Opcode to turn around a bi-directional bus

Details Opcode to turn around a bi-directional bus Opcode to turn around a bi-directional bus

2005-05-17

2005-05-17

Dang, Khanh (Department: 2111)

Electrical computers and digital data processing systems: input/

Intrasystem connection

Bus access regulation

C710S113000, C345S503000

Reexamination Certificate

active

06895458

ABSTRACT:
A system for managing the control of a bi-directional data bus between a master unit and a slave unit. The master couples to the slave through a request opcode bus, a reply opcode bus and the data bus. If the master is in a bus driving state (with respect to the data bus) and receives a read request, the master relinquishes bus control and sends a read request through the request opcode bus. The slave unit assumes bus control and sends the requested data through the data bus. If the master is in a bus sensing state and receives a write request, the master sends a last read opcode to the slave via the request opcode bus, and waits for the slave to return a special token through the reply opcode bus. Upon receiving the special token the master unit assumes bus control and performs the write transaction.

REFERENCES:
patent: 4972432 (1990-11-01), Wilson et al.
patent: 5848072 (1998-12-01), Prill et al.
patent: 6624817 (2003-09-01), Langendorf
patent: 6643787 (2003-11-01), Zerbe et al.

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