National Instruments NI PXIe-1082 Manuale utente

INSTALLATION GUIDE

8-Slot NI PXIe-1082 Backplane

This guide describes installation requirements for the 8-slot NI PXIe-1082

backplane.

Contents

NI PXIe-1082 Backplane Overview ....................................................... 2

Interoperability with CompactPCI................................................... 3

System Controller Slot..................................................................... 3

Hybrid Peripheral Slots.................................................................... 4

PXI Express Peripheral Slots........................................................... 4

System Timing Slot ......................................................................... 4

PXI Local Bus.................................................................................. 6

PXI Trigger Bus............................................................................... 6

System Reference Clock.................................................................. 7

PXIe_SYNC_CTRL ........................................................................ 9

Mechanical Requirements....................................................................... 10

Mounting.......................................................................................... 10

Dimensions ...................................................................................... 11

Cooling............................................................................................. 11

Handling.................................................................................................. 12

Electrical Requirements .......................................................................... 13

PXI Connectors................................................................................ 13

Power ............................................................................................... 14

Connector J37 ........................................................................... 14

Connector J36 ........................................................................... 16

Connector J35 ........................................................................... 16

Connectors J2, J3, and J4.......................................................... 17

Backplane Specifications................................................................. 17

System Synchronization Clock (PXI_CLK10, PXIe_CLK100,

PXIe_SYNC100) Specifications................................................... 18

10 MHz System Reference Clock: PXI_CLK10...................... 18

100 MHz System Reference Clock: PXIe_CLK100 and

PXIe_SYNC100 .................................................................... 18

External Clock Source .............................................................. 19

8-Slot NI PXIe-1082 Backplane Installation Guide 2 ni.com

PXIe_SYNC_CTRL..................................................................19

PXI Differential Star Triggers (PXIe-DSTARA,

PXIe-DSTARB, PXIe-DSTARC) ..........................................19

Pinouts .....................................................................................................20

System Controller Slot Pinouts ........................................................21

System Timing Slot Pinouts .............................................................22

Hybrid Slot Pinouts ..........................................................................23

NI PXIe-1082 Backplane Overview

This section provides an overview of the backplane features for the

NI PXIe-1082 chassis. Figure 1 shows the backplane.

Figure 1. 8-Slot NI PXIe-1082 Backplane

©National Instruments 3 8-Slot NI PXIe-1082 Backplane Installation Guide

Interoperability with CompactPCI

With the NI PXIe-1082, you can use the following devices in a single

PXI Express system:

• PXI Express-compatible products

• CompactPCI Express-compatible 4-Link system controller products

• CompactPCI Express-compatible Type-2 peripheral products

• Hybrid-compatible PXI peripheral products

• Standard CompactPCI peripheral products

Figure 2. NI PXIe-1082 Backplane Architecture

System Controller Slot

The system controller slot is Slot 1 of the chassis and is a 4-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 routes the first x4 PCI Express link from the system slot

directly to slot 2. The other three x4 PCI Express links each are routed

from the system slot to a PCI Express switch. The three PCI Express

switches have x4 PCI Express links routed to each remaining peripheral

Link #2

HHHH

12 3 4 5 6 7 8

PCIe/PCI

Bridge

PLX

PEX8612

PCIe Switch

Link #3

Link #4

Link #1

PLX

PEX8612

PCIe Switch

PLX

PEX8616

PCIe Switch

x4 x4 x4

8-Slot NI PXIe-1082 Backplane Installation Guide 4 ni.com

slot. One PCI Express switch also has a x1 PCI Express link routed to a

PCI Express-to-PCI bridge that provides a 32-bit, 33 MHz PCI bus to the

four hybrid slots. Refer to Figure 2 for the connectivity of PCI Express

and PCI.

By default, the system controller controls the power supply with the

PS_ON# signals. A logic low on this line turns on the power supply.

Hybrid Peripheral Slots

The backplane includes four hybrid peripheral slots as defined by the PXI-5

PXI Express Hardware Specification: slots 5 to 8. A hybrid peripheral slot

can accept the following peripheral modules:

• A PXI Express peripheral with a x4 or x1 PCI Express link to the

system slot or through a switch to the system slot.

• A CompactPCI Express Type-2 peripheral with a x4 or x1 PCI Express

link to the system slot or through a switch to the system slot.

• A hybrid-compatible PXI peripheral module modified by replacing the

J2 connector with an XJ4 connector installed in the upper eight rows

of J2. Refer to the PXI Express Specification for details. The PXI

peripheral communicates through the backplane 32-bit PCI bus.

• A CompactPCI 32-bit peripheral on the backplane 32-bit PCI bus.

The hybrid peripheral slots provide full PXI Express functionality and

32-bit PXI functionality except for PXI Local Bus. The hybrid peripheral

slot connects only to PXI Local Bus 6 left and right.

