manualshive.com logo in svg

Texas Instruments DS250DF810, User Manual

Share
Download
Texas Instruments DS250DF810 User Manual Download Page 22

Test Case Examples

www.ti.com

22

SNLU180C – August 2015 – Revised September 2019

Submit Documentation Feedback

Copyright © 2015–2019, Texas Instruments Incorporated

DS250DF810EVM User’s Guide

4

Test Case Examples

The following is an example test case with results collected using this EVM.

•

Data Rate

: 25.78125Gbps

•

Data pattern

: PRBS31

•

Backplane insertion loss

: -35dB @ 12.9GHz

•

Crosstalk at victim RX

: 4.1 mV RMS (24.1 mVppd)

•

Victim TX amplitude

: 1200mVppd

•

Victim TX FIR

: C(-1)=-4, C(0)=24, C(+1)=-3

•

Adapt mode

: 2

•

Adapted RX CTLE

: [3,0,0,0]

•

Adapted DFE

: [-0x14, +0x2, +0x1, -0x2, 0x0]

Figure 20. SDD21 Loss Characteristic of Example Test Case

Results:

•

Error count = 0, BER < 1E-13

•

Horizontal eye opening (HEO): 0.44UI @ 1.5E-5

•

Vertical eye opening (VEO): 190mV @ 1.5E-5

•

Eye plot:

-1.000

-0.750

-0.500

-0.250

0

+0.250

+0.500

+0.750

+1.000

+-------+-------+-------+-------+-------+-------+-------+-------+

+300.0

************************************++++++++++++****************

+290.6

*******************************+++++++++++++++++++**************

+281.3

*****************************++++++++++++++++++++++*************

+271.9

***************************+++++++++++++++++++++++++************

+262.5

+*************************+++++++++++++++++++++++++++*********+*

+253.1

++*++********************+++++++++++++++++++++++++++++*****+++++

+243.8

++++++*++****************+++++++++++++++++++++++++++++++++++++++

+234.4

+++++++++++**************+++++++++++++++++++++++++++++++++++++++

+225.0

++++++++++++************+++++.++++++++++++++++++++++++++++++++++

+215.6

+++++++++++++***********++++...+++++++++++++++++++++++++++++++++

+206.3

++++++++++++++**********+++......+++++++++++++++++++++++++++++++

+196.9

+++++++++++++++********++++.......++++++++++++++++++++++++++++++

+187.5

+++++++++++++++********++++........+++++++++++++++++++++++++++++

+178.1

+++++++++++++++********++++.........++++++++++++++++++++++++++++

+168.8

++++++++++++++++******++++..........++++++++++++++++++++++++++++

+159.4

++++++++++++++++******++++...........+++++++++++++++++++++++++++

Summary of Contents for DS250DF810

Page 1: ...ngle power supply and minimal need for external components These features reduce PCB routing complexity and BOM cost The advanced equalization features of the DS250DF810 include a low jitter 3 tap transmit finite impulse response FIR filter an adaptive continuous time linear equalizer CTLE and an adaptive decision feedback equalizer DFE This enables reach extension for lossy interconnect and backp...

Page 2: ...to the Selection Panel 6 5 Low Level Page Capture Illustrating the Different Block Select Options 7 6 Low Level Page Capture After Selecting Access to an Individual Register 7 7 Eye Monitor Page for DS250DF810 Profile 8 8 EEPROM Page for DS250DF810 Profile 9 9 High Level Page with Block Diagram Tab Selected 10 10 High Level Page with Device Status Tab Selected 11 11 Rx EQ DFE Tab 12 12 Cross Point...

Page 3: ... PC using the provided USB cable 3 Connect 3 3V power 2A max as shown below The EVM has an on board 3 3V to 2 5V regulator to supply the Retimer with the required 2 5V Figure 1 DS250DF810EVM Showing Necessary Connections for Power Signal and USB Communications 4 Connect the EVM to the system under test The default EVM configuration has four differential RX inputs and four differential TX outputs a...

Page 4: ... software are as follows 1 Go to www ti com tool sigconarchitect and download the latest version of SigCon Architect At the time this document was written the latest version of SigCon Architect is 2 0 0 4 Figure 2 Download SigCon Architect from www ti com 2 Extract the executable file EXE from the downloaded file and run the executable 3 Follow the installation wizard s instructions to install Sig...

Page 5: ...1 Go to Device tab and choose Manage Devices 2 Click on icon and then select the DS250DF810 device model 3 Fill in the New Device Name DS250DF810 is recommended 4 Select the slave address as configured on EVM typical setting is 0x30 5 Click OK 4 Navigate to the Configuration page of DS250DF810 via the Selection panel Choose Slave Address 0x30 from the drop down menu Verify the USB2ANY Details spec...

