Self diagnosis of a SCSI controller through an I/O port for data transmission/data reception modes of operation
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United States of America Patent
Stats
-
Dec 12, 1995
Grant Date -
N/A
app pub date -
Apr 23, 1993
filing date -
Apr 24, 1992
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
An I/O port enable to intercept the SCSI communications between a SCSI control circuit and host system regardless at the data transmission mode or at data reception mode. When the SCSI communications are intercepted, a system controller transfers data from a main memory to a buffer memory through the SCSI control circuit at the data transmission mode of the SCSI control circuit and performs the self-diagnosis of the SCSI control circuit by comparing data transmitted to the buffer memory with the test data stored in the main memory. At the data reception mode of the SCSI control circuit, the system controller stores data read from the main memory to the buffer memory through the buffer memory control circuit and performs the self-diagnosis of the SCSI control circuit by comparing data read from the I/O port with data stored in the main memory. Thus, it is possible to vest the self-diagnosis function to the disk control system comprising the SCSI control circuit as the communicating means with the host system so that to improve its liability.
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