Block Diagram
http://www.motorola.com/computer/literature
3-17
3
Front Panel Indicators (DS1 – DS6)
There are six LEDs on the MVME2603/2604 front panel:
CHS
,
BFL
,
CPU
,
PCI
,
FUS
, and
SYS
.
❏
CHS
(DS1, yellow). Checkstop; driven by the MPC603/604 status
lines on the MVME2603/2604. Lights when a halt condition from
the processor is detected.
❏
BFL
(DS2, yellow). Board Failure; lights when the
BRDFAIL
∗
signal
line is active.
❏
CPU
(DS3, green). CPU activity; lights when the
DBB
∗
(Data Bus
Busy) signal line on the processor bus is active.
❏
PCI
(DS4, green). PCI activity; lights when the
IRDY
∗
(Initiator
Ready) signal line on the PCI bus is active. This indicates that the
PCI mezzanine or carrier board (if installed) is active.
❏
FUS
(DS5, green). Fuse OK; lights when +5V DC, +12V DC, and
–12V DC power is available from the base board to the transition
module and remote devices.
Note
Because the
FUS
LED monitors the status of several voltages on
the MVME2603/2604, it does not directly indicate the condition
of any single fuse. If the LED flickers or goes out, check all the
fuses (polyswitches).
❏
SYS
(DS6, green). System Controller; lights when the Universe
ASIC in the MVME2603/2604 is the VMEbus system controller.