No Change Timing Check 示例中,addr提前write下降沿4.5个time unit, addr晚于write上升沿3.5个time unit。 (二)SDF3.0 Timing Environment Entries SDF3.0 Timing Environment Entries分成Constraints与Timing Environment两个部分,首先解析Constraints。 1.Constraints 首先,SDF3.0 Timing Environment包括以下几类constraints: ...
(一)SDF3.0 Timing Checks主要分以下两种: VCS/NC-Verilog后仿真在timing violation时报出warning; Timing Sign-Off工具报出timing check violations; 以时序分析工具Sign-Off为主,后仿为辅,SDF3.0Timing Checks具体的类型如下: Setup Timing Check Hold Timing Check SetupHold Timing Check 注意,示例中~reset必须为...
1,仿真参数:去掉+nospecify +notimingcheck -add_dwq_delay 0.01ns 2,使用$sdf_annotate将延时加入网表 所谓的SDF文件就是:Standard delay file,它是把布局布线过程中器件延时和线延时的信息保留下来,据此就…
Warning-[SDFCOM_CFTC] Cannot find timing check RNSFIR-post_syn.sdf, 1466382 module: FD2QSVTX2, "instance: E.UUT.\fir_19/rey_051/z_reg[0] " SDF Warning: Cannot find timing check $hold(posedge CP,posedge CD,...) The memory cell SDF is as follow: (CELL (CELLTYPE "FD2QSVTX2")...
SDF files are produced by implementation tools and contain delay data and timing checks.Active-HDLsupports the latest version of SDF. InVHDLdesigns, data from SDF file can be loaded by passing the appropriate arguments to the asim command when simulation is initialized. You can also specify SDF...
1.1 综合团队/后端团队release综合网表给DV进行仿真,这一步可以称为zero delay GLS(gate level simulation), 也可以干脆称为综合网表仿真。注意,不带延时反标的综合网表仿真,需要加上 nospecify 和 notimingcheck 这两个编译选项。 1.2 后端团队PR网表时序收敛得差不多的时候,用EDA工具提取出延时信息SDF,和PR网...