■ DESCRIPTION
The Fujitsu MB86604L is a single-ended transmission type SCSI-II Protocol Controller (SPC) with a single-ended driver/receiver. The MB86604L facilitates interface control between small/medium host computer and peripheral devices (such as a hard disk and printer). The specifications conform to the SCSI-II Standard.

■ FEATURES
SCSI Bus Interface:
• Conforming to the SCSI-II standard
• Operatable as Initiator and target
• Two types of high-speed data transfer:
    – Synchronous data transfer (Max. 10 Mbytes/s, max. 32 offsets, 32-step transfer rate)
    – Asynchronous data transfer (Max. 5 Mbyte/s)
• Transfer parameters (transfer mode, transfer rate, transfer offset) can be set for up to 7 connected devices.
• Single-ended transmission type (Maximum cable length: 6 m):
    – On-chip single-ended driver/receiver which can drive 48 mA of "L" level output current
    – Directly connectable with the SCSI bus
• On-chip three-state bidirectional I/O buffers for SCSI REQ and ACK pins (DB7-DB0, DBP, ATN, MSG, C/D, I/O pins can be selected from either three-state or open-drain buffer by controlling the TEST pins input.)

Transfer Operation:
• Automatic response to selection/reselection (Preset receiving operation can perform at the selection/reselection.):
    – Initiator: Automatically operates until message received without command issue.
    – Target: Automatically operates until command received without command issue.
• Automatic receiving:
    – Initiator: Automatically receives information for new phase to which target transited without command issue.
    – Target: Automatically receives message from initiator when initiator generates attention condition.
• On-chip 32-byte data register (FIFO) for data phase
• On-chip two (send-only and receive-only) 32-byte data buffers for message, command, and status phases
• On-chip 16-bit transfer block register and 24-bit transfer byte register enabling 1 Tbytes transfer (1 Tbytes: 16 Mbytes × 64 k blocks)
• On-chip independent data transfer bus enabling the MPU operation during the data transfer
• Parity through/generate can be specified.

System Bus Interface:
• 8-bit or 16-bit separate MPU and DMA buses
• Directly connectable with a 80 series or 68 series MPU
• Two types of transfer operation:
    – Program transfer
    – DMA transfer (Burst/Handshake)

Command Set:
• Supports sequential commands and programmable commands in addition to ordinary commands
• Command queuing (Command can be continuously issued by putting tags to commands in command phase.)
• On-chip 256-byte memory for command programming memory and command queuing buffer

Others
• Process: CMOS process
• Supply Voltage: Single +5 V
• Input System Clock: 20 MHz/30 MHz/40 MHz
• Package: 100-pin plastic LQFP