User`s manual

Division of Functional Responsibilities
SBCSCSI/D1 2-3
2
Division of Functional Responsibilities
The Firmware and the user have definite and separate responsibilities when
communicating with SCSI devices. Basically, the Firmware manages the SCSI
bus protocol while the user manages the device specifics. (See Figure 2-1.) The
following sections provide details of these responsibilities.
Figure 2-1. Firmware/User Interaction Block Diagram
SCSI BUS
NCR 53C710
siop_init
siop_cmd
siop_int
NCR 53C710
SCSI FIRMWAREDRIVER
dev_init
dev_open
dev_close
dev_read
dev_write
dev_cntrl
dev_intr
dev_status
TYPICAL APPLICATION-SPECIFIC
DEVICE DRIVER SOFTWARE
interrupt
via PCCchip2
1178 9308