CN101667151A - Signal integrity testing method based on server PCI-Express - Google Patents
Signal integrity testing method based on server PCI-Express Download PDFInfo
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- CN101667151A CN101667151A CN200910018503A CN200910018503A CN101667151A CN 101667151 A CN101667151 A CN 101667151A CN 200910018503 A CN200910018503 A CN 200910018503A CN 200910018503 A CN200910018503 A CN 200910018503A CN 101667151 A CN101667151 A CN 101667151A
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Abstract
The invention provides a signal integrity testing method based on a server PCI-Express, which comprises the following steps: firstly, a PCI-EXPRESS testing tool with a USB interface is connected witha server motherboard for carrying out a PCI-EXPRESS test on the server motherboard, wherein a Tektronix TDS72004 (20 GHZ bandwidth) oscillograph is used as the testing instrument, a Tektronix TCA-SMAconnector and a SMA standard cable (17.5 GHZ bandwidth) are used as the probe, and the specific testing parameters are shown in Figures 1 and 2: logic high-low levels, rise/fall times, monotonicities,overshoots/ undershoots and jitters of the TX signal and the Rx signal; through the test, whether the signals of the server motherboard fully conform to the PCI-EXORESS2.0 Standard can be determined;and secondly, the PCB impedance is tested by a TDR (impedance analyzer). The method mainly aims to determine whether the impedance of the cable meets the requirement of 100 ohm (+/-10%); and only when the impedance of the cable meets the standard, the cable can be analogized with the transmission line, so that the phenomena of the reflection and the like of the signals can not happen.
Description
Technical field
The present invention relates to computer communication field, be specifically related to based on problem based on the method for server PCI-Express measuring signal integrality.
Background technology
Current server system has been broken through traditional system concept, develops towards integrated, intelligent, standardized direction.For total system, server is respectively different company's exploitations with Terminal Design, in this case, compatible problem can't be avoided, do not match and problem such as signal cross-talk such as impedance, make the instability of whole PCI-Express transmission link, thereby cause the phenomenon of client's loss of vital data to take place.
PCI-Express is a main flow interface in the present server product, owing to its point-to-point link, stable reliability, abundant and ripe advantages such as instruction set, has progressively substituted pci interface.In the server system of enterprise-level, the PCI-Express interface has promoted the extendability of product, its signal transmission rate can reach 5Gb/s, must relate to the problems of Signal Integrity of PCI-Express signal, in the face of these problems, for the server PCI-Express transmission link, we can come the transmission quality of seizing signal according to the PCI-EXPRESS2.0 industrial specification of standard, make the code requirement that each parameter of signal can both accord with PCI-EXPRESS2.0, allow server and terminal device all under unified standard, move, thereby the PCI-Express signal quality of total system is well transmitted, and then the impedance of avoiding because signal quality is bad producing does not match and problem such as signal cross-talk.
Summary of the invention
The present invention utilizes the PCI-EXPRESS2.0 industrial specification of PCI-SIG to be the theory support point, is the problem that concrete check form solves PCI-EXPRES transmission link signal integrity with signal testing, and concrete summary of the invention can be divided into following three aspects:
1. according to PCI-EXPRESS2.0 specification of signals and the definition of PCI-SIG, the PCI-EXPRESS2.0 data line by the opposite differential signal of two direction of transfers to (LVDS, totally 4) form, send (Tx) and receive (Rx) and respectively walk one the tunnel, PCI-EXPRESS by flow-control information that a circuit-switched data is required and the data mixing that oppositely transmits together, thereby on same data line, realize full duplex.The PCI-EXPRESS output signal characteristics of clear and definite our server host board.
According to the impedance requirement of PCI-EXPRESS2.0, we define the impedance requirement of the impedance accord with PCI of PCB transmission line-EXPRESS transmission, mainly are will 2. the asking of the certain compliant of characteristic impedance of constraint Tx and Rx, with this signal quality that guarantees.
Excellent effect of the present invention is, through detailed signal testing, we can very clearly know the signals layer working condition of total system, meet some such as impedance do not match, problem such as signal interference, very clearly the orientation problem key is pointed out in those places, that link then according to phenomenon and signal testing analysis result, finds final problem place and solution.
On normative foundation, give the PCI-EXPRESS input definition of a standard of terminal device producer, require the terminal device producer industrial specification of signal accord with PCI-EXPRESS2.0 of the PCI-EXPRESS of design oneself equally, total system can not gone wrong at the physical signalling layer, obtain best performance and maximum compatibility.
