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  1. @[email protected], I am using Cmod A7 (ARTIX-7). I am not using microblaze now, because I am testing only clock part. My purpose is making 40MHz(differential mode) with 100MHz external oscillator(differential) (this is cmod A7's reference manual) Thank you. Park
  2. Thank you for your advice, but even when I followed your tips, the result was same(failed). Now I wonder if the cause of this problem is local power. The local power supply has only 3.3V, 1.8V and 1.0V. And there are no 2.5V power. So LVDS_25's 2.5V seems like not generatred. I suspect this is the cause. I'm curious about your opinion. Thank you. -S. Park-
  3. Hi there! I'm trying to make differential clock(100MHz from oscillator) to differential clock output(40MHz differential) clk_100M_P&M is connected to external crystal oscillator(input) and I allocated clk_40_P&M to PIO port(output). clk_front , clk_back is for check point. when I checked, the result was : clk_front : 100MHz & clk_back : 40MHz . However, clk_40_P &N port didn't output some waveform. I have no idea what's the problem. 1st trial : clk_front & back : LVCmos33 and clk_40_P & N : LVDS25 -> result : LVCmos33,(bank34) clk_front & back (success) and (bank35) clk_40_P & N : LVDS25 ( failed ) 2nd trial : clk_front & back : LVCmos25 and clk_40_P & N : LVDS25 -> result : LVCmos25 ,(bank35) clk_front & back (success) and (bank35) clk_40_P & N : LVDS25 ( failed ) thank you for your help!
  4. Hello everyone. I am learning UART communication with Nexys video board. Using only IP integrator, I succeed to 'turn on the LEDs with SWs' and now, I tried to use custom counter module by Verilog. module clock_divider( input clk, input [4:0]key, output reg [7:0]led ); //we will need one register to keep the clock count number; reg [22:0] count; always @(posedge clk) // judge the clk rise edge; if (key) begin // if the key has been pressed, if(count==0) begin // then count value flip over to zero, then make led on or off led <= ~led; // in the always loop, it needs to use registers end count <= count +1; // add the count value until it flips over to zero end else begin // if there is no key to be pressed, init the led to off state; led <=0; count <=1; end endmodule and I included this module in IP design. and the errors were like below. before this errors, I connected slight different module~IP wiring , and the result was ' synthesis & implement succeed, Bitstream failed' I'm looking for some information on google, but hard to find out my problem. can you give me some hints or solution? Thank you for your kind answers, ...
  5. Hello, I bought new nexysvideo board. I read the 'important' message "press reset cpu button before turn off the board power", however I turned off the board power without pressing 'cpu reset' button by mistake. Therefore, board seems like it does not works. When I turn on the power, heat sink has no heat and OLED is turned off. Also when I toggle the switch, the LED doesn't turn on/off (remain off). Is there any solution to resolve this problem? If no, how can I repair this board? thank you.