Electrical transmission or interconnection systems – Nonlinear reactor systems – Parametrons
Patent
1990-05-11
1991-05-21
Miller, Stanley D.
Electrical transmission or interconnection systems
Nonlinear reactor systems
Parametrons
307473, 307243, 307465, 3072722, H04Q 100
Patent
active
050178130
ABSTRACT:
An input/output module circuit for providing input/output interface functions in integrated circuits includes an input section and an output section electrically connected to an I/O pad of the integrated circuit. The input section includes an input buffer/level shifter for translating the logic signals from the outside world to CMOS compatible levels. The input buffer may be placed in a high impedance state by a control signal applied to a control input. The output of the input buffer/level shifter is connected to a first data input of a two-input multiplexer. The output of the two-input multiplexer is connected to an internal bus and to the second data input of the two-input multiplexer. The select input of the two-input multiplexer is connected to a control signal, preferably to the same control signal used to enable the input buffer/level shifter. The output section of the input/output module section of the present invention includes a two-input multiplexer having a first input connected to an internal data bus, and its output fed back to its second data input. Its select input is driven from a control signal. The output of the two-input multiplexer is also connected to the input of an HCT buffer. The output of the HCT buffer is connected to an I/O pad of the integrated circuit, which may be the same pad to which the input section is connected. The slew input of the HCT buffer is driven from a signal enabling slow or fast rise times. The enable input of the HCT buffer is driven from an enable signal which may be derived from other logic signals.
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Galbraith Douglas C.
Greene Jonathan W.
Actel Corporation
Miller Stanley D.
Ouellette Scott A.
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