Microprocessor device with integrated auto-loaded timer

Details Microprocessor device with integrated auto-loaded timer Microprocessor device with integrated auto-loaded timer

1984-01-03

1986-02-18

Zache, Raulfe B.

Boots, shoes, and leggings

G06F 100

Patent

active

045716757

ABSTRACT:
A microprocessor device with an on-chip integrated auto-loaded timer is used in an adapter for a communications loop of the token-passing local area network type. The network has a number of stations coupled to a closed one-way signal path, and each station has a host processor with a host CPU and memory. The microprocessor device with integrated auto-loaded timer is part of an adapter coupled to the host processor. A message frame to be transmitted is copied into a local read/write memory in the adapter by way of the host system bus and a local bus, under initiation by the host CPU. A transmit-and-receive controller is coupled to the local bus to directly access the local read/write memory; when this station has access to the loop (i.e., receives a free token) the transmit-and-receive controller copies the message frame from the local read/write memory to the outgoing signal path, converting from parallel to serial. When the transmit-and-receive controller receives a message addressed to this station, it converts it from serial to parallel, and copies the message frame into the local read/write memory via the local bus, interrupting the local CPU. The message frame is then copied from the local read/write memory to the main memory.

REFERENCES:
patent: 4099232 (1978-07-01), Mensch, Jr.
patent: 4371928 (1983-02-01), Barlow et al.

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