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DisplayPort lanes on the sink are incorrect #25

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mithro opened this issue Aug 26, 2015 · 5 comments
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DisplayPort lanes on the sink are incorrect #25

mithro opened this issue Aug 26, 2015 · 5 comments
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bug design-pcb-layout design-schematic part-video-displayport-in v2-production-board
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Production Board

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mithro commented Aug 26, 2015

Compare DisplayCable to
screenshot from 2015-08-25 20 18 08
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mithro commented Aug 26, 2015

Potential fix? - http://www.xilinx.com/support/documentation/application_notes/xapp491.pdf

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http://www.xilinx.com/support/documentation/user_guides/ug386.pdf

"If the TXP/TXN differential traces are swapped on a board, tie TXPOLARITY High"
and
"If the polarity of RXP/RXN needs to be inverted, RXPOLARITY must be tied High"

So it should be OK.

This was referenced Aug 26, 2015
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@mithro mithro modified the milestone: Production Board Aug 26, 2015
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mithro commented Aug 31, 2015

FYI - @anoopnumato @numato

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mithro commented Nov 2, 2015

@anoopnumato has fixed this.

image

@mithro mithro closed this as completed Nov 2, 2015
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mithro commented Jan 4, 2016

With a standard DisplayPort cable;

GTPA1_DUAL_X0Y0_0(TX) goes to GTPA1_DUAL_X1Y0_1(RX)
GTPA1_DUAL_X0Y0_1(TX) goes to GTPA1_DUAL_X1Y0_0(RX)
GTPA1_DUAL_X1Y0_0(TX) goes to GTPA1_DUAL_X0Y0_1(RX)
GTPA1_DUAL_X1Y0_1(TX) goes to GTPA1_DUAL_X0Y0_0(RX)

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