Method and apparatus for monitoring and interfacing a dual port

Details Method and apparatus for monitoring and interfacing a dual port Method and apparatus for monitoring and interfacing a dual port

1996-06-14

1998-01-06

Swann, Tod R.

Boots, shoes, and leggings

364DIG1, 364DIG2, 3642397, 3642679, 36523005, 36523009, 395476, 395494, 39518508, 395495, G06F 1200, G06F 1300

Patent

active

057064687

ABSTRACT:
A method and system for interfacing a dual port RAM interface system are provided. The system is arranged in an optical transmission unit and used at supervisory/control sections thereof. When a DPRAM is unstable, two CPUs supervise it till settling stable so that a correct information regarding a self-system can be sent to a host supervisory unit. The DPRAM mounted with one of the CPUs is used as a data communication medium. The structure judges that the two CPUs are accessible to the DPRAM for normal writing/reading. If two judgements obtained are normal, data communications are started.

REFERENCES:
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patent: 4999768 (1991-03-01), Hirokawa
patent: 5155729 (1992-10-01), Rysko et al.
patent: 5297260 (1994-03-01), Kametari
patent: 5418938 (1995-05-01), Hatanaka et al.
"Dual-Port Static Rams Specialized Memories and Communication" Dave Pryce, EDN, Apr. 13, 1989; vol. 34, No. 8, pp. 83-89.

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