500-003111-000
5-6
5.4.2
Board Address and Address Modifier Selection
Jumper blocks J36 and J37 permit the VMIVME-3111 board to be located
on any 32-byte boundary within the short I/O address space available from the
VMEbus (see Sections 3 and 4). Operation in the short I/O address space requires
that 15 address lines be decoded to access all locations. Since four lines are used
for decoding on-board functions (Section 4), the VMIVME-3111 board's address is
defined by 11 lines; address bits A05 through A15.
The board address is programmed by installing shorting plugs at all "zero"
or LOW address bit positions in the jumper blocks J36 and J37, and by omitting the
shorting plugs at the "one" or HIGH positions. Address bit A05 has a weight of 32-
byte locations. As an example, the jumper arrangement shown in Table 5.4.2-1
would produce a board address of XXXX8F00 HEX. Address bits XXXX are CPU
dependent.
I/O ACCESS MODE is programmed by selecting the value of the address
modifier bit AM2 with jumper J37-3. Short nonprivileged access is selected by
installing the jumper. Short supervisory access is selected by omitting the jumper.
Table 5.4.2-1. Typical Board Address (FF8F00 HEX) Selection
JUMPER
ADR BIT
STATE*
J37-0
J37-1
J37-2
J36-0
J36-1
J36-2
J36-3
J36-4
J36-5
J36-6
J36-7
A05
A06
A07
A08
A09
A10
A11
A12
A13
A14
A15
SHORTED
SHORTED
SHORTED
OPEN
OPEN
OPEN
OPEN
SHORTED
SHORTED
SHORTED
OPEN
M3111/T5.4.2-1
*SHORTED = "ZERO."
OPEN = "ONE."
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