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Chassis Power Inhibit Functionality
Chassis Power Inhibit Functionality
On some PXIe chassis, the controller may go into a state where the blue Status
LED on the front panel is constantly lit but the controller never boots.
- For a Keysight 18-Slot PXIe chassis, this may happen when the rear panel
- For other chassis, refer to the manufacturer's chassis documentation.
M9018 PXIe Chassis PCIe Link Configuration
This discussion is applicable when using the M9037A in slot 1 of an M9018A or
M9018B PXIe Chassis. It does not apply for use with the M9019A or M9010A
PXIe chassis, because they have a fixed configuration of 1x8 and 1x16 for their
PCIe Link fabric.
PCIe link configuration refers to how the PXIe chassis PCIe Switch Fabric is
configured to connect PCI Express signals between slot 1, the system controller
slot, and the other chassis slots. For a review of the supported PCIe link
configurations, please refer to the PXIe Chassis Family User Guide (available
from the Windows Start button, then look under Keysight).
For a detailed graphics, explaining the operation of the chassis PCIe data paths,
see the Keysight PXIe Chassis Interactive Block Diagram at
www.keysight.com/find/pxi-blockdiagram.
Keysight's M9037A embedded controller can boot and run with all of the PCIe
switch fabric configurations supported by the M9018 chassis. The supported
switch fabric configurations are:
- 1x8 Configuration — Referred to as 1x8, this configuration provides one x8 link
- 2x8 Configuration - Referred to as 2x8, this configuration provides two x8 links
Keysight M9037A PXIe Embedded Controller User Guide
Inhibited switch is set to "MAN." If the controller is stuck in this state, toggling
(pulse low for a minimum of 500 ms) the Inhibit pin (pin 5) on the DB-9
connector causes the system to reboot. Alternately, change the Inhibit switch
to the Default position and then power-on or reboot the chassis.
from the M9037A embedded controller to the PCIe switch fabric. This link is
routed by the PCIe switch fabric to all slots (2 through 18) of the M9018
chassis. While the 1x8 configuration will work with the M9037A, it is better
suited for use with the M9021A system module which supports 8 PCIe lanes.
from the M9037A embedded controller to the PCIe switch fabric. Link 1 is
routed by the PCIe switch fabric to slots 2 through 9, while Link 2 is routed to
slots 10 through18. The two x8 links provide the highest performance I/O to
the 18 chassis slots; therefore, the 2x8 configuration is recommended for use
with the M9037A.
Using the Controller
29
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