QUOTE(Technitian3 @ Sep 15 2011, 09:38 PM)
The phats work fine. The slims are as yet untested but should work, I've been over the layout a dozen times (I was even straight/sober a few of those times). The slim has two extra pads for trimming caps on cpu-rst.
All smds are 0805 with the exception of one 5.1k resistor on the xilinx cable which is 1206.
I will add a BOM and part layout as soon as I can.
The schematic for the xilinx buffered cable is in the folder with the pcbs, the ics' are 74hc125 ($0.16 ea). I was having the same issues as the rest of you (can't see cable>can't see device>sees device-won't program) till I built it and now no issues at all.
Cheers, I've been waiting on another USB cable for ages, wouldn't have had LPT problems if I didn't have to give back the one I had been using to friend moving back home interstate..
Didn't notice any schematics in there previously, but I will have a look after, I plan to etch and build it (or get some1 else here to do it ;-) as we need a reliable LPT, I prefer using LPT whenever I can , or to at least have the option, I've noticed more issues with USB/SPI programmed Nands, they (seem to)develop bad-blocks more rapidly and just generally glitch more frequently, saying it anecdotally it sounds wrong, perhaps it's just my experience, but I know of others who seem to think there is a small difference also (It has been suggested to me that it's similar to the reason ppl suggest burning at slower speeds)
QUOTE(antalpromille @ Sep 16 2011, 05:17 AM)
To those people that doubt the chinese ripoffs i can only say that i got them from 3 different suppliers and with the jtag-cable i posted and external 3.3v i got them programmed and they all works on my slim with 270pf cap (smd 0402 mounted on bottom of board) connected with the diagram i posted yearlier. If you cant program or get it to work, maybe you have done something wrong, and not the chinese guys making them.
And to microsoft, nice to see that my brand new slim (never powerd before nand-dump) already got 3 bad blocks, good work m$!
Yes, thanx again for the reassurance, I had begun to think I was going insane... The coincidence seemed suspicious at the time with the Icode thing and the fact when I went to querey the desginer I found they had gone 'On vacation' for a month or so...
QUOTE(Grim187 @ Sep 16 2011, 10:24 AM)
then i think my lpt port in blown, did you have the software running? or just pluged in?
im gonna do some tests on the lpt port without the wiring.
without anything running tdi, tck and tms are 0.11v
when i run impact tdi jumps to 5.03 but tck and tms stay 0.11.
so either the port is blown or im having io access issues.
Pretty sure my port has a lot to do with it, I think it's done one too many extended jasper nand dumps, prolly killed the gain on part of the IO chip (Damm thinkcentre crap, we got it at auction as a work-horse for 40$ I guess it's done well to get us this far.. everything's going USB now, I just hope altera and xillinx work well 2gether ;-)
Also; I went back and looked at the standard, and realised that there is more to boundary scans than I had taken the time to think about.. I can't do anything till I get back to work after the weekend, but I'm fairly confident I will get it going with the basic cable and cap etc.. on the PCB so that the boundary scans match what's expected. Sometimes when u try dozens of things in dozens of combinations, u sometimes unwittingly break something that was working before it was changed, I think that has a role to play, if the cable recognises, but gives back a boundary scan that differs from what it expects, then one needs to apply the kiss principal and eliminate things one at a time;
, LPT port and boundary scan. When I get the chance I will let everyone know what the solution turned out to be for future referrance.. ppl shouldn't have to outlay significant sums of cash to unscrup..... Anyways.. I was about to rage-rant about a certain (now) well-known PCB manufacturer(non-ebay/chinese, not mentioned by me on here *yet*) who has been discovered to have been puling orders from ppl ordering small numbers of PCB's to meet larger ones for the likes of the re-branders and then blatantly BS'ing them about there being something wrong with the order whilst unwittingly contradicting themselves and... ... Anyway I digress.. More on that later (perhaps, we will see) Just beware guys, some ppl (shock-horror) have tried to really cash-in on this in more than the usual devious ways ... Didn't I say I wasn't going to rant?
oops >_< oh wells