Gen3 Multi Lead Probe with SRIS Support User Manual
Contents
1. a TELEDYNE LECROY Everywhereyoulook Gen3 Multi lead Probe with SRIS Support User Manual Before Starting Use this document for quick installation and setup If you experience problems or need more information see the product manuals available at the Teledyne LeCroy web site or in the Documents folder in the PCle Protocol Suite installation DVD 1 Introduction The Gen3 Teledyne LeCroy Multi lead Probe with SRIS allows developers using an embedded PCI Express bus in their PCB designs to tap into the signal traces directly and capture bus traffic for protocol analysis and debugging The probe connects to a Teledyne LeCroy Summit Gen3 Line of Protocol Analyzers via a Multi lead Probe Pod Figure 1 shows the complete assembly of the Gen3 Multi lead Probe and its components A Gen3 Multi lead Probe has a Gen3 Multi lead POD POD in Figure 2 High Bandwidth coax cables C and a Differential Flex Tip Assembly for easy connection for photo see Section 2 Components Figure 2 shows a Y cable Y which connects to a Summit Analyzer The External Clock Cable E is needed when the serial data is clocked with spread spectrum or in cases of separate reference clocking SRIS Support is provided for PCI Express systems including 2 5 GT s 5 0 GT s and 8 0 GT s PCle 3 0 One Multi lead POD is required for link widths of up to x4 x8 link width requires two PODs x16 link width requires four PODs Figure 1 show2. this document Two Daisy Chain Cables Two Pod Mounting Brackets and four screws 3 Determining Sampling Points Installing a multi lead probe system requires some advanced planning Since the multi lead probe system is designed for use with PCB designs that may not have been specifically laid out with probing in mind probe points must be identified and selected to allow the protocol analyzer system to access the PCI Express bus contained within the board Typical probe points might include exposed pins of components AC coupling capacitors or exposed traces or vias on the board along the PCle channel For each bi directional lane of a PCI Express bus the probe tips need to make contact with four signals Rx Rx Tx and Tx to capture data traffic going in each direction So for a x1 design four signals must be sampled for a x2 eight signals and so on up to a x16 design which requires 64 individual sample points The G3 multi lead probe tip is designed to sample two points in close proximity either the Rx and Rx differential pair or the Tx and Tx differential pair So each bi directional lane requires two probe tips up to 32 probe tips for x16 designs Rx Once possible probe locations are identified the locations to be used must be selected considering the following criteria 1 The probe locations must be within sufficient physical proximity to each other that the probe cables and pro
3. alysis uses spread spectrum clocking then the external reference clock from the device under test DUT must be used The external reference clock also allows the analyzer to obtain lock more quickly when a link is returning from a low power state If the DUT does not supply a reference clock the internal reference clock in the analyzer can be used instead and the reference clock cables are not required The selection of using the external reference clock or the internal analyzer clock is made in the Recording Options dialog of the analyzer software see checkbox in the lower right corner If an external reference clock is required connect the reference clock cable from the DUT to the Ref Clk In port on the Probe Pod The reference clock cable is configured at one end to attach to a two pin header on the DUT and the other end has a connector that clips into the Ref Clk In port on the pod In multiple probe pods are used i e for x8 or x16 designs connect the reference clock cable to the first Probe Pod and then connect the daisy chain clock cable from the Ref Clk Out port on the first pod to the Ref Clk In port on the second pod and if using four pods continue to daisy chain to connect all pods Daisy Chain Cables up to 3 Reference Clock Cable 1 T Probe Pod 1 Probe Pod 2 Probe Pod 3 Probe Pod 4 DUT for x8 and x16 for x16 for x16 When using the Gen3 Multi Lead probe with SRIS you must connect an extra clock ca
4. be tips can easily reach back to the probe pod which gathers and amplifies the signals prior to passing them along to the analyzer Each probe pod handles up to eight 8 probe tips The probe pods are then connected back to the analyzer using 1 meter iPass cables using Y cables for x1 x2 and x4 applications using Summit T3 8 or T3 16 or using straight x4 to x8 iPass cables for other cases The dimensions of the probe components are as follows e Probe Pod 163 x 37 x 106 mm 6 4 x1 5 x 4 2 e Probe Cable 294 mm 11 6 e Probe Tip 71 mm 2 8 2 The probe locations should be selected to provide the best possible signal with minimum distortion along the PCI Express channel As a general rule of thumb this location is typically at the pads of the AC coupling capacitor that should be positioned as near as possible to the transmitter see illustration below Probe tips soldered near the caps If an oscilloscope is available to make measurements the probe requires the following minimum differential signal requirements at a given bit error rate at the analyzer probe point Inner eye width 82 ps Minimum see 1 in the following figure e Inner eye height 52 mVpp Minimum see 2 in the following figure e Maximum signal amplitude 1500 mVpp Maximum see 3 in the following figure e If measurements simulations are not available the optimal location is typically at the AC coupling caps near the transmitter Onc
