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Re: setup and hold
Hi mujtaba ...
as u see set is the min time required by the data tobe stable before the clock transition and so the worst case would be only if you consider the max operating conditions for your std cells ....i.e., the PVT conditions as SS 1.98V (max) 125°C
so u use the...
Re: Antenna Effect
The reason why we jog to upper metal layers only, is because the nets remain floating and thus preventing the transistor gates from desturction,The alternate technique is reverse biased diodes.
Added after 2 minutes:
* reamin floating during the process of metallisation...
clock convergence pessimism removal
arey mujtaba kaisa hai
hey CRPR is Clock Re-convergence Pessimism removal, its computing delay adjustments on the clk network ,as the name says its the removal of pessimism for the clock path .
when you set the timing analysis for BC- WC mode , the same...
Re: cmos inverter
Gate leakage is also comparable to sub threshold leakage in the DSM and VDSM.
as the thickness of the gate oxide is reduced to few atomic layers tunneling effect is increasing and the gate leakage has become quite an issue.
The thickness of gate oxide is restricted to 8 °A (...
Re: four corner sta
I beleive that the four corners of the STA would other wise be
1.BC- WC ( best case - worst case)
2. OCV ( on chip variation, by introducing Time derating)
3.CRPR ( Clock Reconvergence Pessimism Removal)
4. Single mode or Multimode timing analysis.
:idea::|
Tmax > Tpd + Tlogic +Tsu- Skew(if positive skew)+2 X JITTER
Jitter is the temporal variation in the clock signal, and effects the Pulse width unlike the skew,Jitter needs to be consider to calculate the Tmax for worst case of Jitter where first clock pulse had its pulse width greater and the...
Re: Flip-Chip
flip chip technique avoids the traditional wirebonding machines , in which the connectivitity through gold wires is done in the sewing machine order, i.e., serially.Hence it is a time consuming technique also for the designs with high pin count it may take quite long and much...
why filler cells asic
:D
Filler cells are used to establish the continuity of the N- well and the implant layers
on the standard cell rows, This is one of the Fab constraints, for ease in the generation of the masks.
D-cap cells are quite different from the filler cells , while these can as...
Re: clock-skew
:arrow:
CTS : is the process where we try to minimise the skew in the design.
the clock skew can be minimised by the Post CTS optimization done by the tool, it resizes the clock buffers and the net lengths and balances the clock tree, most of these tools follow an algorithm...
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