Browse Prior Art Database

Protocol for High Speed Information Transfer Between a System Unit and an Adapter Card

IP.com Disclosure Number: IPCOM000110409D
Original Publication Date: 1992-Nov-01
Included in the Prior Art Database: 2005-Mar-25
Document File: 2 page(s) / 74K

Publishing Venue

IBM

Related People

Bauchot, F: AUTHOR [+3]

Abstract

The method disclosed here defines a protocol enabling Data Flow Control between a System Unit and an Adapter Card.

This text was extracted from an ASCII text file.
This is the abbreviated version, containing approximately 59% of the total text.

Protocol for High Speed Information Transfer Between a System Unit and an Adapter Card

       The method disclosed here defines a protocol enabling
Data Flow Control between a System Unit and an Adapter Card.

      The figure illustrates the environment of the invention.  The
System Unit is referred to as SU, the Adapter Cards as AC.

      The communication window between the SU and the AC is split
into two area:
      - A Data buffer used to vehicle data.
      - An Interface Control (IC) buffer which contains next data,
resources and FC.

      Assuming that a piece of data must be transferred from an
origin task to a destination task, the following steps are followed:
      - The System Unit reads in the IC Buffer presented by the
origin task the address of the first candidate data to be sent by the
origin task.
      - The Data Flow Control component in the System Unit first
determines the destination task.  It then determines if the piece of
data can be delivered or not according to receiving resources
availability status provided by this destination task in its IC
Buffer.
      * If not, the Data Flow Control component asks, using the IC
Buffer, the origin task to flag the address of the proposed data as
'refused' and to propose another piece of data whose address differs
from the preceding one (to avoid to find again that the destination
task cannot receive data), and then iterates to the previous step.
      * If th...