Miscellaneous active electrical nonlinear devices – circuits – and – Specific signal discriminating without subsequent control – By amplitude
Patent
1993-06-18
1995-04-11
Sikes, William L.
Miscellaneous active electrical nonlinear devices, circuits, and
Specific signal discriminating without subsequent control
By amplitude
327 77, 327199, G01R 1000, G11C 700, H03F 345, H07R 5152
Patent
active
054061474
ABSTRACT:
An I/O bus interface cell includes a driver circuit having an input terminal fed by a logic signal and an output terminal to produce in response thereto a drive signal having selectable rise and fall time characteristics in accordance with a reference voltage provided to the driver. The I/O cell also includes a receiver circuit having an input terminal coupled to said output terminal of said driver with the receiver disposed to latch an unresolved, unamplified received signal prior to resolving the state of the signal. The I/O cell further includes a termination circuit having a terminal connected to the output of said driver, and having a selectable impedance characteristic at said terminal, with said selectable impedance being in accordance with a reference voltage provided to an input of said termination circuit. Preferably, the I/O cell the driver, receiver and termination circuits are fabricated on a common semiconductor substrate.
REFERENCES:
patent: 4920339 (1990-04-01), Friend et al.
patent: 5029284 (1991-07-01), Feldbaumer
patent: 5047658 (1991-09-01), Shrock
patent: 5117124 (1992-05-01), Dicke
patent: 5173621 (1992-05-01), Fraser
patent: 5272395 (1993-12-01), Vincelette
Coyle Joseph P.
Gist William B.
Cefalo Albert P.
Digital Equipment Corporation
Maloney Denis G.
Nguyen Tiep H.
Sikes William L.
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