AcQuisition Technology Quad M-module Carrier i4000 Hardware Handleiding - Pagina 7

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3.

VMEbus interface

3.1. Address interface

The i4000 can be selected to accept either short addressing, using 16 bit addresses
(A16) or standard addressing, using 24 bit addresses (A24).
When using short addressing up to 32 i4000 boards can be put in a single VMEbus
system since the lower 11 address lines (A0-A10) are used internally on the i4000. If
standard addressing is used, a larger address space is available to select the board.
The memory space occupied by the i4000 is $800 bytes long. This memory space is
equally spread across the four modules. so each module occupies $200 bytes. From
these $200 bytes address space half is used by the interrupt controller. The address
space for each module is therefore $100 bytes long (8 bit addressing).
The address space of the i4000 is selectable using dip switches (SW1 and SW2) which
are accessible even when the four module slots are occupied. When a switch is "on" the
corresponding address line is a logical "zero" and when a switch is "off" the
corresponding address line is "one".
Address modifier AM4 can be used to select either standard or short memory
addressing. If AM4 is "one" (the switch is in the off position) standard addressing is
selected. If AM4 is "zero" (switch on) short addressing is selected. When using short
addressing the address lines A16-A23 are don't cares.
Figure 2 Address Selection
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P.O. Box 627, 5340 AP OSS, The Netherlands
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off
on
1
off
A23
2
on
A22
A21
3
on
4
A20
off
SW1
on
A19
5
6
on
A18
A17
7
on
on
A16
8
on
A15
1
on
2
A14
on
A13
3
SW2
on
A12
4
on
A11
5
AM4
6
off
i4000 - Quad M-module Carrier for VMEbus-
EXAMPLE:
Base Address $900000
(standard address space)
I4000-swa
Tel: +31 412 651055
Fax: +31 412 651050