System for reading transfer control parameters based on identification codes stored in first and second registers storing destination identification and designated control section identification data

摘要

An SCSI controller as an interface device is disclosed. The SCSI controller includes a transfer parameter holder, a data transfer controller and a setting circuit. The transfer parameter holder holds a plural set of data transfer control parameters for data communication between information processing apparatuses and individual internal control sections of a processing apparatus connected to the SCSI controller. A transfer parameter register, provided in the data transfer controller, temporally stores a set of data transfer control parameters used for data communication between its own processing apparatus and any one of other processing apparatuses. The setting circuit selects a set of data transfer control parameters optimum for data communication between a destination processing apparatus and one of the internal control sections designated by the destination apparatus from those in the transfer parameter holder, referring to the identification codes of the destination apparatus as well as the designated internal control section. The setting circuit provides the transfer parameter register with the selected control parameters.