6.3 Replacing DPU Card Cage PCBs
Table 6–1 ACU Jumper Settings
Jumper Function
Factory Setting
ACU VMEbus address
0xFCC000000
ACU VMEbus interrupt request level
Level 1
ACU VMEbus interrupt acknowledge
level
Level 1
Independent scan path selection from the
server (for diagnostics only)
Off
Selection of ACU as a VMEbus arbiter
ACU VMEbus arbiter selected
16-bit or 32-bit word selection for ACU
instruction DMA
32-bit
Block or pipelined mode for ACU
instruction DMA
Pipelined
IMem size
1 MB
ACU PCB clock enable/disable
Enabled
Figure 6–5 ACU Jumpers
R
F
D
A
IMem Size
Clock
Enable
VMEbus Interrupt Request Level
VMEbus Interrupt Acknowledge Level
A[31:26]
A[23:14] & [12:10]
BC
GHJKL MNP
AAA A A AAAAAA AAA
R
F
D
ABC
G HJKL MNP
E
Backplane Connectors
Serial Scan Path
Note: Darkened Jumpers
are INSTALLED.
Crystal
Oscillator
MKV-040000314-38-MPS
6–8 Removal and Replacement Procedures
