SIS Documentation
SIS3800
Scaler/Counter
Page 12 of 39
7 VME
addressing
7.1 Address
Space
As bit 11 is the lowest settable bit on the 360x/38xx board, an address space of 2 Kbytes
(Offset plus 0x000 to 0x7ff) is occupied by the module.
7.2 Base
Address
7.2.1 VME
The VME addressing mode (A16/A24/A32) is selected via the jumpers EN_A16, EN_A24
and EN_A32.The mode is selected by closing the corresponding jumper, it is possible to
enable two or all three addressing modes simultaneously.
The base address is set via the five rotary switches SW_A32U, SW_A32L, SW_A24U,
SW_A24L and SW_A16 and the jumper J_A11. The table below lists the switches and
jumpers and their corresponding address bits.
Switch/Jumper
Affected Bits
SW_A32U
31-28
SW_A32L
27-24
SW_A24U
23-20
SW_A24L
19-16
SW_A16
15-12
J_A11
11
In the table below you can see, which jumpers and switches are used for address decoding in
the three different addressing modes (fields marked with an x are used).
SW_A32U
SW_A32L
SW_A24U
SW_A24L
SW_A16
J_A11
A32
x
x
x
x
x
x
A24
x
x
x
x
A16
x
x
Note: J_A11 closed represents a 0, J_A11 open a one
7.2.2 VIPA/VME64x
As the VME64x and the VME64xP (VIPA) standard are not yet standards to refer to and to
declare conformity with, addressing modes (like geographical addressing e.g.) according to
these standards are prepared but not yet implemented in the current firmware revisions.
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