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Here's another that seems to be nothing *but* IO. http://www.trenz-electronic.de/prod/proden19.htm Here is one that at least meets your 32 IO requirement. http://www.orangetreetech.com/zestsc1.htm And this one... http://www.logic.nl/bcinfo.asp?bc"2 There may be more. I searched on "xc3s400 board" at Google and these are just the ones on the first page. --- In , "rtstofer" <rstofer@p...> wrote: > > Not really. > > I erased my 'rant' about IO before I posted the message. I > absolutely hate the idea that the JTAG signals are present on EVERY > connector plus the dedicated header. |
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New to FPGA development
Started by ●January 23, 2005
Reply by ●January 26, 20052005-01-26
Reply by ●January 26, 20052005-01-26
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That zestsc1 would be perfect for my immediate application! Just the right stuff on board and plenty of IO. Way overpriced... I guess I'll use two edge connectors on the Starter Board, save at least $400 and just shut up. --- In , dsprelated@a... wrote: > > Here's another that seems to be nothing *but* IO. > > http://www.trenz-electronic.de/prod/proden19.htm > > Here is one that at least meets your 32 IO requirement. > > http://www.orangetreetech.com/zestsc1.htm > > And this one... > > http://www.logic.nl/bcinfo.asp?bc"2 > There may be more. I searched on "xc3s400 board" at Google and these > are just the ones on the first page. > --- In , "rtstofer" <rstofer@p...> wrote: > > > > Not really. > > > > I erased my 'rant' about IO before I posted the message. I > > absolutely hate the idea that the JTAG signals are present on EVERY > > connector plus the dedicated header. |
Reply by ●January 27, 20052005-01-27
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On Wed, 2005-01-26 at 22:15, rtstofer wrote: > I am trying to build a 32 bit logic analyzer. Do you think that > there is one single 40 pin connector where I can bring in 32 signals > plus a trigger and external clock. Nope. But I can program it no > matter how I hook it up. If internal ram is enough you can get USB 2.0 and 120 user IO on two connectors from a Trenz Micromodule for 99. Kolja Sulimma |
Reply by ●January 27, 20052005-01-27
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--- In , "rtstofer" <rstofer@p...> wrote: > > I am trying to build a 32 bit logic analyzer. Do you think that > there is one single 40 pin connector where I can bring in 32 signals > plus a trigger and external clock. Nope. But I can program it no > matter how I hook it up. One thing I do on my boards is to use a standard connector and pin out for logic analyzer connections. HP has several pinouts defined that you can work with. One is a 40 pin connector with 16 signal, 2 clock, 2 power (don't know why?) and 20 grounds. This is their cable end. You can use an adapter that they sell to condense this down to a 20 pin connector with just one ground and one power. I use this footprint on my development boards (and will provide it on the AT91SAM7 board I am designing) to allow rapid connection of the logic analyzer. Otherwise you have to use all those little grabber things which I don't really like. If you can't find the info on the HP web site (opps, Agilent) I can come up with the PDF file. |
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Reply by ●January 27, 20052005-01-27
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> HP has several [logic analyzer probe] pinouts defined that > you can work with. One is a 40 pin connector with 16 signal, 2 clock, > 2 power (don't know why?) and 20 grounds. This is their cable end. > You can use an adapter that they sell to condense this down to a 20 > pin connector with just one ground and one power. Watch out! The HP/Agilent 20-pin target connector is at target (device) logic levels, but the 40-pin probe cable connector is not. The HP/Agilent 01650-63203 "termination adapter" is not a straight pass-through, but contain an RC network, just as their lead sets that plug onto the probe cable do. This to provide high input impedance. It's documented in the manual for the termination adapter, which I've seen in paper form but can't find on the Agilent web site, or in "Probing Solutions for Logic Analyzers", Agilent document 5968-4632E, dated March 27, 2003: http://cp.literature.agilent.com/litweb/pdf/5968-4632E.pdf 8.2 pF target +------| (-------+ analyzer pod connector | | connector 250 ohm | 90.9 Kohm | signal -------/\/\/\----+-----/\/\/\-----+--------- signal ground -------- ground If you're building a target device intended to work with an HP/Agilent analyzer, you want the 20-pin connectors, or the newer "Mictor" high-density ones. If you want the target to be compatable with the HP/Agilent 40-pin probe cable connector, you have to put the RC networks on the target board. If you're building your own logic analyzer, and want to support HP/Agilent lead sets or termination adapters, you will have to take the RC network into consideration. Eric |
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Reply by ●January 27, 20052005-01-27
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--- In , "Eric Smith" <eric@b...> wrote: > > HP has several [logic analyzer probe] pinouts defined that > > you can work with. One is a 40 pin connector with 16 signal, 2 clock, > > 2 power (don't know why?) and 20 grounds. This is their cable end. > > You can use an adapter that they sell to condense this down to a 20 > > pin connector with just one ground and one power. > > Watch out! The HP/Agilent 20-pin target connector is at target (device) > logic levels, but the 40-pin probe cable connector is not. The > HP/Agilent 01650-63203 "termination adapter" is not a straight > pass-through, but contain an RC network, just as their lead sets that > plug onto the probe cable do. This to provide high input impedance. > It's documented in the manual for the termination adapter, which I've > seen in paper form but can't find on the Agilent web site, or in > "Probing Solutions for Logic Analyzers", Agilent document 5968-4632E, > dated March 27, 2003: > http://cp.literature.agilent.com/litweb/pdf/5968-4632E.pdf > > 8.2 pF > target +------| (-------+ analyzer pod > connector | | connector > 250 ohm | 90.9 Kohm | > signal -------/\/\/\----+-----/\/\/\-----+--------- signal > > ground -------- ground > If you're building a target device intended to work with an HP/Agilent > analyzer, you want the 20-pin connectors, or the newer "Mictor" > high-density ones. If you want the target to be compatable with the > HP/Agilent 40-pin probe cable connector, you have to put the RC networks > on the target board. > > If you're building your own logic analyzer, and want to support > HP/Agilent lead sets or termination adapters, you will have to take the > RC network into consideration. Thanks for the info. I have always used their 20 pin adapter, so I forgot about it containing the RC network. This is also covered in their App Note 1244-1 which I have uploaded to the files section of the AT91SAM7 group (since that is where I am using the connectors at the moment). I have looked at the Mictor connector, but I seem to recall that it has a downside. Maybe it is just not compatible with the older logic analyzers? Or maybe it is the cost, I know HP stuff is not cheap. I can't recall. |
