• There are two timing path types : max and min. •Path type: max - reports timing paths that check setup violations. •Path type: min - reports timing paths that check hold violations. • Design Compiler works primarily on the most critical path in each path group. 首先,每个creat...
path type是max表示longest path,属于setup check,如果是min表示hold timing check clock network delay,当clock tree没有建立时候,显示network delay是ideal,建立后,propagated 上图required_time(需要传输时间) - arrival_time(实际数据时间) = slack 为正数,说明数据传输速度快,可以达到,因此setup time通过。 Removal...
set_clock_uncertainty -setup 0.2 [get_clock mainclk] 这句的意思是我们在综合的时候,预想这部分的module经过时钟树综合之后,clock会比其它clock晚0.2ns。或者就是人为希望这条path的时序上留多0.2ns的裕量,怎么理解都可以。这样设置之后的结果: Image (这个地方在有多时钟域的design的用法是 set_clock_uncerta...
Here,Rrefers to rising edge,Frefers to falling edge,Drefers to data etch delay,Crefers to clock etch delay,DSrefers to delay skews from the timing model for the driving device,setuprefers to setup constraints from the timing model for the receiving device,holdrefers to hold constraints from ...
WE (write enable) rising edge. By probing the CE and WE signals with a high-speedoscilloscope, you observe their timing relationship. After ten single-shot acquisitions, you measure times between 87-92ns, all comfortably above the minimum setup time of 75ns. But what is the appropriate ...
Example for data launched at both the rising and falling edge of the clock - 8/80/Data_ddr.png Setup/hold and slack Setup time describes the time the signal has to be stable before the latch edge and hold time describes the time the signal has to be stable after the hold edge. Slack...
unatetiming arc is one where a rising transition on an input causes the output to have a falling transition (or not to change) and a fall-ing transition on an input causes the output to have a rising transition (ornot to change).For example, the timing arcs for nand and nor type ...
In synchronizing two digitizers, a low-phase noise signal is fed into each digitizer with equal length line cables. The skew can be measured in software, and the sample clock of one digitizer can be adjusted relative to the other to minimize the skew. The same methods are used in synchroni...
RTL得到了en与endpoint overflow_reg之间是存在时序关系的,但是由于并没有对应的时序约束,所以这条timing path是unconstrained.因此,解决方案是手动添加输入port en与clock 之间的时序约束关系,使用set_input_delay对en的setup和hold time进行时序约束;可参照以下命令: set_input_delay -clock clk -max 0.5 [get_...
(rising edge-triggered flip-flop clocked by dclk) Path Group: (none) Path Type: max Point Incr Path --- input external delay 3.00 3.00 f i_data_src[1] (in) 0.00 3.00 f U10/B (MX2X1) 0.00 3.00 f U10/Y (MX2X1) 0.39 3.39 f r_data_dst_reg[1]/D...