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3.3 ILEGACY
The ILEGACY switch is used to select between standard SP3 interrupt connections and support for legacy
interrupt connections.
ILEGACY
SW2-3
On (right)
Off (left)
Legacy Sandpoint 1/2 Interrupt Modes
3.3.1 IMODE
The IMODE switches are connected to the SPF FPGA to configure the PCI interrupt connections.
IMODE[0:1]
SW2-4
SW2-5
On (right)
On (right)
On (right)
Off (left)
Off (left)
On (right)
Off (left)
Off (left)
3.3.1.1 IMODE Serial
When IMODE is set such that Serial is selected, the SPF100 enables an internal serial multiplexer that works
with the serial demultiplexer in the EPIC portion of the MPC107 or MPC824X on MPMC cards. This allows
many interrupts to be conveyed to the MPMC than would normally be possible with the four allocated pins.
shows the serial 'slot' corresponding to each external interrupt
Table 13. Sandpoint 3 Serial Interrupt Slot Assignment
Slot
0
1
2
3
4
5
6
MOTOROLA
Table 11. Sandpoint 3 ILEGACY Switches
Definition
Standard SP3 Interrupt Modes
Table 12. Sandpoint 3 IMode Switches
Definition
Interrupt Source
SIOINT
reserved
SLOT #1
SLOT #2
SLOT #3
SLOT #4
WinBond INTA#
Default
See Appendix B
Serial
Wire-OR
Slot
reserved
Inverted, so active low
reserved
INTA# from each slot.
No specific function
Notes
Notes
Default.
Not available on all systems.
Note
13
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