National Instruments MXI-Express Gen-3 x16 Bedienungsanleitung

USER MANUAL

MXI-Express Gen-3 x16

MXI-Express Gen-3 x16 Multisystem eXtension Interface for PCI

Express, CompactPCI Express, and PXI Express Bus Systems

This document provides installation, configuration, and reference information for MXI-

Express Gen-3 x16 controllers.

Caution This icon denotes a caution, which advises you of precautions to take to

avoid injury, loss of data, or a system crash.

Caution Using the MXI-Express Gen-3 x16 controllers in a manner not described

in this document may impair the protection the controllers provide.

Contents

Overview...................................................................................................................................2

Description and Features...........................................................................................................3

Functional Block Diagram........................................................................................................ 4

Basic MXI-Express Gen-3 x16 Systems...................................................................................6

Larger MXI-Express Gen-3 x16 Systems.................................................................................7

Connection Options...................................................................................................................8

Compatibility with Host PCs.................................................................................................. 10

Installation and Configuration.................................................................................................11

Equipment Needed.......................................................................................................... 11

Unpacking............................................................................................................................... 11

Hardware Installation..............................................................................................................12

Installing a PCIe-8398.................................................................................................... 12

Installing the Low-Profile Bracket on the PCIe-8398 (Optional)...................................13

Installing a PXIe-8398, PXIe-8399, or PXIe-8394.........................................................14

Cabling............................................................................................................................ 16

Powering On the MXI-Express Gen-3 x16 System........................................................ 17

Powering Off the MXI-Express Gen-3 x16 System....................................................... 17

LED Indicators........................................................................................................................18

PXI Express Onboard LEDs........................................................................................... 19

PCIe-8398 Onboard LEDs.............................................................................................. 21

Software Installation and Configuration................................................................................. 22

Specifications.......................................................................................................................... 23

PCIe-8398 (156877x-01L) Specifications...................................................................... 23

PXIe-8398 (156874x-01L) Specifications...................................................................... 26

PXIe-8399 (156874x-02L) Specifications...................................................................... 29

PXIe-8394 (156874x-04L) Specifications...................................................................... 32

Common Questions.................................................................................................................35

General Hardware........................................................................................................... 35

MXI-Express Gen-3 x16 Upgrade Questions................................................................. 36

General Software.............................................................................................................36

Documentation Notice for Third Party Software....................................................................37

Overview

Gen-3 MXI-Express is based on off-the-shelf PCI Express technologies. A Gen-3 MXI-

Express module can control PXI Express or CompactPCI Express chassis from a PC or a PXI

Express or CompactPCI Express chassis. The architecture is transparent to device drivers, so

no additional software is needed for PXI Express devices installed in connected chassis.

Note For full PXI/PXI Express functionality such as chassis and controller

identification, trigger routing, and slot detection, install the PXI Platform Services

software included with your kit. You also can find this software at ni.com/

updates by searching for PXI Platform Services.

The basic PCI Express lane consists of dual unidirectional differential links implemented as

one transmit pair and one receive pair. The link between the PC and chassis can be up to 16

lanes wide and supports speeds up to PCI Express Gen-3.

The following table lists the signaling rate of each PCI Express generation.

Table 1. PXI Express Generation Signaling Rates

PCI Express Generation Signaling Rate

First 2.5 Gb/s/lane/direction of raw bandwidth

Second 5.0 Gb/s/lane/direction of raw bandwidth

Third 8.0 Gb/s/lane/direction of raw bandwidth

Note This link is compatible with the cabled PCI Express specification developed

by the PCI-SIG.

2| ni.com | MXI-Express Gen-3 x16 User Manual

Description and Features

MXI-Express Gen-3 x16 extends PCI Express communication over a cable up to 3 m. With

MXI-Express Gen-3 x16, you can do the following:

• Control a PXI Express or CompactPCI Express backplane with a PCI Express-based PC.

• Physically separate the measurement or automation system from a host PC.

• Control multiple PXI Express or CompactPCI Express chassis with a single PCI Express-

based PC or PXI Express embedded controller. (The PXIe-8398 and PXIe-8399

controllers also can control multiple chassis in a daisy-chain configuration.)

