Interrupt Level Switches (S2); Iack Enable Jumpers (Jl, J2) - Xycom XVME-212 Manual

XVME-212 Manual
August, 1989
Normal
Short I/O
Standard
Address
2.45

Interrupt Level Switches (S2)

The three Interrupt Level Switches select which VMEbus interrupt level is to be used by
the module. The XVME-212 can be programmed to generate an interrupt whenever a
change of state is detected on any input line, and these switches will determine the level
of that interrupt. The Interrupt Level Switches are defined in Table 2-6.
S2-3
O P E N
OPEN
O P E N
O P E N
CLOSED
CLOSED
CLOSED
2.4.6

IACK Enable Jumpers (Jl, J2)

When operating in an interrupt environment, the module uses the VMEbus IACK daisy
chain to determine which module gets acknowledged, if two or more modules share one
of the interrupt request lines. When the module is never going to be used in an interrupt
environment, the daisy chain through the module can be bypassed to speed up the IACK
arbitration. This is controlled by Jumpers Jl and J2, as shown in Table 2-7.
Module uses IACK daisy chain
Module bypasses IACK daisy chain
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Table 2-5. Address Modifier Code Options
Switches
7
8
Closed Closed
Open Closed
Closed
Open
Open Open
Table 2-6. Interrupt Level Switches (S2)
S2-2 S2-1
O P E N O P E N
O P E N
CLOSED
CLOSED OPEN
CLOSED
CLOSED
O P E N O P E N
O P E N CLOSED
CLOSED O P E N
Table 2-7. IACK Enable Jumpers
T
Jumper
J3 Address Modifier Code
B
B
A
A
VMEbus Interrupt Level
7
6
5
4
3
2
1
None, interrupts disabled
Jl
B
A
2-8
XVME-212
29H or 2DH
2DH only
39H or 3DH
3DH only
J2
B
A