Artesyn MVME5100, Programmer'S Reference Manual, Page: 174 / 318

Hawk PCI Host Bridge & Multi-Processor Interrupt Controller
MVME5100 Single Board Computer Programmer’s Reference (6806800H17B )
174
VECTOR. This vector is returned when the Interrupt Acknowledge register is examined during
a request for the interrupt associated with this vector.
2.5.3.7 Spurious Vector Register
VECTOR
This vector is returned when the Interrupt Acknowledge register is read during a spurious
vector fetch.
2.5.3.8 Timer Frequency Register
This register is used to report the frequency (in Hz) of the clock source for the global timers.
Following reset, this register contains zero. The system initialization code must initialize this
register to one-eighth the MPIC clock frequency. For the PHB implementation of the MPIC, a
typical value would be $7de290 (which is 66/8 MHz or 8.25 MHz).
Table 2-78 Spurious Vector Register
Offset $010E0
Bit
31 30 29 28 27 26 25 24 23 22 21 20 19 18 17 16 15 14 13 12 11 10 9 8 7 6 5 4 3 2 1 0
Name VECTOR
Operation R R R R/W
Reset $00 $00 $00 $FF
Table 2-79 Timer Frequency Register
Offset $010F0
Bit
31 30 29 28 27 26 25 24 23 22 21 20 19 18 17 16 15 14 13 12 11 10 9 8 7 6 5 4 3 2 1 0
Name TIMER FREQUENCY
Operation R/W
Reset $00000000