5. ble from the DUT to the US_Clk In on the POD and connect the daisy chain cable from the US_Clk Out on one POD to the US_CLK In on the next chained POD in a similar fashion as done for the Ref CLK case The DIP switch controls the clock routing on the iPass cable to the analyzer Make sure they are properly set up according to the table in section 8 6 Optional Bracket Installation Horizontal The components included with the Gen3 Multi Lead Probe include two mounting brackets and four screws with lock washers for the Probe Pod to keep it securely attached to your work area The Probe Pod can be mounted horizontally or vertically The method is basically the same only the orientation of the bracket differs for vertical mounting rotated 90 degrees WARNING Use only the screws provided as longer screws may go deeper in the probe pod and damage internal components See figures below for PCI Express Multi Lead Probe Pod Horizontal Installation Step 1 Align the screws washers and brackets with the holes on both sides of the PCI Express Multi Lead Probe Pod Differential Flex Tip Attaching the Tip to the Probing Point 1 The Flex Tip is pre installed with 0 1 inch long leads a It is recommended to trim the length of the tip as short as possible to improve signal fidelity margin at the analyzer The two leads must be cut to the length of 0 01 inches 2 Once soldered the tip head must be angled at 30 60 deg
6. e probe points have been selected you are now ready to prepare for installation of the Gen3 Multi lead Probe D lt gt D Va a Note As an aid in calculating the differential impedance with probes installed the probe impedance is 600Q typical gt 400Q at 4 GHz and gt 3000 at 12 GHz 4 Preparing Probe Tips for Installation The first step in preparing for installation is to ensure that the probe tips are in good condition If you are using new probe tips for the first time examine the leads under magnification to ensure the leads are clean and secure and then proceed to step 6 If the probe tips have been used previously it may be necessary to clean the leads of excess solder or to remove and replace the leads Small spool of wire is included with each probe tip to be used in replacing broken or damaged tip leads To replace the tip leads follow this procedure 1 Using a soldering iron heat the existing lead wire at the via where the lead enters the probe tip Carefully remove the existing wire segment from the via Clean the via barrel of any excess solder Cut a new length of wire of approximately 2 3 from the wire spool supplied with the probe tip Thread the wire segment through the clean via located at the tip of the probe Heat with a soldering iron and apply small amounts of solder on the under side of the tip at the via until the wire is secured within the via Trim the excess wire on the top of the probe tip as closely a
7. eam channels 0 7 to one POD according to the Lane Mapping of the Straight Analyzer cable 0 7 e Use the Straight Analyzer cable to connect the POD to Upstream 0 7 ports on the analyzer e Connect the Upstream channels 8 15 to another POD according to Lane Mapping of the Straight Analyzer cable 0 7 Upstream Lane 8 should be connected to lane 0 on the POD and Upstream lane 15 should be connected to lane 7 on the POD e Use the Straight Analyzer cable to connect the POD to Upstream 8 15 ports on the analyzer Do the same for Downstream channels using the other PODs x16 PCI Express designs require four probe pods all of which will be fully populated with 32 cables required to capture bi directional x16 traffic The probe pods are configured as follows Connect to Upstream 8 15 port on analyzer Connect to Downstream 8 15 port on analyzer Clock Configuration Use the tables below to configure switches for clock selection for each direction in the analyzer 1 2 CableA 3 4 CableB ON ON Reserved ON ON Reserved Reference Clock Common Clock Reference Clock Common Clock OFF ON configuration or Downstream Clock OFF ON configuration or Downstream Clock SRIS configuration SRIS configuration ON OFF Upstream Clock SRIS configuration ON OFF Upstream Clock SRIS configuration OFF OFF Reserved OFF OFF Reserved Note Factory defaults 1 Off 2 On 3 Off 4 On Note Cable A refers to the A
