Browse Prior Art Database

Input/Output Interface Monitor

IP.com Disclosure Number: IPCOM000081666D
Original Publication Date: 1974-Jul-01
Included in the Prior Art Database: 2005-Feb-28
Document File: 3 page(s) / 41K

Publishing Venue

IBM

Related People

Long, RD: AUTHOR [+3]

Abstract

This completely self-contained monitor connects to the IBM System 360/370 I/O interface as a standard control unit, using standard interface connectors. The interface is described in IBM System Reference Library manual form #A22-6843-3.

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Input/Output Interface Monitor

This completely self-contained monitor connects to the IBM System 360/370 I/O interface as a standard control unit, using standard interface connectors. The interface is described in IBM System Reference Library manual form #A22-6843- 3.

The monitor records the following signals when the selected recording event takes place: 1. Out-tags.

2. In-tags.

3. Data bus-out.

4. Data bus-in.

5. External sync.

The above signals are recorded in a memory location 36 bits in length for each event. All lines are sampled simultaneously for a 'snap-shot' effect of the entire interface. The memory contains 128 locations and once they are used, the oldest data will be written over in a rotating fashion until recording is stopped. The most recent 128 events are held in the memory when stop occurs.

The following events may be selected for recording the interface:

1. Out-tag rise or fall.

2. In-tag rise or fall.

3. Out-tag rise and a specific bus-out data pattern.

4. In-tag rise and a specific bus-in data pattern.

Recording will continue, overlaying the oldest data, until a stop condition occurs. The following conditions are selectable for stopping recording: 1. Multiple in-tags.

2. Glitch detect;

(a) Service-In,

(b) Data-In,

(c) Address-In,

(d) Status-In.

3. Multiple out-tags.

4. Select-Out error.

5. Invalid interface sequence.

6. Invalid Operational-In.

7. Parity error;

(a) Bus-In and Address-In,

(b) Bus-In and Status-In,

(c) Bus-Out and Address-Out,

(d) Bus-Out and Command-Out.

8. External Sync (connected to spare interface line).

The monitor has in and out I/0 connectors, the same as a typical control unit, for connecting to the I/O interface. However, it only receives the signals, with no

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provisions for driving. Because all cables associated with the I/O connecto...