2.3 Indicators
Table 2–3 ACU Indicators
Indicator
Function
Power
ON when the ACU PCB is powered
Bus Grant
ON when the ACU has VMEbus grant
Microcode
Interrupt
ON when a microcode interrupt is in progress
Any_Reg
ON during a valid ACU access over the VMEbus
DSVME
Data strobe
ASVME
Address strobe
DTACK
ACU is generating DTACK
IBUSY
ACU is master of the bus
BUSERR
When ON, a VMEbus transaction did not complete or completed with
an error. (An addressed VMEbus device did not respond within the
VMEbus timeout limit (approximately 60
sec) or returned an error
signal in response to a VMEbus access.)
MMSEL
ON when the ACU is issuing current microcode from the M machine.
(The current operation is a memory access, not a PE calculation.)
Mempty
ON when there are no pending memory operations in the M machine
IFUVAL
ON when the instruction fetch unit (IFU) is directed to a valid address.
Reasons for an invalid IFU access are:
Attempting to execute code while a refresh cycle is in progress
A page fault
Attempting to execute code while the VMEbus is talking to
instruction memory
DPU Controls and Indicators 2–11
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