未设置max/min delay约束时,存在d1到ff2_reg/D和ff3_reg/D的时序路径 添加d1到ff2_reg/D的max delay约束,约束的from和to为有效的时序起点和终点 set_max_delay -from [get_ports d1] -to [get_pins ff2_reg/D] 1.0 时序报告如下,d1到ff2_reg/D和ff3_reg/D的路径依旧有效 3.1.1无效的约束对象 ...
-through选项、-rise_through选项、-fall_through选项需要设置为虚假路径的时序路径的途经点列表,它们可以指定多个,表示依次途径每个列表中的一个对象的时序路径,它们可以以混合使用。 -through选项指定了时序路径的途径点,它的参数是一个对象列表,如果有多于一个对象,需要使用引号或大括号包围。对象可以是端口,代表着时...
时序约束之 set_max_delay / set_min_delay 查看原文 时序约束搜集整理 恢复时间)需求;最小延迟约束set_min_delay用于改写路径的默认保持时间(或移除时间)。两条约束命令的语法模板如下:set_max_delay<delay>; [-datapath_only] [-from<node_list>;] [-to<node_list>;] [-through <node_list>;]set_min...
Syntax set_max_delay [-h | -help] [-long_help] [-fall_from <names> ] [-fall_to <names> ] [-from <names> ] [-rise_from <names> ] [-rise_to <names> ] [-through <names> ] [-to <names> ] <value> Arguments -h | -help Short help -long_help Long help with examples ...
[-through through_list] [-to to_list] path_multiplier:默认值setup时为1,hold时为0; setup|hold:表明多周期路径设置是对setup(max_delay)或者是hold(min_delay),setup时默认移动capture_clk,hold时默认移动launch_clk; start:表示强制移动的为start clock即launch clock; ...
The following example sets a maximum delay by constraining all paths to output ports whose names start by “out” with a delay less than 3.8 ns:set_max_delay 3.8 -to [get_ports out*]Actel Implementation SpecificsThe –through option in the set_max_delay SDC command is not supported....
create_clock-period5.000-name src_clk-waveform{0.0002.500}[get_ports src_clk]create_clock-period2.500-name dest_clk-waveform{0.0001.250}[get_ports dest_clk]set_max_delay-from[get_cells src_send_reg]-through[get_cells{{out_reg[0]}{out_reg[1]}}]10.000set_bus_skew-from[get_cells{{src...
set_min_delay -from spi_master_wrap_u|spi_tx_u|tx_sck_o|q -through spi_master_wrap_u|sck_o~0|combout -to m_spi_ck_o~output|i 0.200 set_max_delay -from spi_master_wrap_u|spi_tx_u|tx_sck_o|q -through spi_master_wrap_u|sck_o~0|combout -to ...
[-through through_list] [-to to_list] path_multiplier:默认值setup时为1,hold时为0; setup|hold:表明多周期路径设置是对setup(max_delay)或者是hold(min_delay),setup时默认移动capture_clk,hold时默认移动launch_clk; start:表示强制移动的为start clock即launch clock; ...
I delay the data_enable signal by a few (e.g. 2 or 3) clock cycles (in the orignal clock domain) to give enough time to the data to propagate through. I want to set the max delay for the data to be equal to the total delay of those (2 or 3) clock cycles (by which the ...