Female miniDisplayPort to female DisplayPort routing? - Page 1
Forum section: electronics / beginners

author: idoit
author_rank: Contributor
timestamp: March 20, 2022, 11:56:20 pm
content: Hello everyone,According to my searches, DisplayPort and miniDP are compatible with each other and they both have 20 pins. I want to route a female miniDP pins to those of a female DisplayPort. I was wondering if someone can do a pin-out to pin-out for me... which pin from miniDP to connect to which pin in DisplayPort. I have attached a few photos as well as a document that shows the pinout for both ports, but need some help figuring it out to do it the right way.Source and Sink throw me off as I don't know what they refer to (male or female port?)I don't want to blow anything upThank you!Document:https://glenwing.github.io/docs/mDP-1.0.pdfpage 19 of 35 is the one I am looking for, correct?I have created a little spreadsheet that you can enter your input and help me:https://docs.google.com/spreadsheets/d/1bwYSc-nqhhEzm0b4TG8-vsim0_heoYq-841zy4Ujnko/edit?usp=sharingThank you!

author: idoit
author_rank: Contributor
timestamp: March 21, 2022, 03:54:25 am
content: Do I need:A. Female miniDP (Source) to Female DP (Sink)OrB. Female miniDP (Sink) to Female DP (Sink) ?The first one seems to be the one on page 19, but if what I need is option B above, then I need to combine tables from page 18 and page 19 to derive to female miniDP (Sink) to Female DP (Sink), correct?!

author: tooki
author_rank: Super Contributor
timestamp: March 21, 2022, 10:13:08 am
content: Source and sink don’t refer to connector gender, but whether the connector is serving as an output (source) or input (sink). Both of the connectors on the devices will typically be female, since you’ll use a male-male cable to connect them.I would just buy a different cable and leave the connectors as-is, since DisplayPort connectors are very fiddly.What exactly are you trying to do, anyway? Make a cable? Change the socket in a device? Make an adapter? …?

author: idoit
author_rank: Contributor
timestamp: March 21, 2022, 03:12:56 pm
content: Thanks for the reply. Here's what I would like to do:I have a ThinkPad laptop with DP1.1aport. I would like tohardware modthe case and add a miniDP port as well, which would simply connect to the corresponding pads of DisplayPort on the motherboard -- with 20 thin copper wires. So essentially, only one of them can be used at a time, but that'd be okay.So with this in mind, what I would need is a DPsink<-> miniDPsinkpinout, correct?I have created a spreadsheet (https://docs.google.com/spreadsheets/d/1bwYSc-nqhhEzm0b4TG8-vsim0_heoYq-841zy4Ujnko/edit?usp=sharing) Would you be able to help me fill it out with proper pin-out. (It's on the right side of the sheet). Thank you!DP 1.1a standard:https://glenwing.github.io/docs/DP-1.1a.pdf

author: idoit
author_rank: Contributor
timestamp: March 21, 2022, 03:48:02 pm
content: I have attached miniDP sink pinout and DP sink pinout. Would it be just connecting these corresponding pins together?For example in case ofML_Lane 1 (p)pin# 17 from miniDP sink goes to pin# 9 DP sink, and so on, correct?

author: tooki
author_rank: Super Contributor
timestamp: March 21, 2022, 05:33:14 pm
content: Quote from: idoit on March 21, 2022, 03:12:56 pmI see. Unfortunately, this falls squarely into the realm of “forget it, it’ll never work”. DisplayPort is an extremely high-speed, impedance-controlled signal with strict layout requirements (see PDF link below). You have to length-match the signal pairs to under0.13mm, which will be categorically impossible to achieve with a bodged in jack, while maintaining controlled distances between the wires, never mind the mess caused by having the signals branch.Edit:the PDF even goes on to prohibit stubs to test pads, which is just a few mm of stub, because of the issues caused. So 2cm stubs would likely obliterate the signal.https://www.nxp.com/docs/en/application-note/AN10798.pdfQuote from: idoit on March 21, 2022, 03:12:56 pmNo!!Again, “sink” means INPUT. So the sending device (here, your computer) is the SOURCE, and the receiving device (a display) is the SINK.So you’d be matching the DPsourcepinout to the mDPsourcepinout. No sinks.But again, don’t even try, it’s essentially guaranteed to not work, and you risk ruining the laptop. Just buy an appropriate cable or adapter, like a sane person.