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SM7100 Programming 25
Interrupt Control Register (0x1C) — Read and Write
D15
Scan Function done
mask bit
0 = enabled
1 = disabled
D14
Openbus Active Event
true mask bit
0 = enabled
1 = disabled
D13-D9 Unused Data written to these bits has no effect
D8 Module Busy Complete
0 = enabled
1 = disabled
D7 IR ENA*
0 = writing a 0 to this bit enables interrupter capabilities
1 = writing a 1 to this bit disables interrupter capabilities
D6 IH ENA*
The module has no interrupt handler capability; therefore writing a 1 or
0 has no effect. A 1 is always read back for this bit.
D5-D3 Interrupter IRQ Line
The complement of the value programmed into these three bits reflects
the selected IRQ line used by the module. A value of 011
2
would select
IRQ4, a value of 000
2
would select IRQ7, and a value of 111
2
would
disconnect the IRQ lines.
D2-D0 Handler IRQ Line
The module has no interrupt handler capability; therefore writing to
these bits has no effect. A 111
2
is always read back for these bits.
Note that all bits in this register are set to 1 upon receipt of a hard or soft reset.
Subclass Register (0x1E) — Read Only
D15
VXIbus Extended
Device
Always reads as 1.
D14-D0
Extended Memory
Device
Always reads as 7FFD
16
NVM Access Resister (0x20) — Read Only
D15-D1 Unused All Bits are always 1.
D0
Reads back the serial data stream from the selected SMIP II board.
Note that only one SMIP II board may be read back at a time.
NVM Access Resister (0x20) — Write Only
D15-D2 Unused Data written to these bits have no effect.
D1 Serial clock for the switch module; should be a logic 1 when not used.
D0
Serial data input for the switch module; must be a logic 1 when not
used.
Board X, Y Used Address Register (0x22, 0x24, 0x26) — Read and Write
D15-D8
Sets the actual number of words of address space used by the relays on
board's X.
D7-D0
Sets the actual number of words of address space used by the relays on
board's Y.