Electronic digital logic circuitry – Signal sensitivity or transmission integrity – Signal level or switching threshold stabilization
Patent
1996-10-22
1998-04-21
Westin, Edward P.
Electronic digital logic circuitry
Signal sensitivity or transmission integrity
Signal level or switching threshold stabilization
326 50, H03K 19003
Patent
active
057421781
ABSTRACT:
In a programmable logic device having a plurality of external pins each of which may be driven by an output drive structure controlled by a programmable logic block, a logic device such as an OR gate or a programmable pull-up or pull-down switch is inserted between the input terminal of the output drive structure and the programmable logic block or other internal logic block which controls the output driver. This inserted structure allows the macrocell to be used for internal logic while the output drive structure is used to stabilize power or ground voltage.
REFERENCES:
patent: 4158147 (1979-06-01), Edwards
patent: 4612459 (1986-09-01), Pollachek
patent: 4806793 (1989-02-01), Golab
patent: 5361001 (1994-11-01), Stolfa
Chiang David
Jenkins, IV Jesse H.
Kucharewski, Jr. Nicholas
Driscoll Benjamin D.
Westin Edward P.
Xilinx , Inc.
Young Edel M.
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