Cmod A7 Vivado 2019: cannot get past implementation

[The_YongGrand]

Hello there,
I just got myself CMOD-A7 with Xilinx Vivado (latest), and I wanted to try to start with the simple LED blinking example. However, it never get past compiling at the Implementation or the Bitstream stage.
Here are my attempts starting from no. 1 to the end:
1.) Create new project.
2.) Added the CMOD-A7's constraints (cmodA7_B.xdc), and commented out the clock part and some GPIO ones:

Spoiler

## This file is a general .xdc for the CmodA7 rev. B
## To use it in a project:
## - uncomment the lines corresponding to used pins
## - rename the used ports (in each line, after get_ports) according to the top level signal names in the project

## 12 MHz Clock Signal
set_property -dict { PACKAGE_PIN L17   IOSTANDARD LVCMOS33 } [get_ports { sysclk }]; #IO_L12P_T1_MRCC_14 Sch=gclk
create_clock -add -name sys_clk_pin -period 83.33 -waveform {0 41.66} [get_ports {sysclk}];

## LEDs
set_property -dict { PACKAGE_PIN A17   IOSTANDARD LVCMOS33 } [get_ports { led[0] }]; #IO_L12N_T1_MRCC_16 Sch=led[1]
set_property -dict { PACKAGE_PIN C16   IOSTANDARD LVCMOS33 } [get_ports { led[1] }]; #IO_L13P_T2_MRCC_16 Sch=led[2]

## RGB LED
#set_property -dict { PACKAGE_PIN B17   IOSTANDARD LVCMOS33 } [get_ports { led0_b }]; #IO_L14N_T2_SRCC_16 Sch=led0_b
#set_property -dict { PACKAGE_PIN B16   IOSTANDARD LVCMOS33 } [get_ports { led0_g }]; #IO_L13N_T2_MRCC_16 Sch=led0_g
#set_property -dict { PACKAGE_PIN C17   IOSTANDARD LVCMOS33 } [get_ports { led0_r }]; #IO_L14P_T2_SRCC_16 Sch=led0_r

## Buttons
#set_property -dict { PACKAGE_PIN A18   IOSTANDARD LVCMOS33 } [get_ports { btn[0] }]; #IO_L19N_T3_VREF_16 Sch=btn[0]
#set_property -dict { PACKAGE_PIN B18   IOSTANDARD LVCMOS33 } [get_ports { btn[1] }]; #IO_L19P_T3_16 Sch=btn[1]

## Pmod Header JA
#set_property -dict { PACKAGE_PIN G17   IOSTANDARD LVCMOS33 } [get_ports { ja[0] }]; #IO_L5N_T0_D07_14 Sch=ja[1]
#set_property -dict { PACKAGE_PIN G19   IOSTANDARD LVCMOS33 } [get_ports { ja[1] }]; #IO_L4N_T0_D05_14 Sch=ja[2]
#set_property -dict { PACKAGE_PIN N18   IOSTANDARD LVCMOS33 } [get_ports { ja[2] }]; #IO_L9P_T1_DQS_14 Sch=ja[3]
#set_property -dict { PACKAGE_PIN L18   IOSTANDARD LVCMOS33 } [get_ports { ja[3] }]; #IO_L8P_T1_D11_14 Sch=ja[4]
#set_property -dict { PACKAGE_PIN H17   IOSTANDARD LVCMOS33 } [get_ports { ja[4] }]; #IO_L5P_T0_D06_14 Sch=ja[7]
#set_property -dict { PACKAGE_PIN H19   IOSTANDARD LVCMOS33 } [get_ports { ja[5] }]; #IO_L4P_T0_D04_14 Sch=ja[8]
#set_property -dict { PACKAGE_PIN J19   IOSTANDARD LVCMOS33 } [get_ports { ja[6] }]; #IO_L6N_T0_D08_VREF_14 Sch=ja[9]
#set_property -dict { PACKAGE_PIN K18   IOSTANDARD LVCMOS33 } [get_ports { ja[7] }]; #IO_L8N_T1_D12_14 Sch=ja[10]

