Keysight M9021A, Installation Manual

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Keysight PXIe System and Cable Interface Installation Guide 27
M9022A, M9023A, M9024A System Module Installation
M9022A, M9023A, M9024A System Module Installation
Understanding Features Controlled by Switch Settings
Mode Settings
The Mode settings, Host and Target, do not apply to the M9022A because it has
only one PCIe port on the front panel (always in Target Mode).
The M9023A and M9024A are Dual Port System Modules.
PCIe Port 1 is always a “target,” but the PCIe Port 2 can be configured via switch
settings to be either ‘host” or “target.” The default setting for the PCIe Port 2 is
“host.”
Mode Host (default) x8
The top port (PCIe Port 1) is always connected to the upstream device (that is,
the device closest to the computer); for example when the upstream device is a
PC, PCIe Port 1 is the target. In the default configuration the PCIe Port 2
connects to a downstream device; for example when the downstream device is a
chassis, PCIe Port 2 is the host. Both of these connections will use a single 8 lane
PCIe cable. See Figure 19 on page 40 for an example PCIe cable topography that
uses this configuration.
Mode Target x16
The mode “target” is possible via switch settings. In this mode PCIe Port 2
connects to a upstream device. There are no downstream devices. This mode is
used to achieve maximum bandwidth between a chassis and a PC.
With two x8 PCIe cables working in parallel, the total number of lanes of
communication is 16. See Figure 17 on page 38 for an example of a PCIe cable
topology that uses this configuration. Note that when two cables are connecting
a PC to chassis, the top cable connector on PC host adapters must be connected
to the top (PCIe Port 1) on the M9023A or M9024A. Likewise, the bottom two
ports must connected to each other.
Port 1 Port 2 Application
Target Host (default) x8, Single PCIe cable to chassis, Multi-chassis Cascade,
Multi-chassis Star
Target Target x16, two PCIe Cables to chassis, Star Multi-chassis