Description of drawings
Fig. 1 is a test flow chart;
Fig. 2 is a PCI-Express differential signal DP/DN opering characteristic of electric apparatus testing standard
Fig. 3 is the testing impedance standard of PCI-Express differential signal DP/DN and transmission cable, connector.
Embodiment
With reference to the accompanying drawings, content of the present invention is carried out a more detailed enforcement and does an elaboration:
According to the PCI-Express2.0 industrial specification of PCI-SIG technological associations, the standard of definition product and the industrial specification that total system should be observed, whole test system comprises three parts: server, terminal device comprise various extrapolation integrated circuit boards, the definition content comprises:
1) according to the specification of signals of PCI-Express2.0: the PCI-Express2 signal of definition server end motherboard is output as the standard signal of 2.0 up-to-date versions of accord with PCI-Express;
2) according to the impedance requirement of PCI-Express2.0, the impedance requirement of accord with PCI-Express2.0 is wanted in the impedance of transmission cable on the definition pcb board;
3) in the entire product system, be guiding with the signal quality, according to the PCI-EXPRESS2.0 industrial specification, at first define the specification of signals that server host board comes accord with PCI-EXPRESS2.0, making drive end is a high-grade signal source;
4) this transmission medium of pcb board is done a normalized definition, satisfy system-level impedance matching requirement, make signal undistorted, unreflectedly on this transmission medium, transmit;
5) terminal device has been carried out interface definition, promptly the signal by the cable end input is the standard signal of one accord with PCI-EXPRESS2.0 standard, do not produce shake for total system is shown, its Terminal Design designs the scope and the characteristic of input signal according to the PCI-EXPRESS2.0 standard;
6) PCI-EXPRESS2.0 specification of signals and the definition of PCI-SIG, the PCI-EXPRESS2.0 data line is become by two opposite set of differential signal pairs of direction of transfer, send Tx and receive Rx and respectively walk one the tunnel, PCI-EXPRESS by flow-control information that a circuit-switched data is required and the data mixing that oppositely transmits together, thereby on same data line, realize full duplex, with the PCI-EXPRESS output signal characteristics of clear and definite server host board:
7) according to the impedance requirement of PCI-EXPRESS2.0, the impedance requirement of the impedance accord with PCI of definition PCB transmission line-EXPRESS transmission retrains the requirement of the certain compliant of characteristic impedance of Tx and Rx, with this signal quality that guarantees;
Concrete testing procedure is as follows:
1) at first utilizes the PCI-EXPRESS measurement jig of being with USB interface, server host board is carried out the test of PCI-EXPRESS, the testing tool that USB interface connects uses Tektronix TDS72004,20GHZ bandwidth oscillograph, probe uses the connector of Tektronix TCA-SMA to add the standard cable 17.5GHZ bandwidth of SMA, content measurement comprises the logic high low level of Tx and Rx signal, rise or fall time, monotonicity, overshoot or under dash, shake confirms then that by test server master board all satisfies the PCI-EXPRESS2.0 standard;
2) utilize electric impedance analyzer TDR to carry out the test of PCB impedance, confirm whether the impedance of cable satisfies the requirement of 100ohm ± 10%, and the impedance of cable is in standard, and transmission signals reflex can not take place;
As described in the summary of the invention, at first we utilize the PCI-EXPRESS measurement jig of band USB interface to be connected with server host board, server host board to us carries out the test of PCI-EXPRESS, testing tool uses Tektronix TDS72004 (20GHZ bandwidth) oscillograph, probe uses the connector of Tektronix TCA-SMA to add the standard cable (17.5GHZ bandwidth) of SMA, and the concrete parameter of test is exactly shown in accompanying drawing one and the accompanying drawing two, the logic high low level of Tx and Rx signal, rising/fall time, monotonicity, overshoot/dash down, shake, by test, can confirm that server master board is that signal all satisfies the PCI-EXPRESS2.0 standard.
Utilize TDR (electric impedance analyzer) to carry out the test of PCB impedance then.Mainly be to confirm whether the impedance of cable satisfies the requirement of 100ohm (± 10%).The impedance that makes cable so just can make cable analogy and transmission line in standard, make signal that phenomenons such as reflection can not take place.
