pks help in adding power stripes

hi friends
i set floorplan for my design as follow
cluster (chip )size
Top - bottom (0 -58)
left - right (0-57)
i/o - core
spacing for all t,b,l,r is 4

how i set power stripes for metal layer in Umc18 lef library
for met6 spacing is 0.60 and width is 0.44(i read from lef library).
please help what data i have to set in
stripe width =?
number of stripes =?
net names =?
start from distance =?
stop from distance =?
stripe spacing =?
net spacing =?

and i also wanna know in what way i can set the number of power
stripes.
thanks
regards
aravind

 

set_power_stripe_spec documentation is pretty clear but I hope I can
help you with some suggestions. The number of stripes and the width of
stripes are determined by how much power your block requires. A rough
rule of thumb is to use 1 micron per mA of power you need. To decide
the power you can use an estimate based on how many nand2 equivalent
cells you have, what frequency you're running at etc. The standard
cell library docs should have some method of estimating power
consumption of individual cells.
The net names should be the same as that you get from the cell
libraries LEF file. Use the same net names which appear in the macro
lef. Each cell should have a power and ground pin (usually VDD and
VSS).

 

thanks mk,
but i didnt get your point, 1u/mA means, ur telling about width of
power stripes or number of power stripes, pls tell with an example then
only i can understand. i m not so brillant to understand immediately.

is it any way/command to find number of nand equalivence in my design.
pls explain with an examples
thanks

 

The product of the two. In other words, estimate the total power
requirement and bring in enough metal to carry the current. This tells
you the total width of all stripes. You also have to consider that the
row VDD,VSS connections have some IR drop so you have to distribute
this total metal more or less evenly across the macro so put one
VDD,VSS stripe per 150~200U. So if you need 100 mA, use total of 100U
of VDD and VSS and distribute it into 20~30U stripes of say 5 micron
apart.

"report_area -hi -cells" in PKS. Find the area of nand2(x1) and
divide the total size to that number.

hope this helps.