2.1 VMEbus BASE ADDRESS SELECTION
SW2
SW I
A 1 6 address range
used. (The
BASE
address is on
the
left.)
Address Bit
A15
A14
A13
A l 2 A l I
A10
A09
A08 A 0 7
A06
Switch Number
2
I
8
7
6
5
4
3
2
1
Example switch
settings for SW I and
0
0
0
0
0
0
0
0
0
0
0x0000 - 0x003F
SW2.
0
0
0
0
0
0
0
0
0
1
• 0x0040 - 0x007F
0
0
0
0
0
0
0
0
I
0
Ox0080 - 0x0OBF .
I .... OPEN or OFF
0
0
0
0
0
0
0
0
1
1
0x0000 - Ox0OFF
0 = CLOSED or ON
0
0
0
0
0
0
0
I
0
0
Ox0100 - Ox013F
...
..
...
...
..
...
.
...
I
I
1
1
1
1
I
0
1
I
OxFECO - OxFEFF
I
I
I
I
I
I
I
I
0
0
OxFFOO - 0xFF3F
I
I
1
I
I
I
I
I
0
I
0xFF40 - 0xFF7F
I
I
I
1
1
I
I
I
I
0
0xFF80 - OxFFBF
I
I
I
I
1
I
I
I
1
I
OxFPCO - OxI+I-1
Base address selection for the VMEbus requires the setting of switch SW1 (A6 thru A13) and SW2
(A14 and A15). T h e bc635VME occupies 64 bytes in the A16 address space and can be freely
located on any 64 byte boundary. The correspondence of the switch positions to the address bits is
illustrated below.
t '
I
,
To select a base address set each of the switches to the logical zero
(CLOSED
or
ON)
or the logical
one
(OPEN
or
OFF)
state.
2.2 bc3.50V2CI LOGICAL ADDRESS SELECTION
Logical Address selection for the VXlbus requires the setting of switch SW1 (A6 thru A13). The
bc350VXI occupies 64 bytes in the A 1 6 address space and can be located at any of the 256 Logical
Addresses within the VXlbus. The correspondence between the switch positions and the address
bits, and the logical state corresponding to a switch setting follows the description provided in
SECTION 2.1.
2-2
bc635VME/bc350VXI Manual
D
a
t
u
m
Inc., Bancomm Div.