Agilex5: How to use a GTS refclk to clock the FPGA fabric?
- 11 days ago
Hi,
posted minimal design doesn't work because it doesn't connect system PLL output to anything, thus the PLL is discarded during synthesis.
Modified top.sv respectivelyassign {//pad_rled0, pad_gled0, pad_bled0, pad_rled1, pad_gled1, pad_bled1, pad_rled2, pad_gled2, pad_bled2, pad_rled3, pad_gled3, pad_bled3} = 11'o213; //12'o4213; assign pad_dbg_tx = pad_dbg_rx; assign pad_rled0 = clk101p768092; assign clk101p768092_ready = 1'b1;
Connecting the PLL reveals another error. The fact that you never got to this point suggests that the PLL wasn't implemented in your design, e.g. due to missing connectivity.Error(22849): Intel FPGA IP instantiated in the design requires the DEVICE_INITIALIZATION_CLOCK option to be set to either OSC_CLK_1_25MHZ, OSC_CLK_1_100MHZ, or OSC_CLK_1_125MHZ. This assignment is missing in the QSF file.
Added
set_global_assignment -name DEVICE_INITIALIZATION_CLOCK OSC_CLK_1_100MHZ
Get still complains about missing constraints, but design basically compiles now.
Regards
Frank
P.S.: Don't know, if DEVICE_INITIALIZATION_CLOCK is actually required to run system_pll. GTS PHY itself needs it according to device handbook.