We can be our design specifications at last, and signal definition, test data result etc.s are informed terminal device manufacturer, allows them according to our designing requirement, finishes the coupling of total system design, the problems of Signal Integrity of final complete resolution system.
Claims (1)
1, based on the method for server PCI-Express measuring signal integrality, it is characterized in that, PCI-Express2.0 industrial specification according to PCI-SIG technological associations, the standard of definition product and the industrial specification that total system should be observed, whole test system comprises three parts: server, terminal device comprises various extrapolation integrated circuit boards, and the definition content comprises:
1) according to the specification of signals of PCI-Express2.0: the PCI-Express2 signal of definition server end motherboard is output as the standard signal of 2.0 up-to-date versions of accord with PCI-Express;
2) according to the impedance requirement of PCI-Express2.0, the impedance requirement of accord with PCI-Express2.0 is wanted in the impedance of transmission cable on the definition pcb board;
3) in the entire product system, be guiding with the signal quality, according to the PCI-EXPRESS2.0 industrial specification, at first define the specification of signals that server host board comes accord with PCI-EXPRESS2.0, making drive end is a high-grade signal source;
4) this transmission medium of pcb board is done a normalized definition, satisfy system-level impedance matching requirement, make signal undistorted, unreflectedly on this transmission medium, transmit;
5) terminal device has been carried out interface definition, promptly the signal by the cable end input is the standard signal of one accord with PCI-EXPRESS2.0 standard, do not produce shake for total system is shown, its Terminal Design designs the scope and the characteristic of input signal according to the PCI-EXPRESS2.0 standard;
6) PCI-EXPRESS2.0 specification of signals and the definition of PCI-SIG, the PCI-EXPRESS2.0 data line is become by two opposite set of differential signal pairs of direction of transfer, send Tx and receive Rx and respectively walk one the tunnel, PCI-EXPRESS by flow-control information that a circuit-switched data is required and the data mixing that oppositely transmits together, thereby on same data line, realize full duplex, with the PCI-EXPRESS output signal characteristics of clear and definite server host board;
7) according to the impedance requirement of PCI-EXPRESS2.0, the impedance requirement of the impedance accord with PCI of definition PCB transmission line-EXPRESS transmission retrains the requirement of the certain compliant of characteristic impedance of Tx and Rx, with this signal quality that guarantees;
Concrete testing procedure is as follows:
1) at first utilizes the PCI-EXPRESS measurement jig of being with USB interface, server host board is carried out the test of PCI-EXPRESS, the testing tool that USB interface connects uses Tektronix TDS72004,20GHZ bandwidth oscillograph, probe uses the connector of Tektronix TCA-SMA to add the standard cable 17.5GHZ bandwidth of SMA, content measurement comprises the logic high low level of Tx and Rx signal, rise or fall time, monotonicity, overshoot or under dash, shake confirms then that by test server master board all satisfies the PCI-EXPRESS2.0 standard;
2) utilize electric impedance analyzer TDR to carry out the test of PCB impedance, confirm whether the impedance of cable satisfies the requirement of 100ohm ± 10%, and the impedance of cable is in standard, and transmission signals reflex can not take place.
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| CN200910018503A CN101667151A (en) | 2009-09-04 | 2009-09-04 | Signal integrity testing method based on server PCI-Express |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105045697A (en) * | 2015-06-24 | 2015-11-11 | 浪潮电子信息产业股份有限公司 | Test system and method for PCIE signal integrity |
| CN106021151A (en) * | 2016-05-09 | 2016-10-12 | 浪潮电子信息产业股份有限公司 | Signal enhancing board as well as signal enhancing method and system |
| CN107491369A (en) * | 2017-08-18 | 2017-12-19 | 郑州云海信息技术有限公司 | A kind of detection method and system of quick PCIE3.0 signal integrities |
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2009
- 2009-09-04 CN CN200910018503A patent/CN101667151A/en active Pending
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105045697A (en) * | 2015-06-24 | 2015-11-11 | 浪潮电子信息产业股份有限公司 | Test system and method for PCIE signal integrity |
| CN106021151A (en) * | 2016-05-09 | 2016-10-12 | 浪潮电子信息产业股份有限公司 | Signal enhancing board as well as signal enhancing method and system |
| CN107491369A (en) * | 2017-08-18 | 2017-12-19 | 郑州云海信息技术有限公司 | A kind of detection method and system of quick PCIE3.0 signal integrities |
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