## Analog XADC Pins
## Only declare these if you want to use pins 15 and 16 as single ended analog inputs. pin 15 -> vaux4, pin16 -> vaux12
#set_property -dict { PACKAGE_PIN G2    IOSTANDARD LVCMOS33 } [get_ports { xa_n[0] }]; #IO_L1N_T0_AD4N_35 Sch=ain_n[15]
#set_property -dict { PACKAGE_PIN G3    IOSTANDARD LVCMOS33 } [get_ports { xa_p[0] }]; #IO_L1P_T0_AD4P_35 Sch=ain_p[15]
#set_property -dict { PACKAGE_PIN J2    IOSTANDARD LVCMOS33 } [get_ports { xa_n[1] }]; #IO_L2N_T0_AD12N_35 Sch=ain_n[16]
#set_property -dict { PACKAGE_PIN H2    IOSTANDARD LVCMOS33 } [get_ports { xa_p[1] }]; #IO_L2P_T0_AD12P_35 Sch=ain_p[16]

## GPIO Pins
## Pins 15 and 16 should remain commented if using them as analog inputs
set_property -dict { PACKAGE_PIN M3    IOSTANDARD LVCMOS33 } [get_ports { pio1  }]; #IO_L8N_T1_AD14N_35 Sch=pio[01]
set_property -dict { PACKAGE_PIN L3    IOSTANDARD LVCMOS33 } [get_ports { pio2  }]; #IO_L8P_T1_AD14P_35 Sch=pio[02]
set_property -dict { PACKAGE_PIN A16   IOSTANDARD LVCMOS33 } [get_ports { pio3  }]; #IO_L12P_T1_MRCC_16 Sch=pio[03]
set_property -dict { PACKAGE_PIN K3    IOSTANDARD LVCMOS33 } [get_ports { pio4  }]; #IO_L7N_T1_AD6N_35 Sch=pio[04]
set_property -dict { PACKAGE_PIN C15   IOSTANDARD LVCMOS33 } [get_ports { pio5  }]; #IO_L11P_T1_SRCC_16 Sch=pio[05]
set_property -dict { PACKAGE_PIN H1    IOSTANDARD LVCMOS33 } [get_ports { pio6  }]; #IO_L3P_T0_DQS_AD5P_35 Sch=pio[06]
set_property -dict { PACKAGE_PIN A15   IOSTANDARD LVCMOS33 } [get_ports { pio7  }]; #IO_L6N_T0_VREF_16 Sch=pio[07]
set_property -dict { PACKAGE_PIN B15   IOSTANDARD LVCMOS33 } [get_ports { pio8  }]; #IO_L11N_T1_SRCC_16 Sch=pio[08]
set_property -dict { PACKAGE_PIN A14   IOSTANDARD LVCMOS33 } [get_ports { pio9  }]; #IO_L6P_T0_16 Sch=pio[09]
set_property -dict { PACKAGE_PIN J3    IOSTANDARD LVCMOS33 } [get_ports { pio10 }]; #IO_L7P_T1_AD6P_35 Sch=pio[10]
set_property -dict { PACKAGE_PIN J1    IOSTANDARD LVCMOS33 } [get_ports { pio11 }]; #IO_L3N_T0_DQS_AD5N_35 Sch=pio[11]
set_property -dict { PACKAGE_PIN K2    IOSTANDARD LVCMOS33 } [get_ports { pio12 }]; #IO_L5P_T0_AD13P_35 Sch=pio[12]
set_property -dict { PACKAGE_PIN L1    IOSTANDARD LVCMOS33 } [get_ports { pio13 }]; #IO_L6N_T0_VREF_35 Sch=pio[13]
set_property -dict { PACKAGE_PIN L2    IOSTANDARD LVCMOS33 } [get_ports { pio14 }]; #IO_L5N_T0_AD13N_35 Sch=pio[14]
set_property -dict { PACKAGE_PIN M1    IOSTANDARD LVCMOS33 } [get_ports { pio17 }]; #IO_L9N_T1_DQS_AD7N_35 Sch=pio[17]
set_property -dict { PACKAGE_PIN N3    IOSTANDARD LVCMOS33 } [get_ports { pio18 }]; #IO_L12P_T1_MRCC_35 Sch=pio[18]
set_property -dict { PACKAGE_PIN P3    IOSTANDARD LVCMOS33 } [get_ports { pio19 }]; #IO_L12N_T1_MRCC_35 Sch=pio[19]
set_property -dict { PACKAGE_PIN M2    IOSTANDARD LVCMOS33 } [get_ports { pio20 }]; #IO_L9P_T1_DQS_AD7P_35 Sch=pio[20]
set_property -dict { PACKAGE_PIN N1    IOSTANDARD LVCMOS33 } [get_ports { pio21 }]; #IO_L10N_T1_AD15N_35 Sch=pio[21]