Page 6: ...shown below The user may click Read All to load the data in each register from the device to the Register Map The user may access the Shared Global or Channel registers via Block Select To Read a register Type the readable address in the Current Address text box or select a register from the Register Map Click Read Register The data in this register will appear in the Data text box To Write a regi...

Page 7: ... 2019 Submit Documentation Feedback Copyright 2015 2019 Texas Instruments Incorporated DS250DF810EVM User s Guide Figure 5 Low Level Page Capture Illustrating the Different Block Select Options Figure 6 Low Level Page Capture After Selecting Access to an Individual Register ...

Page 8: ...or a given channel if CDR Locked is indicated The EOM_SEL_VRANGE pull down allows the user to adjust the vertical scale for eye plots The user may perform a Single Capture of eye monitor plot or select Continuous Capture to accumulate multiple plots over a period of time The Horizontal Eye Opening HEO and Vertical Eye Opening VEO may be read on the Eye Monitor page If the user desires to do their ...

Page 9: ...ettings are described in greater detail below Common Channel If this box is checked all channels receive the same configuration Different devices can receive different configurations but within one device all channels will receive the same configuration If this box is unchecked then the EEPROM will store the configuration as unique channel configurations Each of the four channels can receive a uni...

Page 10: ... Base Header of devices 8 Bytes device Address Header of slots 66 Bytes slot Data EEPROM Size 256 Bytes EEPROM Size 3 Bytes Base Header of devices 12 Bytes device Address Header of slots 66 Bytes slot Data 2 2 4 High Level Page 2 2 4 1 Overview The High Level Page on the Selection Panel enables the user to easily configure and or check the status of the DS250DF810 high speed data path functional b...

Page 11: ...CDR lock status is displayed Note that each channel s CDR status and configuration is independent from the others EQ Boost This field displays the Rx Continuous Time Linear Equalizer CTLE boost value as a four digit figure Each digit corresponds to one of the four CTLE stages and each can have a value from 0 to 3 DFE Taps The boost values in mV for each of the five Decision Feedback Equalizer DFE ...

Page 12: ...adapt modes To do so the user should click on the desired adapt mode then click Apply to Channel to configure a specific retimer channel Alternatively the user may broadcast the new adapt mode setting by clicking on Apply to all channels CTLE Settings Select the desired channel on Channel Select pull down The GUI will display the current CTLE boost value on the EQ Boost field of the CTLE Settings ...

Page 13: ...configure the 2x2 cross point implemented for each of the adjacent channel pairs of the DS250DF810 retimer With the Pair Select pull down the user can choose which cross point pair to configure 0 1 2 3 4 5 or 6 7 The cross point mode is selected using the Crosspoint Configuration pull down The cross point channels mappings are illustrated on the Crosspoint Settings table on the page and the displa...

Page 14: ...80C August 2015 Revised September 2019 Submit Documentation Feedback Copyright 2015 2019 Texas Instruments Incorporated DS250DF810EVM User s Guide Figure 12 Cross Point Tab Default Mode Selected Figure 13 Cross Point Tab Fanout Mode Selected ...

Page 15: ...lay the mode that the retimer is currently set to along with the data rate setting and also the divider setting in the case of Manual Mode Standard Mode allows the user to program the retimer rate sub rate to one of within a set of pre defined standard values Select the desired channel on Channel Select pull down The user first clicks on the Standard Mode option on the page The user then selects t...

Page 16: ...ll then see the manual mode input fields become adjustable Select the desired divider setting from the Divider Configuration pull down Select divide by 1 when data rate 13 Gbps Select divide by 2 when 13 Gbps data rate 6 5 Gbps Select divide by 4 for data rate 6 5 Gbps Enter desired Data Rate for group 0 then click Write Rate Regs The GUI defaults to max PPM tolerance Enter desired Data Rate for f...

Page 17: ...oftware Description 17 SNLU180C August 2015 Revised September 2019 Submit Documentation Feedback Copyright 2015 2019 Texas Instruments Incorporated DS250DF810EVM User s Guide Figure 16 CDR Tab Manual Mode Selected ...

Page 18: ...cursor and post cursor equalization ratios Figure 17 TX FIR Tab Upon landing on the TX FIR tab the page will display the current decimal values and polarity for the main cursor post cursor and pre cursor FIR taps In addition the page also displays approximate values for the voltage output differential VOD and the de emphasis for both pre cursor and post cursor The user may adjust the FIR tap value...

Page 19: ...n the High Level page allows the user to configure the PRBS generator or Checker functions on any of the channels of the DS250DF810 retimer To enable PRBS Generator on a channel Select the desired channel using the Channel Select pull down Select the desired pattern using the Pattern Type pull down Set desired Polarity via pull down Non Invert or Invert Click Enable button Figure 18 PRBS Tab PRBS ...

