Menu
▾
▴
Re: [Gumstix-users] Verdex, USB host, and OE question
|
From: Gordon K. <go...@gu...> - 2008-04-08 19:31:18
|
They are brought straight out and have lengths as follows: USBH_N1 - from IC1.C20 to CONN2.59 = 47.16mm USBH_P1 - from IC1.B22 to CONN2.11 = 32.90mm Gordon > Do the lines on USBH_1 (60pin connector, pins 11 and 59) have the > required Cp, Rs and Rp or are they brought straight out to the 60 pin > connector? If so, what is the PCB trace length from the BGA balls to > the connector pads? > > Regards, > Bryce > > -----Original Message----- > From: Gordon Kruberg [mailto:go...@gu...] > Sent: Wednesday, April 02, 2008 2:44 PM > To: General mailing list for gumstix users. > Subject: ***BULK*** Re: [Gumstix-users] Verdex, USB host, and OE > question > > I looked back at another post I did to answer the setup of the OTG pins > on the 60pin side and found it might be worth repeating here. > > "There are 2 pairs of balls on the 13x13mm PXA270 part that are used > for USB-- > (a) B22 [USBC_P] and C20 [USBC_N] -- this is our USBH_1 (on the > 60pin connector) but the PXA USBH<2> or USBC > (b) E22 [USBH_P] and D23 [USBH_N] -- this is our USBH_0 (on the > 24pin connector) but the PXA USBH<1> > > The 60 pin connector does have the USB "Device or OTG or Host" pins > The 24 pin connector does have the USB "Host-only" pins > > The port for the 24pin connector is USBH<1> which is the port > outlined in figure 20-1 of the Design Guide on p202 > > > <http://pubs.gumstix.com/documents/PXA%20Documentation/PXA270/PXA270%20D > esign%20Guide%20%5b280001-002%5d.pdf> > > This diagram shows the EN to be used as an output to enable the power > control to power-up the VBUS. > Also, the motherboard passes these signals straight through to the > connector. > > Also check to see if you're looking at the correct USBH<PortNumber> in > software. > > Gordon > > > > >> Hello all, >> >> I've built a custom PCB to access the USB host signals coming from the >> > > >> 24-pin flex connector on the Verdex motherboard. I've tested the >> conductivity from the USB port and the enable line all the way to the >> backside of the 24-pin connector, as defined by >> http://docwiki.gumstix.org/USB_24_Pin, and all 5 lines check out. >> However I can't seem to detect any devices attached to the gumstix via >> > > >> USB (nothing in dmesg at least). I've seen it referenced in another >> post that on some versions of buildroot the USB enable line actually >> has to be pulled low to enable the USB port, where as the wiki says to >> > > >> pull the enable line up to 3.3v. I'm running version 279 of Open >> Embedded. Do I need to be pulling the USB enable line (pin 20) to 3.3v >> > > >> or to ground to enable the USB port? >> >> Thanks, >> Mike Caruso >> >> >> > ------------------------------------------------------------------------ > >> > ------------------------------------------------------------------------ > - > >> Check out the new SourceForge.net Marketplace. >> It's the best place to buy or sell services for >> just about anything Open Source. >> >> > http://ad.doubleclick.net/clk;164216239;13503038;w?http://sf.net/marketp > lace > > ------------------------------------------------------------------------ > >> _______________________________________________ >> gumstix-users mailing list >> gum...@li... >> https://lists.sourceforge.net/lists/listinfo/gumstix-users >> >> > > ------------------------------------------------------------------------ > - > Check out the new SourceForge.net Marketplace. > It's the best place to buy or sell services for > just about anything Open Source. > http://ad.doubleclick.net/clk;164216239;13503038;w?http://sf.net/marketp > lace > _______________________________________________ > gumstix-users mailing list > gum...@li... > https://lists.sourceforge.net/lists/listinfo/gumstix-users > > ------------------------------------------------------------------------- > Check out the new SourceForge.net Marketplace. > It's the best place to buy or sell services for > just about anything Open Source. > http://ad.doubleclick.net/clk;164216239;13503038;w?http://sf.net/marketplace > _______________________________________________ > gumstix-users mailing list > gum...@li... > https://lists.sourceforge.net/lists/listinfo/gumstix-users > |