control means;

(b) a display means to indicate any misfunction of said host interface control means.

3. The peripheral-controller of claim 1 wherein said means for initiating a self-test operation includes:

(a) manual push button means in said formatter control means;

(b) a display means to indicate any misfunction of said formatter control means.

4. The peripheral-controller of claim 1 wherein said means for initiating a self-test operation includes:

(a) means to sense a turn-on of power to said peripheral-controller;

(b) means, responsive to said means to sense, for executing a self-test operation of said host interface control means and said formatter control means.

5. The peripheral-controller of claim 1 wherein said means for initiating a self-test operation includes:

(a) means to sense to I/O self-test command from said host computer;

(b) means, responsive to said means to sense, for executing a self-test operation in said host interface control means, in said formatter control means and in said disk module interface means.

6. The peripheral-controller of claim 1 wherein said formatter control means includes:

(a) means to convert serial information data to parallel data during a Read operation;

(b) means to convert parallel information data to serial data during a Write operation.

7. The peripheral-controller of claim 1 wherein said disk module interface means includes:

(a) a plurality of jumper switches for establishing identifying signals to said formatter control means for each one of said disk drive storage modules.

8. The peripheral-controller of claim 7 wherein said disk module interface means includes:

(a) means to detect when more than one disk module has been addressed and selected at the same time;

(b) means, responsive to said means to detect, to initiate an error signal to said formatter control means.

9. The peripheral-controller of claim 1 wherein said formatter control means includes:

(a) sector format protocol means for pattern timing required to format a data record having two sectors, said means for enabling data transfer in a protocol acceptable to a selected disk storage module.

10. The peripheral-controller of claim 1 wherein said disk module interface means includes:

(a) power detect logic means for monitoring the power supplied to said host interface control means, and to said formatter control means, and functioning to shut off said disk module interface means should a power failure occur in said host interface control means or in said formatter control means.