System for operating a communication channel in a mixed...

Electrical computers and digital data processing systems: input/ – Input/output data processing – Input/output process timing

Reexamination Certificate

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C710S264000, C709S209000

Reexamination Certificate

active

06243771

ABSTRACT:

BACKGROUND OF THE INVENTION
The invention relates to a method for operating a communication channel in a mixed master/slave subscriber environment through dynamical closing and/or opening operations. The channel may be a serial or parallel bus, a hardware network in another configuration, or even a wireless subsystem. A subscriber may be a hardware station, or one of a plurality of coexistent and/or interactive processes, or even a mixture of hardware and software entities. With increasing system complexity, closing and opening of such communication channel between interconnected modules become increasingly difficult. The main reason is that the modules on which the system is based may have such internal complexity, that communication, termination and commence cannot always take place at any arbitrary instant in time.
SUMMARY TO THE INVENTION
In consequence, amongst other things, it is an object of the present invention to provide a straightforward and easy-to-implement solution for the above problem. We thereto describe a method to avoid close down and start up sequence problems of communication channels by using a handshake protocol between all involved modules on one side and a central communication management module on the other side. Now therefore, according to one of its aspects the invention is characterized according to the remaining parts of claim
1
.
For organizing a resume situation, rather the reverse sequence of the above is effected, according to the main part of claim
2
. Particularly advantageous aspects of the invention relate to power saving, and to the handling of an interrupt routine.
The invention also relates to a system arranged for implementing a method according to the above. Further advantageous aspects of the invention are recited in dependent claims.


REFERENCES:
patent: 4078156 (1978-03-01), Langan
patent: 4860309 (1989-08-01), Costello
patent: 5491778 (1996-02-01), Gordon et al.
patent: 5560019 (1996-09-01), Narad
patent: 5787482 (1998-07-01), Chen et al.
patent: 5838680 (1998-11-01), Noiri et al.
patent: 5838939 (1998-11-01), Sutherland
patent: 5931902 (1999-08-01), Shindoh et al.
patent: 58-100554 (1983-06-01), None

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