MB86606A

FUJITSU SEMICONDUCTOR DATA SHEET DS04-22420-3E ASSP Communication Control CMOS FAST-20 SCSI Protocol Controller MB86606A s DESCRIPTION The MB86606A is an intelligent SCSI protocol controller (SPC) conforming to the ANSI (FAST-20) standard and integrating a PCI local bus interface function. The specification of SCSI controller block is based on the MB86605’s one which is a Wide SCSI protocol controller, but the device functions/features to achieve the FAST-20 data transfer rate of maximum 40 Mbyte/sec at 16-bit FAST-20 SCSI, such as the size of internal data register FIFO, are larged on the MB86606A. As for the SCSI bus pins, a totem pole type single-ended driver/ receiver is incorporated in the device so that it can drive the SCSI bus directly. Furthermore, the MB86606A is capable of connecting the external differential type driver/receiver. The SCSI bus sequence is controlled by commands issued via the system interface. So, it supports sequential commands that perform the phase-to-phase sequences to reduce the overhead of system’s sequence operations. As another key feature to reduce the system overhead, the device has a 2 Kbytes user program memory to store the user program with the commands. Due to this, all the SCSI bus sequences including the data transfer can be performed automatically. As the system interface block, it incorporates a 32-bit PCI local bus interface that easily realizes the SCSI interface on the motherboards of PCI bus based PCs and WSs, in addition t...