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Chapter 1
Getting Started
System Controller Slot
NI PXIe-1085 12 GB/s
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-2 x8 and a
Gen-2 x16 PCI Express link. These switches distribute PCI Express connections to the
peripheral slots and to two PCI Express-to-PCI bridges to provide PCI buses to the hybrid
peripheral slots. Refer to Figure 1-3 for an overview of the NI PXIe-1085 Series architecture.
System slot link 1 is a Gen-2 x8 PCI Express link to PCI Express switch 1, providing a nominal
bandwidth of 4 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-2 x8
PCI Express links and are downstream of system slot link 1. PCI Express-to-PCI bridge 1 is
connected to PCI Express switch 1 and provides a 32-bit, 33 MHz PCI bus for hybrid peripheral
slots 2-9.
System slot link 2 is a Gen-2 x16 PCI Express link to PCI Express switch 2, providing a nominal
bandwidth of 8 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-2
x8 PCI Express links and are downstream of system slot link 2. PCI Express-to-PCI bridge 2 is
connected to PCI Express switch 2 and provides a 32-bit, 33 MHz PCI bus for hybrid peripheral
slots 11-18.
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.
The Inhibit Mode switch on the rear of the chassis must be in the Default
Note
position for the system controller to have control of the power supply. Refer to the
Inhibit Mode Switch
about the Inhibit Mode switch.
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section of Chapter 2,
Installation and
Configuration, for details
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