set_output_delay -clock clk_ddr -max 2.1 [get_ports DDR_OUT] set_output_delay -clock clk_ddr -max 1.9 [get_ports DDR_OUT] -clock_fall -add_delay set_output_delay -clock clk_ddr -min 0.9 [get_ports DDR_OUT] set_output_delay -clock clk_ddr -min 1.1 [get_ports DDR_OUT] -cloc...
e)输入时延设置到DDR的数据输入引脚DDR_IN ,数据被clk_ddr的上升沿和下降沿触发,到FPGA内部FF的数据输入端口,对上升沿和下降沿都敏感 create_clock -name clk_ddr -period 6 [get_ports DDR_CLK_IN] set_input_delay -clock clk_ddr -max 2.1 [get_ports DDR_IN] set_input_delay -clock clk_ddr -...
-clock_fall :指明外部寄存器用该时钟的下降沿采样数据;常用于DDR接口 -add_delay:指明还有另一个外部寄存器与该端口相连;常用于DDR接口
All the manuals on set_output_delay constraint suggest shift the output clock by 90 degree when using DDR. I shifted the output clock by 180 degree, then the IO timing errors vanished. However, the setup slack is 0.28 ns, and the hold slack is 1.72 ns. What else can I do to ...
The design includes 16 LVDS DDR channels and 4GHz, and if I modify the setting to a wrong value we get wrong data. Regards Translate 0 Kudos Copy link Reply KhaiChein_Y_Intel Employee 10-22-2019 05:42 AM 2,636 Views Hi, May I know ...
$output_ports] -max_paths 20 -nworst 2 -delay_type min_max -name src_sync_ddr_out_rise -file src_sync_ddr_out_rise.txt; # report_timing -fall_to [get_ports $output_ports] -max_paths 20 -nworst 2 -delay_type min_max -name src_sync_ddr_out_fall -file src_sync_ddr_out_fall...
create_generated_clock -name fpga2_clk_ext -source [get_pins {PLLFORDDRCLK|altpll_component|auto_generated|pll1|clk[1]}] -divide_by 1 -multiply_by 1 -invert [get_ports {fpga2_sampling_clk}] set_output_delay fpga2_clk_ext -max... set_output_delay fpga2_clk_ext -min....
The Fast I/O assignments don't work on DDR, so you have to use the MegaWizard/IP Console to create the altddio megafunction, and once done it will always be put in the I/O cell. This is unlike a SDR register, which can be done in RTL, is put into the I...
It's hard to run a regular source-sync DDR interface above 200Mbps in Arria 10. (If you use the altlvds block that doesn't require timing constraints, you can go above 1Gbps, and 1.6Gbps with DPA...) Translate 0 Kudos Copy link Reply ...
It's hard to run a regular source-sync DDR interface above 200Mbps in Arria 10. (If you use the altlvds block that doesn't require timing constraints, you can go above 1Gbps, and 1.6Gbps with DPA...) 0 Kudos Copy link Reply ...