PXI Express Peripheral Slots

There are two PXI Express peripheral slots: slots 2 and 3. PXI Express

peripheral slots can accept the following modules:

• A PXI Express peripheral with a x4 or x1 PCI Express link to the

system slot or through a switch to the system slot.

• A CompactPCI Express Type-2 peripheral with a x4 or x1 PCI Express

link to the system slot or through a switch to the system slot.

System Timing Slot

The system timing slot is slot 4. The system timing slot accepts the

following peripheral modules:

• A PXI Express system timing module with a x4 or x1 PCI Express link

to the system slot through a PCI Express switch.

• A PXI Express peripheral with a x4 or x1 PCI Express link to the

system slot through a PCI Express switch.

• A CompactPCI Express Type-2 peripheral with a x4 or x1 PCI Express

link to the system slot through a PCI Express switch.

©National Instruments 5 8-Slot NI PXIe-1082 Backplane Installation Guide

The system timing slot has three dedicated differential pairs

(PXIe_DSTAR) connected from the TP2 connector to the XP3 connector

for each PXI Express peripheral or hybrid peripheral slot, as well as routed

back to the XP3 connector of the system timing slot, as shown in Figure 3.

You can use the PXIe_DSTAR pairs for high-speed triggering,

synchronization, and clocking. Refer to the PXI Express Specification

for details.

The system timing slot also has a single-ended (PXI Star) trigger connected

to every slot. Refer to Figure 3 for details.

The system timing slot has a pin (PXI_CLK10_IN) through which a system

timing module can source a 10 MHz clock to which the backplane

phase-locks. Refer to the System Reference Clock section for details.

The system timing slot has a pin (PXIe_SYNC_CTRL) through which a

system timing module can control the PXIe_SYNC100 timing. Refer to the

PXI Express Specification and the PXIe_SYNC_CTRL section for details.

Figure 3. PXIe_DSTAR and PXI Star Connectivity Diagram

12 3

PXIe_DSTAR0

PXIe_DSTAR1PXIe_DSTAR1

PXIe_DSTAR2

PXIe_DSTAR1

PXIe_DSTAR8

PXIe_DSTAR9

PXIe_DSTAR10

PXIe_DSTAR11

PXI_STAR1

PXI_STAR0

PXI_STAR2

PXI_STAR3

PXI_STAR4

PXI_STAR5

PXI_STAR6

8-Slot NI PXIe-1082 Backplane Installation Guide 6 ni.com

PXI Local Bus

The PXI backplane local bus is a daisy-chained bus that connects each

peripheral slot with adjacent peripheral slots to the left and right.

The backplane routes PXI Local Bus 6 between adjacent PXI slots. The left

local bus 6 from slot 1 is not routed anywhere, and the right local bus signal

from slot 18 is not routed anywhere.

Local bus signals may range from high-speed TTL signals to analog signals

as high as 42 V.

Initialization software uses the configuration information specific to each

adjacent peripheral module to evaluate local bus compatibility.

PXI Trigger Bus

All slots on the same PXI bus segment share eight PXI trigger lines. You

can use these trigger lines in a variety of ways. For example, you can use

triggers to synchronize the operation of several different PXI peripheral

modules. In other applications, one module in the system timing slot can

control carefully timed sequences of operations performed on other

modules in the system. Modules can pass triggers to one another, allowing

precisely timed responses to asynchronous external events the system is

monitoring or controlling. Figure 4 shows the PXI trigger bus connectivity.

Figure 4. PXI Trigger Bus Connectivity Diagram

HHHH

12 3 4 5 6 7 8

PXI Trigger Bus

©National Instruments 7 8-Slot NI PXIe-1082 Backplane Installation Guide

System Reference Clock

The NI PXIe-1082 chassis supplies PXI_CLK10, PXIe_CLK100, and

PXIe_SYNC100 to every peripheral slot with an independent driver for

each signal.

An independent buffer (having a source impedance matched to the

backplane and a skew of less than 500 ps between slots) drives PXI_CLK10

to each peripheral slot. You can use this common reference clock signal to

synchronize multiple modules in a measurement or control system.

An independent buffer drives PXIe_CLK100 to each peripheral slot. These

clocks are matched in skew to less than 100 ps. The differential pair must

be terminated on the peripheral with LVPECL termination for the buffer to

drive PXIe_CLK100 so that when there is no peripheral or a peripheral that

does not connect to PXIe_CLK100, no clock is being driven on the pair to

that slot. Refer to Figure 5 for a termination example.

Figure 5. CLK100 Termination

An independent buffer drives PXIe_SYNC100 to each peripheral slot. The

differential pair must be terminated on the peripheral with LVPECL

termination for the buffer to drive PXIe_SYNC100 so that when there is

no peripheral or a peripheral that does not connect to PXIe_SYNC100, no

SYNC100 signal is being driven on the pair to that slot. Refer to Figure 5

for a termination example.

In summary, PXI_CLK10 is driven to every slot. PXIE_CLK100 and

PXIE_SYNC100 are driven to every peripheral slot.

