1260-00C User Manual
Operation 3-15
The SYSFAIL LED is lit whenever any device in the system is
asserting the VXIbus SYSFAIL* signal.
The ACCESS LED flashes whenever the 1260-00C is accessed
from the GPIB, or from the VXIbus. It also indicates when its
MODID is asserted.
Self-Test Operation
The self-test sequence tests the basic functionality of many
1260-00C components, including EPROM, RAM, I
2
C bus, RS-232
port, DMA channels, GPIB port, interrupt logic, timer, and VXIbus
registers (MIGA). You can execute full tests of the 1260-00C in
diagnostics mode, as described in Chapter 6.
RM Operation
The RM waits until all devices have stopped driving the VXIbus
SYSFAIL* signal, or until five seconds have elapsed after the
VXIbus SYSRESET* signal is negated. During this period, all
VXIbus devices in the system should have completed their
self-tests.
NOTE
Configure the 1260-00C to wait for any number of
seconds before RM operations begin.
The RM scans Logical Addresses 1 through 254 for Static
Configuration Devices (SC Devices). For each SC device found, it
reads the device class and manufacturer's ID code from the ID
Register, and the model code from the Device Type Register. If
the device is an extended device, the RM reads its Subclass
Register. The RM then performs slot associations for each static
configuration device by reading its Status Register while asserting
each MODID line.
The RM looks for Dynamic Configuration Devices (DC Devices) at
Logical Address 255 by asserting each MODID line and reading
the device's ID Register. DC devices initially have a logical
address of 255. The RM subsequently assigns each DC device a
different logical address. For each DC device found, it not only
reads the device's configuration registers as with SC devices, but
also assigns each device the next unused logical address by
writing the appropriate value to the device's Logical Address
Register. Using the non-volatile configuration mode, set the
starting logical address for the RM to begin assigning DC devices.
Refer to Chapter 5 for more information on non-volatile
configuration.
If any device has not passed its self-test, the RM forces that
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