set_property -dict { PACKAGE_PIN N2    IOSTANDARD LVCMOS33 } [get_ports { pio22 }]; #IO_L10P_T1_AD15P_35 Sch=pio[22]
set_property -dict { PACKAGE_PIN P1    IOSTANDARD LVCMOS33 } [get_ports { pio23 }]; #IO_L19N_T3_VREF_35 Sch=pio[23]
set_property -dict { PACKAGE_PIN R3    IOSTANDARD LVCMOS33 } [get_ports { pio26 }]; #IO_L2P_T0_34 Sch=pio[26]
set_property -dict { PACKAGE_PIN T3    IOSTANDARD LVCMOS33 } [get_ports { pio27 }]; #IO_L2N_T0_34 Sch=pio[27]
set_property -dict { PACKAGE_PIN R2    IOSTANDARD LVCMOS33 } [get_ports { pio28 }]; #IO_L1P_T0_34 Sch=pio[28]
set_property -dict { PACKAGE_PIN T1    IOSTANDARD LVCMOS33 } [get_ports { pio29 }]; #IO_L3P_T0_DQS_34 Sch=pio[29]
set_property -dict { PACKAGE_PIN T2    IOSTANDARD LVCMOS33 } [get_ports { pio30 }]; #IO_L1N_T0_34 Sch=pio[30]
set_property -dict { PACKAGE_PIN U1    IOSTANDARD LVCMOS33 } [get_ports { pio31 }]; #IO_L3N_T0_DQS_34 Sch=pio[31]
set_property -dict { PACKAGE_PIN W2    IOSTANDARD LVCMOS33 } [get_ports { pio32 }]; #IO_L5N_T0_34 Sch=pio[32]
set_property -dict { PACKAGE_PIN V2    IOSTANDARD LVCMOS33 } [get_ports { pio33 }]; #IO_L5P_T0_34 Sch=pio[33]
set_property -dict { PACKAGE_PIN W3    IOSTANDARD LVCMOS33 } [get_ports { pio34 }]; #IO_L6N_T0_VREF_34 Sch=pio[34]
set_property -dict { PACKAGE_PIN V3    IOSTANDARD LVCMOS33 } [get_ports { pio35 }]; #IO_L6P_T0_34 Sch=pio[35]
set_property -dict { PACKAGE_PIN W5    IOSTANDARD LVCMOS33 } [get_ports { pio36 }]; #IO_L12P_T1_MRCC_34 Sch=pio[36]
set_property -dict { PACKAGE_PIN V4    IOSTANDARD LVCMOS33 } [get_ports { pio37 }]; #IO_L11N_T1_SRCC_34 Sch=pio[37]
set_property -dict { PACKAGE_PIN U4    IOSTANDARD LVCMOS33 } [get_ports { pio38 }]; #IO_L11P_T1_SRCC_34 Sch=pio[38]
set_property -dict { PACKAGE_PIN V5    IOSTANDARD LVCMOS33 } [get_ports { pio39 }]; #IO_L16N_T2_34 Sch=pio[39]
set_property -dict { PACKAGE_PIN W4    IOSTANDARD LVCMOS33 } [get_ports { pio40 }]; #IO_L12N_T1_MRCC_34 Sch=pio[40]
set_property -dict { PACKAGE_PIN U5    IOSTANDARD LVCMOS33 } [get_ports { pio41 }]; #IO_L16P_T2_34 Sch=pio[41]
set_property -dict { PACKAGE_PIN U2    IOSTANDARD LVCMOS33 } [get_ports { pio42 }]; #IO_L9N_T1_DQS_34 Sch=pio[42]
set_property -dict { PACKAGE_PIN W6    IOSTANDARD LVCMOS33 } [get_ports { pio43 }]; #IO_L13N_T2_MRCC_34 Sch=pio[43]
set_property -dict { PACKAGE_PIN U3    IOSTANDARD LVCMOS33 } [get_ports { pio44 }]; #IO_L9P_T1_DQS_34 Sch=pio[44]
set_property -dict { PACKAGE_PIN U7    IOSTANDARD LVCMOS33 } [get_ports { pio45 }]; #IO_L19P_T3_34 Sch=pio[45]
set_property -dict { PACKAGE_PIN W7    IOSTANDARD LVCMOS33 } [get_ports { pio46 }]; #IO_L13P_T2_MRCC_34 Sch=pio[46]
set_property -dict { PACKAGE_PIN U8    IOSTANDARD LVCMOS33 } [get_ports { pio47 }]; #IO_L14P_T2_SRCC_34 Sch=pio[47]
set_property -dict { PACKAGE_PIN V8    IOSTANDARD LVCMOS33 } [get_ports { pio48 }]; #IO_L14N_T2_SRCC_34 Sch=pio[48]

