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Combining Control Information With Data to Insure Accurate Data Transmission And Reception Across an Asynchronous Channel Interface

IP.com Disclosure Number: IPCOM000100050D
Original Publication Date: 1990-Mar-01
Included in the Prior Art Database: 2005-Mar-15
Document File: 2 page(s) / 73K

Publishing Venue

IBM

Related People

Jackowski, SP: AUTHOR [+2]

Abstract

Described below is a method for insuring the proper identification of data transmitted on an asynchronous interface by combining the data bytes with control bits. The control bits aid in identifying the data bytes and thus simplify processing of the data by the channel.

This text was extracted from an ASCII text file.
This is the abbreviated version, containing approximately 53% of the total text.

Combining Control Information With Data to Insure Accurate Data Transmission And Reception Across an Asynchronous Channel Interface

       Described below is a method for insuring the proper
identification of data transmitted on an asynchronous interface by
combining the data bytes with control bits. The control bits aid in
identifying the data bytes and thus simplify processing of the data
by the channel.

      A channel or some device transferring data on a slower
interface must take into account the fact that the interface
obviously cannot receive or send data at the same rate as the
channel.  As the data is transmitted it must be buffered in some way
to prevent an overrun condition at the interface, and the channel
must be informed when the buffer is capable of accepting more data.
If receiving, the channel must wait for the interface to supply valid
data before processing the data.

      A buffer between the interface and the channel's data
processing mechanism is shown in Fig. 1.  During transmission of
data, the buffer is loaded with data at the channel rate and unloaded
at the interface rate, and vice versa, for the data reception.  The
buffer acts to resynchronize the data either to the interface rate
during transmission or to the channel rate during reception.

      The SKIP signal indicates that the channel should either slow
the transmission of data or that no data is ready for reception yet.
Simply put, the channel cannot load the transmi...