Importance

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Abstract

A SCSI disk controller integrated circuit (SDC IC) provides much of the hardware necessary to perform asynchronous data transfers between a SCSI host bus and a disk interface circuit through two on-chip rotating buffers. The SDC IC is designed to be used in conjunction with a microprocessor and a stored microprocessor program. The SDC IC with its numerous registers reduce external parts by allowing some of the SCSI disk controller functions to be performed in software rather than hardware. On-chip sequence controllers and the rotating buffers of the SDC IC help the microprocessor to separate the control functions and the data transfer functions in order to maximize data transfer throughput. By arranging the control registers, the rotating buffers, and the sequence controller on a single integrated circuit a high performance, compact and inexpensive disk controller can be built using the SDC IC, a microprocessor and a small number of additional integrated circuits.

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First Claim