Priority token protocol circuit for a token ring local area netw

Details Priority token protocol circuit for a token ring local area netw Priority token protocol circuit for a token ring local area netw

1985-12-16

1988-04-05

Olms, Douglas W.

Multiplex communications

Wide area network

Packet switching

34082505, H04J 316, H04Q 300

Patent

active

047363681

ABSTRACT:
A fairness protocol circuit for a token ring local area network adaptor having a data-in line for serially carrying tokens/frames and a shift register delay of at least 18 bauds with an input coupled to the data-in line. A TTT stack is coupled to the shift register delay for serially storing values of old token indicators. An III stack is provided for serially storing values of new token priority indicators. TTT means is coupled to the TTT stack for temporarily storing a last old token placed on the TTT stack and serially outputting its bits. The stacks shift up or down bit by bit in response to UNSTACK or STACK control signals and are cleared in response to a clear signal. III means is coupled to the III stack for outputting bit by bit the value of a last new token priority idicator "I" stored on the III stack while at the same time maintaining the value of the last new token priority indicator on the III stack immediately following the outputtting and for replacing the last new token priority indicator stored with a reservation indicator "R" of the token and discarding the last new token priority indicator. Means are provided for comparing "P" and "I", "R" and "P" and "R" and "T". An output data modifier has inputs coupled to an output of the shift register delay, the TTT means, to a selected bit position of the shift delay and transmits a selected one of the inputs to the output in response to selected control signals applied thereto. Finally, a fairness state machine having inputs coupled to outputs of the comparing means and to an IEQZ output of the III stack is operative in response to selected combinations of its inputs to issue control signals to the stacks, the III means, the TTT means and the comparing means.

REFERENCES:
patent: 4491946 (1985-01-01), Kryskow, Jr. et al.
patent: 4507777 (1985-03-01), Tucker et al.
patent: 4604742 (1986-08-01), Hamada et al.

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