·最大电容(maxcapacitance)的约束,例如对于下面的电路: 对应的最大的电容约束如下: 【1】set DRIVEPIN TECHLIB/invla27/Y 【2】set MAXCAP [getattribute $DRIVEPIN maxcapacitance] 【3】set CONSERVATIVE_ MAXCAP [expr $MAXCAP / 2.0] 【4】set_ max_ capacitance $CONSERVATIVE_ MAXCAP [getports IN1...
set_max_capacitance:set_max_capacitance 0.5 [all_outputs]:限制一个driver的output pin驱动的最大电容,电容包括它驱动的所有load pin上的cap和互连线上的电容。实际上,转换时间本质上取决于输出负载的大小(所以要优先修复capacitance),电容越大,转换时间越大(信号上升下降时间越长)。 set_max_transition: set_...
比如以下这种情况: 上图所示的电路中第一级buffer驱动了fanout为3的buffer tree(这里只画了fanout=3,一般情况下远远不止),这段net因为fanout较多有可能会有max transition,max capacitance甚至max fanout的DRC违例。但是起点寄存器到终点寄存器之间都只有2级buffer,timing情况还比较乐观,不太容易出现timing violation。在...
maxtransition,maxcapacitance甚至maxfanout的DRC违例。但是起点寄存 器到终点寄存器之间都只有2级buffer,timing情况还比较乐观,不太容易出 现timingviolation。在默认情况下,DC为了避免DRC问题,不会将电路优 化成这种样子,更有可能是以下的电路: 这段电路从功能上与上一图中电路是一致的,在优化过程中为了避免 DRC违例,...
理想网络是由cell、net和pin组成的网络。这些cell、net和pin称为理想网络的源对象(Source Object)。理想网络中的cell、net和pin不会进行时序更新、时序优化和DRC fixing,max_capacitance、max_fanout和max_transition等设计规则将直接被忽略。通过将一些设计对象加入理想网络可以减少仿真时间,提高优化质量。
Set capacitance on output ports and output pins Syntax set_load [‑rise] [‑fall] [‑max] [‑min] [‑quiet] [‑verbose] <capacitance> <objects> Usage Name Description [-rise] Specify the rise capacitance value (for ports only) [-fall] Spe
Capacitance 40mvqr Structure Fixed Capacitor Manufacturing Material Polypropylene Usage High Frequency Coupling, High Frequency Bypass Transport Package Carton with Wooden Specification 15KV/27KV/38KV/69KV/132KV, 50HZ/60HZ, Trademark HEMG Origin China Production Capacit...
Capacitance per stage: 300pF Square wave response: Partial response time is less than 100ns, overshoot is less than 20% Voltage division uncertainty: Less than 1% 4. Chopping device (for option) Rated Voltage: 300kV Sphere gap type: Ф300mm Time delay mode: 2-6µs time delay...
The important thing to note here is that this can help with limiting the maximum (worst-case) power seen by the device, which can be helpful when having to work within the confines of a certain hardware limitation (power supply, limited decoupling capacitance to DDR supplies on the board, ...
5) Test mode:touch screen and external mouse operation, there is automatic and semi-automatic, manual three operating status. With pressor, tuning (including manual, automatic), subsection pressurized and timing, running status, pattern switching, troubleshooting tips, capacitance inductance frequency swa...