High speed bidirectional signaling scheme

Details High speed bidirectional signaling scheme High speed bidirectional signaling scheme

1995-07-27

1997-02-18

Westin, Edward P.

Electronic digital logic circuitry

Interface

Current driving

326 30, 326 86, 326 60, H03K 190175, H03K 1900

Patent

active

056044500

ABSTRACT:
In a computer system having multiple components, a bidirectional scheme which allows bidirectional data communications between components over a single wire without using termination resistors by placing two drivers from two corresponding processor cores on the same wire, and allowing simultaneous data transfer in two directions. This doubles the effective bandwidth per pin without requiring a modification to the clocking scheme of the system. The driver is impedance matched to the line, and used as the termination for the driver on the opposite end of the wire. This reduces the termination power, since no power is consumed when both drivers are in the same state. The bidirectional flow of data creates a ternary encoding, with a relatively simple decoding possible.

REFERENCES:
patent: 4631428 (1986-12-01), Grimes
patent: 4719369 (1988-01-01), Asano et al.
patent: 5311083 (1994-05-01), Wanlass
patent: 5438281 (1995-08-01), Takahashi et al.
patent: 5457407 (1995-10-01), Shu et al.
patent: 5514983 (1996-05-01), Yoshino

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