The following table lists the models and their features for comparison.

Table 2. Feature Comparison of Available MXI-Express Gen-3 x16 Interfaces

Model Slot Type Number of Lanes Cable Support

PCIe-8398 PCI Express Gen-3 x16 16 MXI-Express x8

PXIe-8394 PXI Express Peripheral

Expansion Module

16 MXI-Express x8,

MXI-Express x4

PXIe-8398 PXI Express Controller 16 MXI-Express x8,

MXI-Express x4

PXIe-8399 PXI Express Controller

With One Expansion Slot

32 MXI-Express x8,

MXI-Express x4

Tip For optimum link widths and performance, use the PXIe-8394, PXIe-8398, and

PXIe-8399 in chassis that support Gen 3 links.

MXI-Express Gen-3 x16 User Manual | © National Instruments | 3

Functional Block Diagram

Figure 1. PCIe-8398 (156877x-01L) Block Diagram

MXI-Express

Gen-3 x16

PWR/LNK

Status LED

PCI Express Gen-3 x16

PCI Express

Switch

4| ni.com | MXI-Express Gen-3 x16 User Manual

Figure 2. PXIe-8398 (156874x-01L) and PXIe-8399 (156874x-02L) Block Diagram

MXI-Express

Gen-3 x16

PCI Express Gen-3 x16

PCI Express Gen-3 x4

PCI Express

PCI Bridge

SMBus

Master

PCI Express

Switch

Note The width and speed of the PXI Express backplane links are chassis

dependent.

The PXIe-8398 and PXIe-8399 work in both two and four-link chassis. A four-link chassis

supports four links up to x4 width each, for a maximum of 16 PCI Express lanes. A two-link

chassis supports one link up to x8 and a second link up to x16, for a maximum of 24 PCI

Express lanes. The PXIe-8398 and PXIe-8399 maximize the use of all available backplane

lanes for either configuration.

Note National Instruments offers Gen 3 PXI Express chassis that allow the

PXIe-8398 and PXIe-8399 to establish Gen 3 backplane links.

MXI-Express Gen-3 x16 User Manual | © National Instruments | 5

Figure 3. PXIe-8394 (156874x-04L) Block Diagram

PCI Express

Switch

PCI Express Gen-3 x16

PCI Express Gen-3 x8

MXI-Express

Gen-3 x16

Note The width and speed of the PXIe-8394 backplane links are chassis

dependent.

Note National Instruments offers Gen 3 PXI Express chassis that allow the

PXIe-8394 to establish Gen 3 backplane links. A chassis can support up to a x8 link.

Basic MXI-Express Gen-3 x16 Systems

The simplest MXI-Express Gen-3 x16 system consists of a PCIe-8398 in a PC connected to a

PXIe-8398 in the controller slot of a PXI Express chassis, as shown in the following figure.

Figure 4. Example of a Basic MXI-Express Gen-3 x16 Link Topology

Note In this manual, whenever a PXI Express chassis is referenced, you could use

a CompactPCI Express chassis instead.

6| ni.com | MXI-Express Gen-3 x16 User Manual

Larger MXI-Express Gen-3 x16 Systems

There are several ways to connect multiple chassis to a host system. Which you choose

depends on your design goals and requirements.

If you are using a PC to control the chassis, and if multiple x16 PCI Express slots are available

in the host PC, you can use multiple PCIe-8398 modules to connect to the PXIe-8398 in each

chassis ("star" topology). This method offers the most bandwidth and lowest latency to the

host for all the chassis.

Figure 5. Example of a Star MXI-Express Gen-3 x16 System Expansion Topology

If you are using a PC to control multiple chassis but do not have additional PCI Express slots

in the PC, you can use a PXIe-8399 to daisy-chain to an additional chassis ("daisy-chain"

topology). The PXIe-8399 supports two x16 links on its front panel, and you can connect the

second link to an additional chassis. For example, you could set up two chassis using a

PCIe-8398 in the host PC cabled to a PXIe-8399 in the first chassis. The PXIe-8399 in the first

chassis would also be cabled to a PXIe-8398 in the second chassis. If a third chassis is desired,

the second chassis could use another PXIe-8399.

