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Altera_Forum
Honored Contributor
17 years agoI want to know the max speed of NIOS ii based on cyclone iii EP3C120N780C
I have a DK-DSP-3C120N KIT,the NIOS II clock can not exceed 100mhz.The highest speed of NIOS II /f is now just 100mhz.The C program always dead when the clock exceed 100mhz.I want to working at least...
Altera_Forum
Honored Contributor
16 years agoThank you,BadOmen!
Your codes are working.All unconstrained paths has been cleared! After Report All Summaries,the report pane of TimeQuest display 2 red warning: 1)Summary (setup) Clock slack end point TNS inst|the_altpll_0|altpll1|pll3|clk[0] -1.167 -131.807 2)Summary(recovery) inst|the_altpll_0|altpll1|pll3|clk[0] -5.900 -78.992 To constraining PLL,I place this code in the .sdc file: create_clock -name {clk_50mhz} -period 20.000 -waveform { 0.000 10.000 } \[get_ports {clk_50mhz}] derive_pll_clocks derive_clock_uncertainty The input clock of the altpll is 50mhz,and output clock is 166.7mhz I don’t understand where the negative slack come from,and how to eliminate it. After compilation ,I receive 3 critical warning(Timing requirements not met) because of this.