Kontron VMOD-2D - Manual (Page 30)

VMOD-2/VMOD-2D
12/15/97
Functional Description
Page 2 - 4 Man. ID 03139, Rev. Index 0200
ommend the jumper B16 is removed, which will ensure that your software will address both
piggybacks correctly without any need of modification.
Special note!
The user's manuals for various piggybacks currently in existence, will
continue to give details of their address offsets based on the 256 Byte
address block spacing as described above. You can of course use the
new 8 KByte spacing with all "523-xx" piggybacks, by simply increasing
the offset from $80/$81 to $1000/$1001 for piggyback location B.
2.1.2 Address Range of the VMOD-2
Using the address widths given before, you are able to select from either thirty-two 256 Byte
wide addresses, or from eight 8 KByte wide addresses,. i.e. your system can have 32 or eight
VMOD-2s fitted subject to your address configurations. The address selection is acheived by
decoding the state of five jumpers, B2, B12, B13, B14 and B15. Where a jumper Set returns a
logical 0 for the respective address line and a jumper Open returns a logical 1 for the respec-
tive address line.
A full listing with all address setting permutations is given in section 3.1.6.
2.2 VMEbus Interrupts
2.2.1 Interrupt Generation on the VMOD-2
Each piggyback on the VMOD-2 is able to request/generate interrupts between levels 1 to 7.
However the VMOD-2 will only be set for one level of interrupt for use on the VMEbus.
For each request from piggybacks, INT0* for piggyback location "A" and INT1* for "B", there is
an acknowledge signal, INTA0* and INTA1* respectively. If two simultaneous interrupts are
detected, the one which is first will disable any handling of the other until its been dealt with
itself.
2.2.2 Interrupt Level Setting
As mentioned above the user can set his VMOD-2 to use any IRQ level from 1 to 7 as appro-
priate to his VMEbus systems application. The selection of these levels is subject to the set-
Table 2-2:Address Block Widths According to Jumper B16 Setting
Jumper B16 Setting Set Open
VMOD-2's Address Block Width 8 KByte 256 Byte
Upper Piggybacks address offset $00/$01 $00/$01
Lower Piggybacks address offset $1000/$1001 $80/$81
Address lines available to piggy-
backs A1.....A11 A1....A6