problem in loading from flash to spartan-3 xc3s200
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From: andfn on 28 Jul 2010 11:52 Hello, I'm learning to use FPGA, and i've designed and realized some schematic using spartan-3 xc3s200 (208 pin) and xcf01s, the last following UG332.pdf pag 68. I'm using the xilinx ise 9.2 updated sp4, and a digilent programmer like xilinx programmer. In impact, the .bit and the mcs file was correctly created, and I can program both devices without problems or error messages. In particular, I can create the .mcs file for the flash, I can program that, but when I turn off the power the FPGA can't load from the flash. I can program directly the flash and the program work well obviously until I turn off the power. I tried to see the signal CCLK (pin 104) with a scope but the signal was always high (I dont't see the 6Mhz clock..) I've set the CCLK option in fpga startup option, and (6 default) as configuration rate. I tryed to put to ground the pin 7 of XCF01S (cf connected to pin 207 of the xc3s200) but never happened. I've realized two schematic and both have the same problem. on the last schematic I've pulled high (2.5V) with a 4.7k resistor the prog_b, init_b pins, and to 3.3V with a 330 ohm the done pin. the other schematic links are: (flash)vcco = vccj = vccint = 3.3V (fpga)M0,M1,M2,HSWAP_EN = ground (flash)reset <-->(fpga)init_b (flash)CF <--->(fpga)prog_b (flash(D0)<--->(fpga)din (flash(tdi)<--->(fpga)tdo (flash)clk <--->(fpga)cclk (flash)tdo <--->(programmer)tdo (programmer)tms <--->(flash)tms (flash)tms <--->82ohm <--->tms (programmer)tck <--->(flash)tck (flash)tck) <---> 82ohm <---> (fpga)tck (programmer)tdi <---> 82ohm <---> (fpga)tdi (programmer)vref <---> 3.3V please, could you help me? thank you very much and regards. andrea francovich --------------------------------------- Posted through http://www.FPGARelated.com
From: Gabor on 28 Jul 2010 13:44
On Jul 28, 11:52 am, "andfn" <andfn(a)n_o_s_p_a_m.libero.it> wrote: > Hello, I'm learning to use FPGA, and i've designed and realized some > schematic > using spartan-3 xc3s200 (208 pin) and xcf01s, the last following UG332.pdf > pag 68. > > I'm using the xilinx ise 9.2 updated sp4, and a digilent programmer > like xilinx programmer. > > In impact, the .bit and the mcs file was correctly created, and I can > program > both devices without problems or error messages. > > In particular, I can create the .mcs file for the flash, I can program > that, but when I turn off the power the FPGA can't load from the > flash. > > I can program directly the flash and the program work well obviously until > I turn off the power. > > I tried to see the signal CCLK (pin 104) with a scope but the signal was > always high (I dont't see the 6Mhz clock..) > > I've set the CCLK option in fpga startup option, and (6 default) as > configuration rate. > > I tryed to put to ground the pin 7 of XCF01S (cf connected to pin 207 of > the xc3s200) but never happened. > > I've realized two schematic and both have the same problem. > > on the last schematic I've pulled high (2.5V) with a 4.7k resistor the > prog_b, init_b pins, and to 3.3V with a 330 ohm the done pin. > > the other schematic links are: > > (flash)vcco = vccj = vccint = 3.3V > > (fpga)M0,M1,M2,HSWAP_EN = ground > > (flash)reset <-->(fpga)init_b > (flash)CF <--->(fpga)prog_b > (flash(D0)<--->(fpga)din > (flash(tdi)<--->(fpga)tdo > (flash)clk <--->(fpga)cclk > > (flash)tdo <--->(programmer)tdo > > (programmer)tms <--->(flash)tms > (flash)tms <--->82ohm <--->tms > > (programmer)tck <--->(flash)tck > (flash)tck) <---> 82ohm <---> (fpga)tck > > (programmer)tdi <---> 82ohm <---> (fpga)tdi > > (programmer)vref <---> 3.3V > > please, could you help me? thank you very much and regards. > > andrea francovich > > --------------------------------------- > Posted throughhttp://www.FPGARelated.com You don't really need much to be running to get a CCLK from the FPGA. Check that your mode pins (M0 M1 M2) are really low - if you use a resistor to ground these it should be less than 1K Ohms. Other than that you need all power supplies (being able to program via JTAG seems to confirm these), and proper handling (pullups) on the PROG_B and INIT_B pins. There are some cases where the power-on sequence of supplies can affect configuration. These are covered in ug332. In any case pulling the PROG_B pin low momentarily should start the configuration even if there are power sequencing issues. So my top bet would be the mode pins. HTH, Gabor |