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EPC-9 Hardware Reference
E
E
E-4
WDTR
Watchdog timer reset enable. If 1, expiration of the watchdog timer
causes a reset. If 0, only the WDT event is signaled. A read of the
this register should be performed before enabling the watchdog timer
reset. This clears the watchdog counter to zero so that a PC reset does
not occur immediately after enabling the watchdog timer.
WDTV
Watchdog timer value. This field produces the following time-out
values: 00 - disables events from the watchdog timer, 01 - 8.2 s, 10 -
128ms, 11 - 1.02 s.
A read of the this register also has a side effect of resetting the watchdog timer.
Therefore, if using the watchdog timer, it is required to read this register within the
defined period of the timer to prevent generating an interrupt.
ULA (8151h
ULA[7..0]
8151h
This register is set to all 1’s by a PCI reset.
The ULA register is an 8-bit value that represents the Unique Logical Address of the
VXI registers. This register is driven onto the VME bus D[7:0] during an IACK
response cycle. VME D[15:8] is driven from the lower 8 bits of the Message Low
register. ULA is only readable from this port. It is written when accessed from the
VME port at offset 0.
VME Event Register (8152h)
11111
MSGE
SIGE
WDTE
8152h
This register defines conditions that may result in an interrupt. If the bit is 0, the
condition is present.
WDTE Watchdog timer expired
SIGE
Signal FIFO is not empty.
MSGE If clear, a message interrupt is being signaled. MSGE is cleared if both of
bits RRDY and WRDY in the response register are clear.
All bits are read-only.
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