Integrated SCSI and ethernet controller on a PCI local bus
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United States of America Patent
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Sep 25, 2001
Grant Date -
N/A
app pub date -
Jan 24, 1994
filing date -
Jan 24, 1994
priority date (Note) -
In Force
status (Latency Note)
Importance
Abstract
An integration of components of SCSI and Ethernet adapter boards onto a single chip forming an integrated Ethernet-SCSI controller for use on a PCI Local Bus. Integration is enabled by a reduction of noise. Noise is first reduced by reducing ground bounce by providing additional V.sub.SS pins for supporting large PCI and SCSI output buffers which constantly switch current. The VSS pins supporting the large PCI and SCSI output buffers support a limited number of output buffers located in a local area of the pin as connected to the pin by individual lines. Noise is additionally reduced by providing circuitry on the digital output buffers to limit the change of current over time (di/dt) during switching of the output buffers. Noise is further reduced by locating digital control circuitry so that current density increases in a direction away from analog circuitry. Finally, noise is reduced by including bidirectional silicon controlled rectifiers between power supplies in the analog portion, digital portion, and digital I/O buffer portion of the combined Ethernet-SCSI controller.
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