Electrical computers and digital data processing systems: input/ – Input/output data processing – Peripheral adapting
Patent
1997-03-06
1999-11-16
Palys, Joseph E.
Electrical computers and digital data processing systems: input/
Input/output data processing
Peripheral adapting
710128, G06F 1500
Patent
active
059875410
ABSTRACT:
A computer system is presented having various devices capable of exchanging data using either binary data signals or a.c. signals created by carrier waveform modulation. The computer system includes a common bus having a signal bandwidth divided up to form two or more separate communication channels. A first channel has a signal bandwidth extending from 0 Hz to an upper frequency limit .function..sub.H1, and is reserved for binary data signals. The signals associated with two or more data transfers occurring within different communication channels at the same time are superimposed upon one another on the signal lines of the common bus. The signals do not interfere with one another, thus allowing simultaneous communication between devices via different communication channels. The ability to transfer data using conventional binary data signals allows compatibility with existing devices. The various devices may include a video/graphics card, a sound card, a hard disk drive, a CD-ROM drive, and a network interface card. When binary data is transferred from a master device having a modulation interface to a target device, the master device may select a channel from a list of channels the target device is configured to use. The master device generates an output signal consisting of either the binary data, if the selected channel is the first channel, or a data-modulated carrier signal. The master device drives the output signal upon a signal line of the bus. The target device receives the output signal and extracts the binary data from the output signal.
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PCI Local Bus Specification, Revision 2.0, Apr. 30, 1993, pp. i-x, 1-198.
Advanced Micro Devices , Inc.
Kivlin B. Noel
Mai Rijue
Palys Joseph E.
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