8. igns up to x4 to connect the single probe pod to both the Upstream and Downstream ports of the analyzer Normally the A cable is attached to the Upstream or Upstream 0 7 analyzer port and the channels connected to the AO through A3 ports will show up as the Upstream channels of Lanes 0 3 respectively x8 Configuration Designs with lane widths larger that x4 require multiple probe pods and instead of using an iPass Y cable x4 to x8 straight iPass cables are used So for a x8 design two probe pods are required and one carries the Upstream lanes 0 7 while the second carries the Downstream lanes 0 7 Which pod is Upstream and which is Downstream depends on which ports the iPass cables are plugged into on the analyzer There is no difference in the actual pods themselves Both pods are fully populated as shown in the illustration below The x8 configuration uses 2 PODs and 2 Straight Analyzer cables e Connect the Upstream lanes to one POD according to the Lane Mapping of the Straight Analyzer Cable 0 7 e Use the Straight Analyzer cable to connect the POD to the Upstream port on the analyzer Do the same for Downstream channels using the second POD oe FF CA jC Ca CA CE me Fm rs Connect to Upstream port on analyzer Connect to Downstream port on analyzer x16 Configuration The x16 configuration uses 4 PODs and 4 x4 to x8 iPass Straight Analyzer cables PEO13UCA X Connect the Upstr
9. le Descrambing Ci AsersPublc Documents ss Switch Srple Made Daini Saven SaveasDefadt osd Load Defadt Resiare Factory Senos 11i 1 Environmental Conditions Temperature Operating 32 F to 122 F 0 C to 50 C Temperature Non Operating 14 F to 176 F 10 C to 80 C Humidity Operating 10 to 90 RH non condensing Teledyne LeCroy Customer Support Online Download Mail 3385 Scott Blvd Santa Clara CA 95054 3115 Periodically check the Teledyne LeCroy Protocol Solutions Web teledynelecroy com tm Library software PSG Group web site for software updates and other support E mail psgsupport teledynelecroy com related to this product Software updates are available to Tel 800 909 7112 USA and Canada users with a current Maintenance Agreement Tel 408 653 1260 worldwide Fax 408 727 6622 worldwide Trademarks and Servicemarks Changes Teledyne LeCroy PCle Protocol Suite Summit T3 16 and Product specifications are subject to change without notice Summit T3 8 are trademarks of Teledyne LeCroy Inc Teledyne LeCroy reserves the right to revise the information All other trademarks are property of their respective in this document without notice or penalty companies Copyright 2014 by Teledyne LeCroy Inc All rights reserved Part Number 924689 00 Rev B This document may be printed and reproduced without additional permission but all copies should con
10. ngth of the tip as short as possible to improve signal fidelity margin at the analyzer The two leads must be cut to the length of 0 01 inches b Solder the leads to the appropriate sampling points using the minimum amount of solder necessary to maintain a secure connection c Once soldered the probe tip should be angled at 30 45 degrees to the plane of the PCB under test as shown in the figure to the right d Avoid placing the tip over any PCB components 30 60 e Position the flexible metal wire of the support bracket to hold the probe tip in place and at the desired angle to the PCB under test 3 Once the probe tip has been installed properly in the support bracket and soldered to the sampling points on the PCB under test the installed probe tip should look like the illustration below 4 The probe cables should then be plugged into the probe pod s starting with the lowest left port as shown in the illustration at the right See section 7 for information on how to connect the cables under different configurations 5 Each probe tip should then be connected to the high bandwidth coax cable assembly by plugging the probe tip into the smaller end of the probe cable Make sure you connect the soldered Lane 0 to the coaxial pair connected to Lane 0 in the pod and so on 6 With the probe cables plugged into the Probe Pod connect the Probe Pod to the protocol analyzer by using iPass cables see A below For x1 t
11. o x4 designs that use only one Probe Pod use an iPass Y cable to make the connection to the Summit T3 8 or T3 16 analyzer Plug the A side of the cable into the Upstream port on the analyzer Plug the B side of the cable into the Downstream port If using the Summit T3 16 use the Upstream 0 7 and Downstream 0 7 ports This will make the probe cables connected to the AO through A3 ports on the Probe Pod appear as Upstream lanes 0 through 3 on the analyzer and the probe cables connected to the BO through B3 ports will appear as Downstream lanes 0 through 3 For x8 designs that use two Probe Pods connect a x4 to x8 straight iPass cable from one pod to the Upstream port and a second straight iPass cable from the second Probe Pod to the Downstream port The larger x8 end of the cable plugs into the Probe Pod and the smaller x4 end plugs into the analyzer For x16 designs that use four pods you must use a Summit T3 16 analyzer or as an alternative two Summit T3 8 analyzers which are connected by a PEO60ACA X Summit T3 8 x16 Expansion Cable Connect one Probe Pod to each of the four Summit T3 16 connectors Upstream 0 7 Upstream 8 15 Downstream 0 7 and Downstream 8 15 using x4 to x8 straight iPass cables Clock Connectors on the pod 7 Reference Clock Cables Reference clock cables are provided with each Probe Pod see B above to be used when recording PCle traffic with external clock If the PCI Express link under an
