Browse Prior Art Database

Reset and Analyze of System 370-Attached Transputer Network

IP.com Disclosure Number: IPCOM000100176D
Original Publication Date: 1990-Mar-01
Included in the Prior Art Database: 2005-Mar-15
Document File: 2 page(s) / 88K

Publishing Venue

IBM

Related People

Taylor, JL: AUTHOR

Abstract

Described is a method of providing set and reset with analyze sequences to control a transputer network from a connected IBM System/370 (S/370) channel allowing recovery of interfaces and network from any state.

This text was extracted from an ASCII text file.
This is the abbreviated version, containing approximately 52% of the total text.

Reset and Analyze of System 370-Attached Transputer Network

       Described is a method of providing set and reset with
analyze sequences to control a transputer network from a connected
IBM System/370 (S/370) channel allowing recovery of interfaces and
network from any state.

      To interface a network of INMOS transputers to an IBM
System/370 channel, it is required that the interface devices and
attached networks be resettable from the S/370 via a mechanism that
conforms both with the OEM hardware specification for S/370
channel-attached devices specification GA 22-6974-08, and with the
control sequences produced by the S/370 operating system (CP).

      It is also required that the reset sequence may be modified to
provide control of the analyze line for debug of the attached
transputer network.

      Also required is that the S/370 devices may be recovered from
any state, and the transputer link connection be restarted for
subsequent operation following the reset (or reset-with-analyze)
sequence.

      Each link connection to a transputer network is manipulated
from two S/370 device addresses - one for Read and another for Write.
 These two devices each implement the bare essential commands
dictated by the OEM specification for channel-attached devices
(Testio, Basic Sense, Sense ID, and No Operation) and a few other
commands not relevant to this invention.  Additionally, the Read
device implements a Basic Read, and the Write device implements both
a Basic Write and an Analyze control command.  The Read command
causes data received from the link to be transmitted to the S/370 and
the Write command causes data transfer in the other direction.  The
use of a device pair allows the operation of the transputer link in
full duplex, with simultaneous reception and transmission of data
blocks.

      A selective reset sequence on the device aborts execution of
the current operation for that device and causes the status of the
device to be reset.  Except as described below, a subsequent Write
(if the device was a Write Device) or a Read (if a Read Device )
will cause a not-ready indication to the S/370, hence no further I/O...