CLK100 +

CLK100 –

50 Ω50 Ω

47 Ω0.01 μF

–

8-Slot NI PXIe-1082 Backplane Installation Guide 8 ni.com

PXI_CLK10, PXIe_CLK100, and PXIe_SYNC100 have the default timing

relationship described in Figure 6.

Figure 6. System Reference Clock Default Behavior

To synchronize the system to an external clock, you can drive PXI_CLK10

from an external source through the PXI_CLK10_IN pin on the System

Timing Slot. Refer to Table 10, XP4 Connector Pinout for the System

Timing Slot, for the pinout. When a 10 MHz clock is detected on this pin,

the backplane automatically phase-locks the PXI_CLK10, PXIe_CLK100,

and PXIe_SYNC100 signals to this external clock and distributes these

signals to the slots. Refer to the Backplane Specifications section for the

specification information for an external clock provided on the

PXI_CLK10_IN pin of the system timing slot.

You also can drive a 10 MHz clock on connector J36. Refer to Figure 11 for

the location of this connector. When a 10 MHz clock is detected on this

connector, the backplane automatically phase-locks the PXI_CLK10,

PXIe_CLK100, and PXIe_SYNC100 signals to this external clock and

distributes these signals to the slots. Refer to the Backplane Specifications

section for the specification information for an external clock provided

on J36.

If the 10 MHz clock is present on both the PXI_CLK10_IN pin of the

System Timing Slot and connector J36, the signal on the System Timing

Slot is selected. Refer to Table 1, which explains how the backplane selects

the 10 MHz clocks.

PXIe_CLK100

PXI_CLK10

PXIe_SYNC100

012345678901234567890123456789

©National Instruments 9 8-Slot NI PXIe-1082 Backplane Installation Guide

A copy of the backplane’s PXI_CLK10 is exported to connector J36. Refer

to Figure 11 for the location of this connector. An independent buffer drives

this clock. Refer to the Backplane Specifications section for the

specification information for the 10 MHz REF OUT signal on J36.

PXIe_SYNC_CTRL

PXIe_SYNC100 is by default a 10 ns pulse synchronous to PXI_CLK10.

The frequency of PXIe_SYNC100 is 10/nMHz, where nis a positive

integer. The default for nis 1, giving PXIe_SYNC100 a 100 ns period.

However, the backplane allows nto be programmed to other integers. For

example, setting n= 3 creates a PXIe_SYNC100 with a 300 ns period while

still maintaining its phase relationship to PXI_CLK10. The nvalue can be

any positive integer from 1 to 255.

The system timing slot has a control pin for PXIe_SYNC100 called

PXIe_SYNC_CTRL, for use when n > 1. Refer to Table 9, XP3 Connector

Pinout for the System Timing Slot, for the system timing slot pinout. Refer

to the Backplane Specifications section for the PXIe_SYNC_CTRL input

specifications.

By default, a high level detected by the backplane on the

PXIe_SYNC_CTRL pin causes a synchronous restart for the

PXIe_SYNC100 signal. On the next PXI_CLK10 edge, the

PXIe_SYNC100 signal restarts. This allows several chassis to have

their PXIe_SYNC100 in phase with each other. Refer to Figure 7 for

timing details with this method.

Table 1. Backplane External Clock Input Truth Table

System Timing Slot

PXI_CLK10_IN J36 10 MHz REF IN

Backplane PXI_CLK10,

PXIe_CLK100 and PXIe_SYNC100

No clock present No clock present Backplane generates its own clocks

No clock present 10 MHz clock present PXI_CLK10, PXIe_CLK100 and

PXIe_SYNC100 all phase-locked to

J36—10 MHz REF IN

10 MHz clock present No clock present PXI_CLK10, PXIe_CLK100 and

PXIe_SYNC100 all phase-locked to

System Timing Slot—PXI_CLK10_IN

10 MHz clock present 10 MHz clock present PXI_CLK10, PXIe_CLK100 and

PXIe_SYNC100 all phase-locked to

System Timing Slot—PXI_CLK10_IN

8-Slot NI PXIe-1082 Backplane Installation Guide 10 ni.com

Figure 7. PXIe_SYNC100 at 3.33 MHz Using PXIe_SYNC_CTRL as Restart

Mechanical Requirements

Mounting

Figure 8 shows the backplane dimensions. There are 22 holes available for

mounting with M2.5 hardware.

Use all mounting holes for proper backplane support.

Eight mounting holes on top of the backplane have plated annular pads on

the back of the backplane. Use these mounting holes to connect the

backplane ground to the chassis in which the backplane is mounted. If you

do not want to connect the backplane ground to the chassis, use insulated

washers at these mounting holes. Refer to Figure 11 for the mounting hole

positions.

PXI_CLK10

PXIe_SYNC_CTRL

PXIe_SYNC100

SYNC100 Divider

Restarted Here

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