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12 Threads found on Path Based Analysis
Assuming you are speaking of PBA, this option is for reporting. Usually the reports are generated on graph based analysis and the numbers are pessimistic as the worst case transitions/delays are assumed. In path based analysis, you trace the actual path and transitions resulting is accurate (...)
a liberty file provide the timing (also area, power...) of internal path of a cell/macro. for example the timing to go from a input A to output Q of a buffer is function of the input transition on seen on pin A, and the output load seen by the pin Q, then the tools based on the trans/load, used the lock-up table to know the propagation delay, rise
Hi, In Advanced OCV, How is Depth calculated in Graph based analysis and path based analysis?? How is Distance calculated in Graph based analysis and path based analysis?? Thanks, Ravi Shankar.
how i can put timing constraint to each path in design i am using DC_compiler , when i synthesize it gives me a slack zero all the time and in the timing report their is a notification that path is unconstrained
Hi, I was trying to look for some information on path based analysis but good explanations are few and far between. Does anyone know of any good videos or any websites where I can find more about this?
from Synopsys: Advanced on-chip variation (AOCV) analysis reduces unnecessary pessimism by taking the design methodology and fabrication process variation into account. AOCV determines derating factors based on metrics of path logic depth and the physical distance traversed by a particular path. A longer (...)
Hi all , I am bit confused with the AOCVM calculations done by PT all the synopsys documents , it is mentioned that graph based / path based aocvm derates will be applied starting from the common path in the clock path ( excluding the common clock cell).The common clock path will not be (...)
Hi, u know the time path model DC/PT will analyze is DFF'S CLOCK TO NEXT DFF'S DATA-IN. in order to analysis the I/O timing path , assign a true clock or virtual clock for the I/O port, make the I/O analysis based the model like the above(DFF->DFF) . Of course need use set_input_delay ,set_output_delay (...)
Hi, Can anyone explain answers for the following questions? 1. What is the difference between Total Negative Slack and Worst Negative Slack? 2. Does Synopsis DC do the static timing analysis based on the input slope and output cap info of cells present in the critical path of a design. If so, how does it calculate the timing of a (...)
I am looking for path based analysis in ASIC hardware. This analysis will be carried out during SI analysis.
hi muthamil, my 2 cents, Max operating frequency can be found by the Design Timing Critical path based on Timing analysis. Switching frequency for a cell is basically state driven and this information will be available in your library (state dependant power). happy designing chip design made easy
Hi, As i understand the whole concept of STA is to analyse all the timing paths with respect to one clock cycle(exception of multicycle path).Then how are latch based designs analysed? Also why is it suggested that the latches should be avoided as far as possible. Vicky

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