SCSI device having transfer parameter storage memory blocks whic

Details SCSI device having transfer parameter storage memory blocks whic SCSI device having transfer parameter storage memory blocks whic

1991-03-13

1994-02-01

MacDonald, Allen R.

395275, 395725, 395400, G06F 1516

Patent

active

052838722

ABSTRACT:
In a SCSI device in a small computer system including a plurality of apparatuses, each apparatuses having a SCSI device connected to the apparatus by a MPU bus, and connected to each other through the SCSI device and a SCSI bus. Further each apparatus has an identification (ID) code, and the SCSI device includes; an ID setting register operatively connected to the MPU bus for setting the ID code of another device; an address decoder operatively connected to the ID setting register for decoding the ID code; a transfer parameter storage unit operatively connected to the MPU bus and the address decoder for storing the transfer parameters for all apparatuses constituting the small computer system, and divided into a plurality of memory blocks equivalent to number of the apparatuses to store the transfer parameters for each apparatus; a register operatively connected to the MPU bus for storing various data from the MPU bus; a read/write control unit for receiving a read/write signal and an address signal from the microprocessor, and outputting these signals to the ID setting register, the transfer parameter storage unit, and the register; a data FIFO connected between the SCSI bus and the MPU bus for temporarily storing data; and a transfer control unit operatively connected to the data FIFO and the transfer parameter storage unit for controlling the transfer of the data based on a request signal and an acknowledge signal from the other device through the SCSI bus.

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