12. portion of the analyzer Y cable Cable B refers to the B portion of the analyzer Y cable Note When using Straight Cable in some analyzer configurations refer only to table for Cable A 0 Recording Traffic After the Summit Analyzer and Multi Lead Probe are properly setup use the PCle Protocol Suite software to record traffic in the link Follow the instructions in the user manual that came with your analyzer to install the software on the host CPU which can be connected to the analyzer via a USB or Ethernet connection For instructions on setting up and implementing a recording please refer to the PC Express Multi Lane Protocol Analyzer User Manual available at the Teledyne LeCroy web site or in the Documents folder in the PCle Protocol Suite installation DVD Select Use External Reference Clock to use the external reference clock ene Rear sibs Sets Recording Type cording Made tne Samer 5 Protocol Recording Speed nk wt Diaria trace Recording Esam xs z Manual Trigger ra Event Tigger Ihbit Crane Reverse Lanes Buffer sze Trager Poston invert Pointy x Net used vith snapshot ae ae ao soona Unload Size round Trigger Donnstream Inhibit channel Reverse Lanes Invert Polarity a stassy Beep When Tigger Ocnrs E Disable Auto Channel Swap so wuRB HS Save External Interface Sgr l Preserve TC to VC mapping across the recordings Default TC to VE mapping 7 Use External Reference Cc Trace Filename 8 Path Disab
13. rees to the plane of printed circuit board Refer to the following figure a Avoid placing the tip directly over any components b A tip holder supplied with the probe can be used to secure the tip assembly at the desired angle Note See section 4 for instructions on preparing probe tips for installation 8 Cable Configuration Probe Cable Configuration for x1 to x4 Designs The x1 x4 configuration uses 1 POD and a Y cable when using Summit T3 8 or T3 16 Connect the Probe tips to the POD according to the following table Probe Lane POD Connection Probe Lane POD Connection Upstream lane 0 AO Downstream lane 0 BO Upstream lane 1 Al Downstream lane 1 B1 Upstream lane 2 A2 Downstream lane 2 B2 Upstream lane 3 A3 Downstream lane 3 B3 Connect the A side of the Y cable to Upstream connector on the analyzer Connect the B side of the Y cable to Downstream connector on the analyzer PCI Express designs that use x1 through x4 designs use one Gen3 Probe Pod The probe cables are connected to the probe pod as shown in the table below So for a x1 design the two probe cables would be plugged into AO and BO For a x2 design the four probe cables would be plugged into AO BO A1 and B1 For a x4 design all eight ports on a single probe pod would be fully populated The A and B designations refer to the routing of the signals through the iPass Y cable which is used in PCle des
14. s a x1 connection See Section 8 Cable Configuration for analyzer cable configurations and lane mapping Figure 1 Teledyne LeCroy Gen 3 Multi Lead Probe with SRIS Support 2 Components The Teledyne LeCroy Gen3 Multi lead Probe has the following components Gen3 Multi lead POD POD in Figure 2 POD Figure 2 Teledyne LeCroy Gen3 Multi lead Probe Pod and Components Clock Selection Switch To Analyzer Power Jack DC IN 12V Common Clock Reference Output y j also used as Downstream Clock a Output in SRIS applications when INTA Analyzer daisy chaining pods S a Out Common Clock Reference Input earn when using External Reference Leis Clock for single clock applications TELEDYNE also used as Downstream Clock Input for SRIS applications LECROY PCI Express Multi Lead Pod Upstream Clock Output used in x4 tees at 8 0GT s Maximum SRIS applications when daisy with SRIS Support chaining pods Lane Mapping for Straight Analyzer Cable BO 4 Upstream Clock Input for SRIS o 1 applications Connectors for Coaxial Cables Components continued Flexible Wire Probe Tip Holder Power Supply Ay Temporary Removable Stickers 10 High Bandwidth Coax Cable Assembly C in Figure 1 csi 396 Gen3 Multi lead Probe Differential Flex Tip Permanent Stickers 10 Two Reference Clock Cable Assemblies such as the one shown below Quick Start Guide
15. s possible to the surface of the probe tip Trim the lead wire on the underside of the probe tip to a maximum length of 2 5 mm 0 1 Repeat steps 1 7 with the other lead wire Trim the final lead lengths as short as possible to improve signal fidelity while allowing sufficient room to attach the leads to the signal test point and maintaining equal lengths of the two leads to within 0 25 mm 0 01 if possible to improve signal fidelity use calipers to measure lead length 10 Trim the probe wire to a maximum length of 0 1 0 01 inches APRON COND 5 Installing the Gen3 Multi lead Probe Installing the Gen3 Multi lead Probe requires following these steps 1 At the site of each probe tip install a support bracket which is attached to the surface of the PCB using either a removable adhesive pad or a permanent adhesive pad if the installation will be permanent or if additional support is desired Slip the probe tip into the support bracket The small bump on the probe tip head will click into place in the recess visible in the probe bracket See illustrations below of a completed probe bracket installation _ _ _ ee _ COTO 2 Attach the probe tip leads connecting each probe tip to the two differential sampling points for that signal a Use probe tip leads that are of equal length and are not longer than 2 5 mm 0 1 The Flex Tip is pre installed with 0 1 inch long leads It is recommended to trim the le
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