MXI-Express Gen-3 x16 User Manual | © National Instruments | 7

Figure 6. Example of a Daisy-Chain MXI-Express Gen-3 x16 System Expansion

Topology

If you are using an embedded controller, you can use a PXIe-8394 to expand to additional

chassis. As with a PC host, you can use a PXIe-8394 card per additional chassis (preferred), or

you can daisy-chain additional chassis using the PXIe-8399. The PXIe-8394 backplane

connection is limited to Gen 3 x8.

Figure 7. Example of a MXI-Express Gen-3 x16 System Expansion Topology Using a

PXIe-8394 in Each Chassis

Systems need not be exclusively star or daisy-chain. It is generally preferable to use a star

topology, but you can daisy-chain or star additional chassis as needed. There are additional

choices, described in the next section, if the full x16 bandwidth is not required.

Connection Options

The MXI-Express Gen-3 x16 connectors are modular and can be cabled in several

configurations. The hardware makes the configurations without user intervention. The

8| ni.com | MXI-Express Gen-3 x16 User Manual

configuration mechanism requires PCI Express cables, not the connector-compatible cables

that other standards use. When multiple cables are used for a single link, the cables must be

the same length.

Note National Instruments offers x8 cables. x16 connections require two cables,

and the cables must connect the ports in ascending order. For example, ports 1-2 of a

PCIe-8398 will connect to ports 1-2 of a PXIe-8398, and ports 3-4 will connect to

3-4.

For the PXIe-8399, connect daisy-chain ports 5 and 6 to ports 1 and 2 on the PXIe-8398 or

PXIe-8399.

Figure 8. Connection Options

PXIe-8399 PXIe-8398 PXIe-8394

PCIe-8398

PXIe-8399 PXIe-8398 PXIe-8394

PWR/

LINK

PWR/

LINK

PWR/

LINK

PWR/

LINK

PWR/

LINK

MXI-Express MXI-Express MXI-Express

Port 1 of the PXIe-8398 and PXIe-8399 is upstream facing, meaning it is the link going toward

the host. This means it is connected to a PXIe-8394, PCIe-8398, or a downstream facing port

of a PXIe-8398 or PXIe-8399.

MXI-Express Gen-3 x16 User Manual | © National Instruments | 9

Ports 1-4 ordinarily are cabled to the host PC or the chassis containing the embedded

controller. In this configuration, ports 1-4 form a x16 link, offering the highest throughput.

Ports 5-8 of a PXIe-8399 and ports 1-4 of a PXIe-8394 and PCIe-8398 are always downstream

facing, meaning they may be connected only to additional chassis that are farther from the

host. They ordinarily are connected to a single PXIe-8398 or PXIe-8399.

Ports 2, 3, and 4 of the PXIe-8398 and PXIe-8399 are upstream facing by default, but they

change direction based on cabling. While they are normally used (along with port 1) to form a

x16 upstream link, they may alternatively be connected to additional chassis, and they become

downstream facing ports. There can be only one upstream facing link per chassis, but it may

comprise one, two, or four ports to form a x4, x8, or x16 link.

The following table lists possible configurations.

Module Configuration 1 Configuration 2 Configuration 3 Configuration 4

PCIe-8398 1-4: x16 1-2: x8

3-4: x8

— —

PXIe-8394,

PXIe-8398,

PXIe-8399

ports 1-4

1-4: x16 1-2: x8

3-4: x8

1-2: x8

3: x4

4: x4

1: x4

2: x4

3: x4

4: x4

PXIe-8399

ports 5-8

5-8: x16 5-6: x8

7-8: x8

5-6: x8

7: x4

8: x4

5: x4

6: x4

7: x4

8: x4

The flexible port configurations allow you to prioritize bandwidth (Configuration 1), high

fanout (Configuration 4), or a blend of the two.

Compatibility with Host PCs

The BIOS of some host computers may have limited support or no support for extending the

PCI Express fabric. These systems may fail to boot or fail to function correctly.

For more information about host system compatibility with MXI-Express Gen-3 x16 products,

refer to the NI Developer Zone document Tips to Help You Successfully Use NI MXI-Express

Controllers at ni.com.

10 | ni.com | MXI-Express Gen-3 x16 User Manual

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