DEIF PPU/2/GS ship controller

Interrupts of the MB87033/34 SCSI Controller are fully supported by the FC68165 I/O Controller. The interrupt request of the MB87033/34 is directly connected to the interrupt request channel #4 of the FC68165. The interrupt level and the interrupt vector are both programmable in the FC68165.

Of the eight SCSI devices supported on the SCSIbus, there can be any combination of initiators and targets. Certain SCSIbus functions are assigned to the initiator and other functions are assigned to the target. The initiator may arbitrate for the SCSIbus and select a particular target. The target may request the transfer of COMMAND, DATA, STATUS, or other information on the data bus, and in some cases, it may arbitrate for the SCSIbus and reselect an initiator for the purpose of continuing an operation.

SCSIbus Configuration

 Communication on the SCSIbus is only allowed between two SCSI devices at any given time. There may be a maximum of eight SCSI devices. Each SCSI device has a SCSI ID bit assigned. When two SCSI devices communicate on the SCSIbus, one acts as an initiator and the target device performs the operation. A SCSI device usually has a fixed role as an initiator or target, but some devices may be able to assume either role. An initiator may address up to seven peripheral devices that are connected to a target. An option allows the addressing of up to 2048 peripheral devices per target using extended messages.

SCSIbus Signal Termination

 Each SCSIbus signal should be terminated at the physical start and the physical end of the SCSIbus. Therefore, the CPU-30SEN-R provides circuitry for active termination. Active termination can be controlled by switch SW9-2.Information transfers on the data bus are asynchronous and follow a defined REQ/ACK handshake protocol. One byte of information may be transferred with each handshake. An option is defined for synchronous data transfer.

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