## UART
#set_property -dict { PACKAGE_PIN J18   IOSTANDARD LVCMOS33 } [get_ports { uart_rxd_out }]; #IO_L7N_T1_D10_14 Sch=uart_rxd_out
#set_property -dict { PACKAGE_PIN J17   IOSTANDARD LVCMOS33 } [get_ports { uart_txd_in  }]; #IO_L7P_T1_D09_14 Sch=uart_txd_in

## Crypto 1 Wire Interface
#set_property -dict { PACKAGE_PIN D17   IOSTANDARD LVCMOS33 } [get_ports { crypto_sda }]; #IO_0_14 Sch=crypto_sda

## QSPI
#set_property -dict { PACKAGE_PIN K19   IOSTANDARD LVCMOS33 } [get_ports { qspi_cs    }]; #IO_L6P_T0_FCS_B_14 Sch=qspi_cs
#set_property -dict { PACKAGE_PIN D18   IOSTANDARD LVCMOS33 } [get_ports { qspi_dq[0] }]; #IO_L1P_T0_D00_MOSI_14 Sch=qspi_dq[0]
#set_property -dict { PACKAGE_PIN D19   IOSTANDARD LVCMOS33 } [get_ports { qspi_dq[1] }]; #IO_L1N_T0_D01_DIN_14 Sch=qspi_dq[1]
#set_property -dict { PACKAGE_PIN G18   IOSTANDARD LVCMOS33 } [get_ports { qspi_dq[2] }]; #IO_L2P_T0_D02_14 Sch=qspi_dq[2]
#set_property -dict { PACKAGE_PIN F18   IOSTANDARD LVCMOS33 } [get_ports { qspi_dq[3] }]; #IO_L2N_T0_D03_14 Sch=qspi_dq[3]

