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Interrupts notify the microcontroller of port access. The Read interrupt
notifies the microcontroller that the Fibre Channel device is requesting
data. The microcontroller responds by clearing the interrupt and writing
one byte of data to the RDATA register which will then be transferred to
the requesting Fibre Channel device. The write interrupt notifies the
microcontroller that the Fibre Channel device has written a byte of data
to the interface. The microcontroller responds by clearing the interrupt
and reading the WDATA register. The SYM53C040 SFF-8067 interface
control is illustrated in a state diagram in
Figure
2.13.
Port access is terminated when the PARALLEL ESI/ pin is deasserted. If
the PARALLEL ESI/ pin of the other port is asserted at that time it will
be granted access.
Refer to
Chapter 5
for SFF-8067 interface register descriptions.
SFF-8067 Mode
2-25
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