Model 466-1 Adapter
40 VMEbus Adapter Card Configuration
Make sure the
Bias
jumpers are set so that an access does not map through
to the VMEbus and back into the adapter card. For example, a loopback into
Dual Port RAM causes a conflict and stops adapter operations.
You may also use the card in Page Mode, where the upper 12 - 16 VMEbus
address bits are supplied by a Page Register on the VMEbus adapter card.
See section 1.9.
In the
Bias
jumper block, the middle column pins connect through a buffer to
drive the VMEbus address lines A31-A16. All right column pins are
grounded. The left column pins 16-31 are the address bits from the SBus
adapter card.
Jumper RIGHT:
------- (Bit is "0")
Jumper LEFT:
-----
(Bit is passed through)
Jumper OUT:
(Bit is "1")
31
-------
Passes A31 to the VMEbus
30
-------
Passes A30 to the VMEbus
29
-------
Passes A29 to the VMEbus
28
-------
Passes A28 to the VMEbus
27
-------
Passes A27 to the VMEbus
26
-------
Passes A26 to the VMEbus
25
-------
Passes A25 to the VMEbus
24
-------
Passes A24 to the VMEbus
23
-------
Passes A23 to the VMEbus
22
-------
Passes A22 to the VMEbus
21
-------
Passes A21 to the VMEbus
20
-------
Passes A20 to the VMEbus
19
-------
Passes A19 to the VMEbus
18
-------
Passes A18 to the VMEbus
17
-------
Passes A17 to the VMEbus
16
-------
Passes A16 to the VMEbus
Bias
In the diagram above, all addresses from the SBus are passed through to the
VMEbus.
Содержание 466-1
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