Kontron VMOD-2D - Manual (Page 28)

VMOD-2/VMOD-2D
12/15/97
Functional Description
Page 2 - 2 Man. ID 03139, Rev. Index 0200
2. Functional Description
The VMOD-2 is a very simple and compact Modular Base-board accepting any two VMOD-
Piggyback sub-modules for user-configurable I/O in any VMEbus system. It is better suited for
use in conjunction with other VMOD-2's in a VMEbus system than the original VMOD, which
only had eight different base addresses. This chapter will describe the "physical" interfaces of
the VMOD-2, and the function of the external "local" reset interfaces.
Although this manual contains references to some VMOD piggybacks, you are asked to refer
to the piggyback's own user manuals for comprehensive and up to date information regarding
the individual piggyback products.
The VMOD-2 is designed to function as a slave module (any slot other than slot 1) in any 3U
or 6U VMEbus system. in 6U (double-height) systems it is fitted in the upper backplane con-
nector (P1, J1).
2.1 VMOD-2 Address Map
The VMOD-2 is addressed by setting appropriate jumpers for each selectable Address-line
and/or the setting of an address modifier jumper (B03) to specify the desired addressing
mode. A further jumper B16 can be set to provide increased address block widths when using
the VMOD-2 with newer piggybacks using the additional address lines A7...A11. The first pig-
gyback (upper location) is always available at the base address and the second piggyback
(lower location) is available at base address plus either offset $80/$81 or $1000/$1001, sub-
ject to selected address block widths.
All existing "VMOD" (523-xx) piggybacks use the address lines A1...A6. Any new 5230-xx pig-
gybacks (VMOD-2 only types) use not only the address lines A1...A6, but also A7...A11 which
are provided on the VMOD-2 only.
Remember!
Any existing and/or new piggybacks with a "523-" order number, can be
used on either an original VMOD or a VMOD-2, and when used on a
VMOD-2 may be used in either 256 Byte or 8 KByte address block widths.
Any new piggybacks with a "5230-" order number (only suitable for
VMOD-2 use) with the address block width of 8 KBytes. A VMOD-2 can
have a mix of old and new piggybacks fitted provided the address block
width is set for the increased 8 KByte addressing mode, i.e. jumper B16
must be set.
Via the address offsets, the user can address specific piggyback devices (i.e. SCCs) by writ-
ing to the selected VMOD-2's base address plus an offset of the appropriate value (see spe-
cific piggyback user's manual).
Example of offsets where two PB-RELs are fitted to VMOD-2.