XVME-240 Manual
October, 1984
2.4 JUMPERS/SWITCHES
The DIO module has 9 jumpers and 2 sets of DIP switches. The jumpers and switches
are defined in Table 2-1.
Table 2-l.. The DIO Jumpers and Switch Definitions
Jumper
J2
,
J3, J4, J5,
J6, J7, J8,
J9,
and
Jl0
Switch Block
Sl
S2 (switches l-6)
S2 (switch 7)
S2 (switch 8)
Function
Address Space selection jumper (i.e., Short
I/O Address Space or Standard Address Space).
Interrupt input edge detection option jumpers.
Function
Selects VMEbus Interrupt Request Level for
module (11-17).
Selects Module Base Address.
This switch determines whether the module will
respond to only supervisory accesses or to both
supervisory and non-privileged accesses.
This switch works in conjunction with jumper 32
to determine whether the board operates with
address modifiers for Short I/O Address Space
or those for Standard Memory space.
2.4.l Base
Address Switches
The DIO module is designed to be addressed within either the VMEbus Short I/O or
Standard Memory Space. Since each I/O module connected to the bus must have its
own unique base address, the base addressing scheme for XVME I/O modules has been
designed to be switch (or jumper) selectable. When the DIO module is installed in the
system, it will occupy a 1K byte block of the Short I/O Memory (called the module I/O
Interface Block).
The base address decoding scheme for XYCOM I/O modules is such that the starting
address for each I/O Interface Block resides on a 1K boundary. Thus the module base
address may be set to any one of 64 possible 1K boundaries within the Short I/O
Address space.
The module base address is selected by using the switches labeled 1-6 in DIP switch
bank S2. Figure 2-2 shows the switch bank S2 and how the individual switches (l-6)
relate to the base address bits.
2-3
