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Computer systems having serial I/O channels (SIOC) can be connected to each other via the SIOC attachments, as illustrated in Fig. 1. Normally, I/O devices are connected to SIOC attachments.
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Error Detection Method
Computer systems having serial I/O channels (SIOC) can be connected to
each other via the SIOC attachments, as illustrated in Fig. 1. Normally, I/O
devices are connected to SIOC attachments.
Cable 10, which connects the two SIOC attachments, includes
status and transfer lines. The process check line in one system is
connected to a transfer line in the other system, and vice versa.
The process check line is active whenever the transfer parity check
latch is set in one system, or if the channel clock run signal is
absent. The logic for developing the process check signal is not
shown; however, the process check lines in cable 10 are shown in Fig.
Thus, in order to determine the ending status of a SIOC I/O operation, the
status and transfer lines in cable 10 are sensed at data Op End time, as
illustrated in Fig. 3. The error recovery procedure is entered after it is
determined an error condition exists. If an error condition exists, a process check
signal from one SIOC activates the transfer 8 line in the other SIOC. The system
receiving the error indication activates the transfer 4 line in the system having the
error. The error must be acknowledged before another start I/O (SIO) is issued.
An SIO to select 4 in one system latches the transfer 4 line in the other system.
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