
VXIbus Interface
7
7
Module Status/Control Reg
1
IST
1
BTOE
WDTR
FWDT
1
1
815D
This register contains the following miscellaneous status and control bits:
IST
Interrupt status type. This bit specifies whether a response status/ID or an
event status/ID is used in an interrupt acknowledge cycle.
If IST is 0, the response format is used. In the 16-bit status/ID value
returned, the upper 8 bits are the value of the upper 8 bits of the response
register, and the lower 8 bits are the EPC-7's ULA.
If IST is 1, the event format is used. The upper 8 bits of the status/ID value
are the value of the upper 8 bits of the message high register, and the lower 8
bits are the EPC-7's ULA. In this case software uses the message high regis-
ter for the event code, meaning that longword serial messages cannot be
used at the same time.
BTOE Bus timeout enable. Enables the slot-0 bus timeout timer. This is used by
the BIOS.
WDTR Watchdog timer reset enable. If 1, expiration of the watchdog timer
generates a reset of the EPC-7. If 0, only the WDT event is signaled.
FWDT Fast watchdog timer. If clear, the period of the watchdog timer is about 6.7
seconds. If set, the period is about 210 ms.
A read of the module status/control register also has a side effect of resetting the
watchdog timer. Therefore, if you are using the watchdog timer, the intention is that
you are required to read this register within the defined period of the timer to prevent
its generating an interrupt.
Signal Reg FIFO, lower
815E
Signal Reg FIFO, upper
815F
If the signal register FIFO is not empty, a read of these registers returns the oldest
value in the FIFO. The value is removed from the FIFO upon reading of the "lower"
byte (port 815E). If the FIFO is empty, the value returned is not specified.
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