Coded data generation or conversion – Digital code to digital code converters – Tree structure
Patent
1996-03-25
1999-08-24
Lee, Thomas C.
Coded data generation or conversion
Digital code to digital code converters
Tree structure
395893, 395838, 395733, 341 22, G06F 1314, H03K 1794
Patent
active
059435062
ABSTRACT:
A system management interrupt (SMI) generation circuitry is provided to a universal serial bus (USB) complaint personal computer (PC) for generating a SMI whenever the USB controller attempts to generate a data-in interrupt received response to data in from a USB compatible keyboard/pointing device, and whenever an application attempts to perform a direct data-out to the AT keyboard controller. Additionally, a SMI handler is provided to service the SMIs, rerouting the data in to the appropriate input port of the AT keyboard controller, simulating receipt of data from an attached keyboard, thereby providing the data-in to the non-USB cognition application, and rerouting the data-out to the USB controller, thereby providing the data to the targeted USB keyboard/pointing device. As a result, compatibility is maintained between a USB compatible keyboard/pointing device, and non-USB cognition applications that perform direct data-in and data-out against the keyboard controllers.
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patent: 5551044 (1996-08-01), Shah et al.
patent: 5574862 (1996-11-01), Marianetti, II
patent: 5590312 (1996-12-01), Marisetty
patent: 5610601 (1997-03-01), Lahti et al.
patent: 5628029 (1997-05-01), Evoy
Intel Corporation
Lee Thomas C.
Perveen Rehana
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