## Cellular RAM
#set_property -dict { PACKAGE_PIN M18   IOSTANDARD LVCMOS33 } [get_ports { MemAdr[0]  }]; #IO_L11P_T1_SRCC_14 Sch=sram- a[0]
#set_property -dict { PACKAGE_PIN M19   IOSTANDARD LVCMOS33 } [get_ports { MemAdr[1]  }]; #IO_L11N_T1_SRCC_14 Sch=sram- a[1]
#set_property -dict { PACKAGE_PIN K17   IOSTANDARD LVCMOS33 } [get_ports { MemAdr[2]  }]; #IO_L12N_T1_MRCC_14 Sch=sram- a[2]
#set_property -dict { PACKAGE_PIN N17   IOSTANDARD LVCMOS33 } [get_ports { MemAdr[3]  }]; #IO_L13P_T2_MRCC_14 Sch=sram- a[3]
#set_property -dict { PACKAGE_PIN P17   IOSTANDARD LVCMOS33 } [get_ports { MemAdr[4]  }]; #IO_L13N_T2_MRCC_14 Sch=sram- a[4]
#set_property -dict { PACKAGE_PIN P18   IOSTANDARD LVCMOS33 } [get_ports { MemAdr[5]  }]; #IO_L14P_T2_SRCC_14 Sch=sram- a[5]
#set_property -dict { PACKAGE_PIN R18   IOSTANDARD LVCMOS33 } [get_ports { MemAdr[6]  }]; #IO_L14N_T2_SRCC_14 Sch=sram- a[6]
#set_property -dict { PACKAGE_PIN W19   IOSTANDARD LVCMOS33 } [get_ports { MemAdr[7]  }]; #IO_L16N_T2_A15_D31_14 Sch=sram- a[7]
#set_property -dict { PACKAGE_PIN U19   IOSTANDARD LVCMOS33 } [get_ports { MemAdr[8]  }]; #IO_L15P_T2_DQS_RDWR_B_14 Sch=sram- a[8]
#set_property -dict { PACKAGE_PIN V19   IOSTANDARD LVCMOS33 } [get_ports { MemAdr[9]  }]; #IO_L15N_T2_DQS_DOUT_CSO_B_14 Sch=sram- a[9]
#set_property -dict { PACKAGE_PIN W18   IOSTANDARD LVCMOS33 } [get_ports { MemAdr[10] }]; #IO_L16P_T2_CSI_B_14 Sch=sram- a[10]
#set_property -dict { PACKAGE_PIN T17   IOSTANDARD LVCMOS33 } [get_ports { MemAdr[11] }]; #IO_L17P_T2_A14_D30_14 Sch=sram- a[11]
#set_property -dict { PACKAGE_PIN T18   IOSTANDARD LVCMOS33 } [get_ports { MemAdr[12] }]; #IO_L17N_T2_A13_D29_14 Sch=sram- a[12]
#set_property -dict { PACKAGE_PIN U17   IOSTANDARD LVCMOS33 } [get_ports { MemAdr[13] }]; #IO_L18P_T2_A12_D28_14 Sch=sram- a[13]
#set_property -dict { PACKAGE_PIN U18   IOSTANDARD LVCMOS33 } [get_ports { MemAdr[14] }]; #IO_L18N_T2_A11_D27_14 Sch=sram- a[14]
#set_property -dict { PACKAGE_PIN V16   IOSTANDARD LVCMOS33 } [get_ports { MemAdr[15] }]; #IO_L19P_T3_A10_D26_14 Sch=sram- a[15]
#set_property -dict { PACKAGE_PIN W16   IOSTANDARD LVCMOS33 } [get_ports { MemAdr[16] }]; #IO_L20P_T3_A08_D24_14 Sch=sram- a[16]
#set_property -dict { PACKAGE_PIN W17   IOSTANDARD LVCMOS33 } [get_ports { MemAdr[17] }]; #IO_L20N_T3_A07_D23_14 Sch=sram- a[17]
#set_property -dict { PACKAGE_PIN V15   IOSTANDARD LVCMOS33 } [get_ports { MemAdr[18] }]; #IO_L21P_T3_DQS_14 Sch=sram- a[18]
#set_property -dict { PACKAGE_PIN W15   IOSTANDARD LVCMOS33 } [get_ports { MemDB[0]   }]; #IO_L21N_T3_DQS_A06_D22_14 Sch=sram-dq[0]
#set_property -dict { PACKAGE_PIN W13   IOSTANDARD LVCMOS33 } [get_ports { MemDB[1]   }]; #IO_L22P_T3_A05_D21_14 Sch=sram-dq[1]
#set_property -dict { PACKAGE_PIN W14   IOSTANDARD LVCMOS33 } [get_ports { MemDB[2]   }]; #IO_L22N_T3_A04_D20_14 Sch=sram-dq[2]
#set_property -dict { PACKAGE_PIN U15   IOSTANDARD LVCMOS33 } [get_ports { MemDB[3]   }]; #IO_L23P_T3_A03_D19_14 Sch=sram-dq[3]
#set_property -dict { PACKAGE_PIN U16   IOSTANDARD LVCMOS33 } [get_ports { MemDB[4]   }]; #IO_L23N_T3_A02_D18_14 Sch=sram-dq[4]
#set_property -dict { PACKAGE_PIN V13   IOSTANDARD LVCMOS33 } [get_ports { MemDB[5]   }]; #IO_L24P_T3_A01_D17_14 Sch=sram-dq[5]
#set_property -dict { PACKAGE_PIN V14   IOSTANDARD LVCMOS33 } [get_ports { MemDB[6]   }]; #IO_L24N_T3_A00_D16_14 Sch=sram-dq[6]
#set_property -dict { PACKAGE_PIN U14   IOSTANDARD LVCMOS33 } [get_ports { MemDB[7]   }]; #IO_25_14 Sch=sram-dq[7]
#set_property -dict { PACKAGE_PIN P19   IOSTANDARD LVCMOS33 } [get_ports { RamOEn     }]; #IO_L10P_T1_D14_14 Sch=sram-oe
#set_property -dict { PACKAGE_PIN R19   IOSTANDARD LVCMOS33 } [get_ports { RamWEn     }]; #IO_L10N_T1_D15_14 Sch=sram-we
#set_property -dict { PACKAGE_PIN N19   IOSTANDARD LVCMOS33 } [get_ports { RamCEn     }]; #IO_L9N_T1_DQS_D13_14 Sch=sram-ce

