Patent
1996-01-16
1998-02-03
Harvey, Jack B.
395882, 395287, 395856, G06F 1300, G06F 1200
Patent
active
057154112
ABSTRACT:
An apparatus and method for converting a subtractive device decode cycle to a peripheral component interface device decode cycle comprising a data communications bus (45), an interface (110) to the data communications bus (45), a function decoder (125) and device decoder (12) coupled to the interface (110). The function decoder (125) and device decoder (120) detect the presence of predetermined command and device types, respectively, on the data communications bus (45). The function decoder (125) and device decoder (120) feed a device select drive circuit (135) when the proper address and command types are detected. Device addresses in preselected ranges are pass-through and maintained internally in order to prevent the subtractive decode agent (90) from grabbing the bus cycle. Also, a positive decode cycle detection circuit (130) is operably coupled to the device select drive circuit (135) to detect the presence of positive decode cycles after the subtractive decode device select signal has been asserted.
REFERENCES:
patent: 5446869 (1995-08-01), Padgett et al.
patent: 5517650 (1996-05-01), Bland et al.
patent: 5522050 (1996-05-01), Amini et al.
patent: 5568621 (1996-10-01), Wooten
Donaldson Richard
Etienne Ario
Harvey Jack B.
Kesterson James
Petersen Bret J.
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