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Test Case Examples

www.ti.com

22

SNLU214A – July 2016 – Revised September 2019

Submit Documentation Feedback

Copyright © 2016–2019, Texas Instruments Incorporated

DS280DF810EVM User’s Guide

4

Test Case Examples

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

•

Data Rate

: 25.78125 Gbps

•

Data pattern

: PRBS31

•

Backplane insertion loss

: -35 dB at 12.9 GHz

•

Crosstalk at victim RX

: 4.1 mV RMS (24.1 mVppd)

•

Victim TX amplitude

: 1200 mVppd

•

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 at 1.5E-5

•

Vertical eye opening (VEO): 190 mV at 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

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

Содержание DS280DF810EVM

Страница 1: ...le power supply and minimal need for external components These features reduce PCB routing complexity and BOM cost The advanced equalization features of the DS280DF810 include a low jitter 3 tap trans...

Страница 2: ...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 DS2...

Страница 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 DS280DF810EVM Showing Necessary Connections for Power Signal and US...

Страница 4: ...ww 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 Arch...

Страница 5: ...Go to Device tab and choose Manage Devices 2 Click on icon and then select the DS280DF810 device model 3 Fill in the New Device Name DS280DF810 is recommended 4 Select the slave address as configured...

Страница 6: ...own 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 regist...

Страница 7: ...019 Submit Documentation Feedback Copyright 2016 2019 Texas Instruments Incorporated DS280DF810EVM User s Guide Figure 5 Low Level Page Capture Illustrating the Different Block Select Options Figure 6...

Страница 8: ...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...

Страница 9: ...tings 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 devi...

Страница 10: ...es 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 sl...

Страница 11: ...R 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...

Страница 12: ...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 c...

Страница 13: ...nfigure the 2x2 cross point implemented for each of the adjacent channel pairs of the DS280DF810 retimer With the Pair Select pull down the user can choose which cross point pair to configure 0 1 2 3...

Страница 14: ...14A July 2016 Revised September 2019 Submit Documentation Feedback Copyright 2016 2019 Texas Instruments Incorporated DS280DF810EVM User s Guide Figure 12 Cross Point Tab Default Mode Selected Figure...

Страница 15: ...y 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 r...

Страница 16: ...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 1...

Страница 17: ...oftware Description 17 SNLU214A July 2016 Revised September 2019 Submit Documentation Feedback Copyright 2016 2019 Texas Instruments Incorporated DS280DF810EVM User s Guide Figure 16 CDR Tab Manual Mo...

Страница 18: ...rsor 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 curso...

Страница 19: ...the High Level page allows the user to configure the PRBS generator or Checker functions on any of the channels of the DS280DF810 retimer To enable PRBS Generator on a channel Select the desired chann...

Страница 20: ...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 Hou...

Страница 21: ...DR lock and status indicators to see if the link is established 3 If the CDR is in lock the CDR lock indicator on the page will turn green and display CDR locked 3 Check the Horizontal Eye Opening HEO...

Страница 22: ...rtion loss 35 dB at 12 9 GHz Crosstalk at victim RX 4 1 mV RMS 24 1 mVppd Victim TX amplitude 1200 mVppd 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...

Страница 23: ...0 84 4 93 8 103 1 112 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 Supplement...

Страница 24: ...ere 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 perform...

Страница 25: ...t Documentation Feedback Copyright 2016 2019 Texas Instruments Incorporated Revision History Revision History NOTE Page numbers for previous revisions may differ from page numbers in the current versi...

Страница 26: ...ther 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 tec...

Страница 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 in...

Страница 28: ...instructions set forth by Radio Law of Japan which includes but is not limited to the instructions below with respect to EVMs which for the avoidance of doubt are stated strictly for convenience and s...

Страница 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 electr...

Страница 30: ...R 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 Furthe...

Страница 31: ...e 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 reprod...

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