 3.) Using the Clocking Wizard, I have created the block with 100M and 12M outputs (as an example, based on this: https://forum.digilentinc.com/topic/9419-using-vivado-ip-clocking-wizard-with-the-cmod-a7-35t/)
The outputs are named clk_100 and clk_12 for now.
Inputs is named clk_in, and the "sysclk" come from the constraints file.
4.) Generated the clock module, "out of context per IP".
5.) After generating, opened the clock module's VEO file and copied that implementation part: 

Quote

clk_wiz_0 instance_name
    (
     // Clock out ports
     .clk_100(clk_100),     // output clk_100
     .clk_12(clk_12),     // output clk_12
    // Clock in ports
     .clk_in1(clk_in1));      // input clk_in1

6.) Pasted and modified it onto the example verilog file:

Quote

module hello(
     input clk,
     output LED
 );
clk_wiz_0 mmcm_inst
    (
     // Clock out ports
     .clk_100(clk_100),     // output clk_100
     .clk_12(clk),     // output clk_12
    // Clock in ports
     .clk_in1(sysclk));      // input clk_in1
reg [23:0] cnt;
 always @(posedge clk) cnt <= cnt + 24'd1;
assign LED = cnt[23];
 endmodule

7.) Synthesis can be completed, but not implementation. The error:

Quote

[DRC MDRV-1] Multiple Driver Nets: Net mmcm_inst/inst/clk_12 has multiple drivers: mmcm_inst/inst/clkout2_buf/O, and clk_IBUF_inst/O.

Are there any steps I missed out so far?
 
I could compile okay on a Quartus 2 and generated a clock module at an instant there, and I'm curious if I could do the same on Vivado? Something like this:

Hope I can get a good guidance on this. Thanks.

[jpeyron]

Hi @The_YongGrand,

Welcome to the Digilent Forums!

Here is a Vivado 2018.2 Cmod A7 35T GPIO project that uses the clocking wizard. I was able to get this project to generate a bitstream in "Vivado 2019.1". Once you have loaded the project into Vivado 2019.1 you will need to upgrade the clocking wizard. Then generate the bitstream. 

I have attached screen shots that should help with this process.

best regards,

Jon

[The_YongGrand]

Hello @jpeyron, thanks for the hint. I attempted this, and the bitstream got compiled.

 

However, I would like to work on the "Block Design" and get the bitstream to be compiled, but failed. Since I previously worked on Quartus 2, the "Block Design" format will be more familiar with me, but all the tutorials I have searched did not address a simple Verilog LED blinking with the format. Either it is all with a Microblaze or a very complicated project.

 

Here are my attempts:

1.) Create new project. 

2.) IP Integrator -> Create Block Design. I named it "system".

