Digital data apparatus for transferring data between a byte-wide

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395800, 395250, 395275, 36492792, 36492793, 3649263, 3649392, 3649393, 364DIG1, G06F 700, G06F 1300

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active

054287634

ABSTRACT:
A digital data system includes a circuit for controlling data transfer between a four byte wide pathway, such as a VME bus, and a byte wide device, such as a SCSI disk drive by way of a byte wide bus (SCSI bus). The control circuit effects selective data transfer of an odd or even data byte, a data short word (two parallel bytes) or a data long word (four parallel bytes). The transfer circuit includes a four byte wide data register connected to the VME bus, four, byte wide, funnel registers connected in parallel to the data register, a byte wide FIFO memory connected between the funnel registers and the SCSI disk drive via a SCSI bus. A DMA controller and funnel controller state machine control transfer of data from the VME bus to the SCSI disk drive either as a data byte, a data short word or a data long word.

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