.CLKIN(clk_in), .RST(1'b0), .CLKFBIN(clkfbout), .CLKFBOUT(clkfbout), .CLKOUT0(clkout0), .LOCKED(locked) ); assign clk_out = clkout0; 通过上述代码,就可以实现对时钟信号的动态调相了。 五、总结 MMCM动态调相是一种非常重要的FPGA设计技术,它可以帮助我们实现对时钟信号的精确控制,提高系统的...
to 1600MHz, in the -3. So, the -3 speed grade will just barely make it; set both CLKFB...
.CLKFBOUT_USE_FINE_PS("FALSE"), // Fine phase shift enable (TRUE/FALSE).CLKIN1_PERIOD(0.0), // Input clock period in ns to ps resolution (i.e. 33.333 is 30 MHz)..CLKIN2_PERIOD(0.0), // Input clock period in ns to ps resolution (i.e. 33.333 is 30 MHz)..CLKOUT0_...
This divider is set with the CLKFBOUT_MULT attribute when instantiating the MMCM_DRP module. The lock group has an effect on the MMCMs ability to detect that it is locked. The lookup table is located in the reference design within mmcm_drp_func.h . Filter Group This group cannot be ...
Phase error is the phase (or time) difference between the rising edges of CLKIN and CLKFBIN. The value measured is a median value. Phase error can also be called as Phase Offset. The variation of the above said phase (or time) difference is called phase jitter. The value is measured ...
If that does not work, adjust either the input period CLKINx_PERIOD (0.833333), multiplication factor CLKFBOUT_MULT_F (20.000000) or the division factor DIVCLK_DIVIDE (1), in order to achieve a VCO frequency within the rated operating range for this device. Thanks in advance Prasa...
FVCO = 1000*CLKFBOUT_MULT_F/(CLKIN1_PERIOD*DIVCLK_DIVIDE)). CLKIN1_PERIOD is from the period constraint of UCF. The cause of this error message, is that the period constraint for the input of MMCM must be different from the frequency set in Coregen. ...