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Honored Contributor
Honored ContributorLED toggle
I'm trying what I thought would be a very simple programme to turn alternate LEDs ON and OFF every half second, but it isn't working as it should. It starts off OK, with the LEDs toggling about every...
Altera_ForumHonored Contributor
Honored ContributorI didn't know there was a timing report - I guess I should do a lot more reading before I jump in.
I clicked on a TimeQuest link and copied parts of various reports. They mean nothing to me, but you might be able to see quickly where the problem lies. =============================================================================================== Info: No user constrained base clocks found in the design. Calling "derive_clocks -period 1.0" Info: Deriving Clocks Info: create_clock -period 1.000 -name clk clk Critical Warning: Timing requirements not met Info: Worst-case setup slack is -12.688 Info: Slack End Point TNS Clock Info: ========= ============= ===================== Info: -12.688 -347.450 clk Critical Warning: QSF: Expected ENABLE_CLOCK_LATENCY to be set to 'ON', but it is set to 'OFF' Critical Warning: In SDC, create_generated_clock auto-generates clock latency Info: Generated Test.sdc Info: -------------------------------------------------------- 0 create_timing_netlist -model slow check timing no_clock 0 multiple_clock 0 pos_neg_clock_domain 0 generated_clock 0 virtual_clock 1 no_input_delay 0 no_output_delay 2 partial_input_delay 0 partial_output_delay 0 io_min_max_delay_consistency 0 reference_pin 0 generated_io_delay 0 latency_override 0 partial_multicycle 0 multicycle_consistency 0 loops 0 latches 0 pll_cross_check 0 uncertainty 1 partial_min_max_delay 0 clock_assignments_on_output_ports 0 input_delay_assigned_to_clock 0 [1] -12.688 COUNT[8] COUNT[23] clk clk 1.000 0.000 13.355 . . . . [1000] -3.811 COUNT[9] COUNT[20] clk clk 1.000 0.000 4.478 regards
