National Instruments PXI EXPRESS PXIe-1095 User Manual - page 13
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Chapter 1
Getting Started
System Controller Slot
The system controller slot is Slot 1 of the chassis and is a 2-Link configuration system slot as
defined by the CompactPCI Express and PXI Express specifications. It has three system
controller expansion slots for system controller modules that are wider than one slot. These slots
allow the system controller to expand to the left to prevent the system controller from using
peripheral slots.
The backplane connects the system slot to two PCI Express switches using a Gen-3 x8 and a
Gen-3 x16 PCI Express link. These switches distribute PCI Express connections to the
peripheral slots and to a PCI Express-to-PCI bridge to provide a PCI bus to the hybrid peripheral
slots. Refer to Figure 1-3 for an overview of the PXIe-1095 architecture.
System slot link 1 is a Gen-3 x8 PCI Express link to PCI Express switch 1, providing a nominal
bandwidth of 8 GB/s (single direction) between the system controller and PCI Express switch 1.
PXI Express peripheral slots 2-10 are connected to PCI Express switch 1 with Gen-3 x8
PCI Express links and are downstream of system slot link 1. The PCI Express-to-PCI bridge is
connected to PCI Express switch 1 and provides a 32-bit, 33 MHz PCI bus for hybrid peripheral
slots 7, 8, 9, 11, and 12. PCI Express switch 1 also is connected to PCI Express switch 2 with a
Gen-3 x8 PCI Express link for advanced backplane configurations.
System slot link 2 is a Gen-3 x16 PCI Express link to PCI Express switch 2, providing a nominal
bandwidth of 16 GB/s (single direction) between the system controller slot and PCI Express
switch 2. PXI Express peripheral slots 11-18 are connected to PCI Express switch 2 with Gen-3
x8 PCI Express links and are downstream of system slot link 2.
The system controller slot also has connectivity to some PXI features such as: PXI_CLK10,
PXI Star, PXI Trigger Bus and PXI Local Bus 6.
By default, the system controller will control the power supply with the PS_ON# signals. A logic
low on this line will turn the power supply on.
Note
The chassis Inhibit Mode must be set to
Default
mode for the system
controller to control the power supply. Refer to the
Installation and Configuration
, for details about configuring Inhibit Mode.