Method of programming an asynchronous load storage device using

Details Method of programming an asynchronous load storage device using Method of programming an asynchronous load storage device using

Filed on

1994-10-06

Date issued

1997-07-15

Examiner

Lall, Parshotam S.

Other Related Categories

G06F 9455

Type

Patent

Status

active

Patent number

056491638

Description

ABSTRACT:
A method and apparatus for converting a storage device having asynchronous clear and asynchronous preset inputs into an equivalent storage device having asynchronous clear and asynchronous load inputs is provided. If the asynchronous clear/asynchronous preset flip-flop is fed by a preset signal but not a clear signal, the equivalent asynchronous clear/asynchronous load flip-flop is implemented by connecting the preset signal to the clear terminal of the asynchronous clear/asynchronous load flip-flop, disabling the load of the asynchronous clear/asynchronous load flip-flop and inverting the input and output signal of the asynchronous clear/asynchronous preset flip-flop. If both a clear and preset signal are fed to the asynchronous clear/asynchronous preset, the preset function can be reduced to (L*D), and the clear input can be reduced to (C+L*D'), then the flip-flop can be implemented by connecting C, L, and D, to the clear, asynchronous load and asynchronous data inputs of the asynchronous clear/asynchronous load flip-flop. If aforementioned conditions are not met, the asynchronous clear/asynchronous preset flip-flop is implemented by placing V.sub.cc on the asynchronous data input and connecting the preset signal of the asynchronous clear/asynchronous preset flip-flop to the asynchronous load input of the asynchronous clear/asynchronous flip-flop.

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Altera Data Book, Sep. 1991, pp. 269-370.

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