3.) Dragged the "System Clock" (in that picture) onto that blank diagram area:

  

4.) "Add module", put my example Verilog file, which is already on the first post. Then connect all the wires:

5.) Synthesis and Implementation passed, but not Bitstream. It complained about this:

That IO port at the right "led[1:0]" is from the constraint file. I have even added this in the constraint file:

Quote

set_property CONFIG_VOLTAGE 3.3 [current_design]
set_property CFGBVS VCCO [current_design]

What I do not understand is:

1.) Which IO the "reset" and the "sys_clock" port on the clk_wiz_0 is from? Is it defined? I saw buttons and the sysclk from the constraints file, but I don't get to see how it is connected to the block.

2.) the "clk" is connected to "clk_out1", and does not involve IO at all. It is wired internally, but toolchain flagged an error on this one?

3.) Same as (2), the led[1:0] is from the constraints file, and the error as well.

 

I could easily do this in Quartus 2 without errors and I'm wondering if there are anything else I missing over there. I got this little Cmod-A7 because it has more features than my old generation Cyclone2.

 

[jpeyron]

Hi @The_YongGrand,

Looking at your block design and the errors the XDC does not match the block design. There are 2 outputs from the test1_0.

The board files handle constraining the sys_clock since you are using the Cmod A7 board files and have added the clocking wizard from the boards tab.

You should not be adding a clock in the hello module either.

I have created and confirmed a Cmod A7 led project in Vivado 2019.1 here that blinks the led based on the clock on a Cmod A7 35T using Verilog.

after adding the verilog code using the add a module function i right click on the led port and selected make external.

I then alter the name removing the generated _0 part of the signal name. 

Make sure that after you are finished with your block design that you create a wrapper(top file). 

I have also attached screen shots of the xdc,wrapper,verilog code...

best regards,

Jon

[The_YongGrand]

Hello @jpeyron, thanks for the responses. I'll try that the next day as I'm away from the desktop now and will report whether it works or not. ?

[The_YongGrand]

Hey there @jpeyron, just tried following the instructions, and got the bitstream! Didn't know that the wrapper is important to that particular toolset.

I'm gonna try to download it into the A7 and report the results tomorrow, as it's late for today!

If all that works wonderful, I'm gonna write a tutorial here and on my page too.

[jpeyron]

Hi @The_YongGrand,

Glad to hear you were able to get a bitstream! Thank you for sharing what you did to resolve the issue.

best regards,

Jon

[The_YongGrand]

Hello @jpeyron, I have successfully uploaded this bitstream into the Cmod-A7! :) Writing a simple tutorial now for reference! :)

[jpeyron]

Hi @The_YongGrand,

Glad you are able to upload a bitstream to the Cmod A7 with out an issue! 

cheers,

Jon

[PoojaN]

On 7/9/2019 at 11:37 AM, jpeyron said:

Hi @The_YongGrand,

Looking at your block design and the errors the XDC does not match the block design. There are 2 outputs from the test1_0.

The board files handle constraining the sys_clock since you are using the Cmod A7 board files and have added the clocking wizard from the boards tab.

You should not be adding a clock in the hello module either.

I have created and confirmed a Cmod A7 led project in Vivado 2019.1 here that blinks the led based on the clock on a Cmod A7 35T using Verilog.

after adding the verilog code using the add a module function i right click on the led port and selected make external.

I then alter the name removing the generated _0 part of the signal name. 

Make sure that after you are finished with your block design that you create a wrapper(top file). 

I have also attached screen shots of the xdc,wrapper,verilog code...

best regards,

Jon

@jpeyron I tried to use this file with CMOD A7. I was able to generate the bitstream with this project, but when i tried to upload it to the CMOD, i got the following error

 

 

Did I do anything wrong?

-P

[jpeyron]

Hi @PoojaN,

I believe that this error is stating that there is a sudden voltage drop as discussed in this xilinx forum thread. How are you powering the Cmod A7? If through the usb uart bridge have you tried using a different usb cable?

best regards,

Jon

[PoojaN]

Hi @jpeyron 

Thank You!!

There was a problem with the cord. I don't know why that would happen though, as I have been using this cord for a long time and it works with the other boards.

Cheers!!

-P

[jpeyron]

Hi @PoojaN,

Glad to hear that changing the usb cable fixed the issue!

best regards,

Jon