Page 20: ...re Period Set pull down to Infinite if it desired to run extended duration test without time limit If Finite period is desired set the pull down to Finite and enter the desired test duration via the Hours and or the Mins Minutes input fields Click Turn ON The user may clear the counter fields by clicking Clear Checker or reset the PRBS checker settings by clicking Reset Checker To turn off the che...

Page 21: ...ton 2 Check the Signal Detect CDR lock and Adapt Complete status indicators to see if the link is established 3 If the CDR is in lock the corresponding lock LED on the EVM will light up 3 Check the Horizontal Eye Opening HEO and Vertical Eye Opening VEO by clicking on the Acquire HEO VEO On button 4 Check the Retimer Receiver s bit error rate by launching the PRBS pattern checker from the Receiver...

Page 22: ...ane insertion loss 35dB 12 9GHz Crosstalk at victim RX 4 1 mV RMS 24 1 mVppd Victim TX amplitude 1200mVppd Victim TX FIR C 1 4 C 0 24 C 1 3 Adapt mode 2 Adapted RX CTLE 3 0 0 0 Adapted DFE 0x14 0x2 0x1 0x2 0x0 Figure 20 SDD21 Loss Characteristic of Example Test Case Results Error count 0 BER 1E 13 Horizontal eye opening HEO 0 44UI 1 5E 5 Vertical eye opening VEO 190mV 1 5E 5 Eye plot 1 000 0 750 0...

Page 23: ... 112 5 121 9 131 3 140 6 150 0 159 4 168 8 178 1 187 5 196 9 206 3 215 6 225 0 234 4 243 8 253 1 262 5 271 9 281 3 290 6 1 000 0 750 0 500 0 250 0 0 250 0 500 0 750 1 000 5 Supplemental Documents All the EVM design layout and other files which are relevant to this EVM are listed below FILE DESCRIPTION FILE NAME Schematic PDF DS280DF810_MW_Rev3 01 23 2015 pdf Board layout file DS280XX810_EVM_BRD_RE...

Page 24: ...There are three part numbers that TI suggests using with this EVM 1 85014420 MF53 1x8A_21MXP 21SMA 152 MXP 15 cable assembly This is a lower cost cable assembly compared to the MXP 40 but the SI performance is very good and more than adequate for 25Gbps operation 2 84099607 MF53 1x8A_21MXP 11SK 305 MXP 40 cable assembly This cable assembly is designed specifically for 40 GHz It features a male cab...

Page 25: ...t Documentation Feedback Copyright 2015 2019 Texas Instruments Incorporated Revision History Revision History NOTE Page numbers for previous revisions may differ from page numbers in the current version Changes from Original October 2015 to C Revision Page Initial Public Release 3 ...

Page 26: ...other than TI b the nonconformity resulted from User s design specifications or instructions for such EVMs or improper system design or c User has not paid on time Testing and other quality control techniques are used to the extent TI deems necessary TI does not test all parameters of each EVM User s claims against TI under this Section 2 are void if User fails to notify TI of any apparent defects...

Page 27: ... These limits are designed to provide reasonable protection against harmful interference in a residential installation This equipment generates uses and can radiate radio frequency energy and if not installed and used in accordance with the instructions may cause harmful interference to radio communications However there is no guarantee that interference will not occur in a particular installation...

Page 28: ...y for convenience and should be verified by User 1 Use EVMs in a shielded room or any other test facility as defined in the notification 173 issued by Ministry of Internal Affairs and Communications on March 28 2006 based on Sub section 1 1 of Article 6 of the Ministry s Rule for Enforcement of Radio Law of Japan 2 Use EVMs only after User obtains the license of Test Radio Station as provided in R...

Page 29: ... any interfaces electronic and or mechanical between the EVM and any human body are designed with suitable isolation and means to safely limit accessible leakage currents to minimize the risk of electrical shock hazard User assumes all responsibility and liability for any improper or unsafe handling or use of the EVM by User or its employees affiliates contractors or designees 4 4 User assumes all...

Page 30: ...OR DAMAGES ARE CLAIMED THE EXISTENCE OF MORE THAN ONE CLAIM SHALL NOT ENLARGE OR EXTEND THIS LIMIT 9 Return Policy Except as otherwise provided TI does not offer any refunds returns or exchanges Furthermore no return of EVM s will be accepted if the package has been opened and no return of the EVM s will be accepted if they are damaged or otherwise not in a resalable condition If User feels it has...

Page 31: ...se resources are subject to change without notice TI grants you permission to use these resources only for development of an application that uses the TI products described in the resource Other reproduction and display of these resources is prohibited No license is granted to any other TI intellectual property right or to any third party intellectual property right TI disclaims responsibility for...

Reviews:

No comments

Brands by name

Popular brands

Load more brands