MSIM Simulator with 5X~10X Speedup for Characterizing CCS Timing Model of Cell Library
SANTA CLARA, Calif. -- May 21, 2008
-- Legend Design Technology, Inc. today announced that its MSIM, a
high-accuracy Spice circuit simulator, has been upgraded for efficient
characterization of CCS (Composite Current Source) model used in cell
library characterization in SoC designs. MSIM with ‘Advanced CCS
Control’ runs 5X~10X faster than most popular Spice simulators, when
characterizing CCS Timing Model under PrimeTime accuracy requirement.
MSIM provides the benefits of extreme accuracy, high speed, excellent
convergence, built-in RC reduction, and best price-performance.
To produce CCS model, the output current will be simulated for each
pair of input slew-rate and output load. Due to the inaccuracy from
Spice simulations, there will always be a difference between voltage
supply and the integral of current waveform divided by output load. If
that difference exceeds 5% of voltage supply, PrimeTime will issue a
warning for possible inaccuracy in full-chip static timing analysis.
To meet PrimeTime accuracy requirement, Spice simulation at fast input
slew-rate and small output load shall need much tighter tolerances for
simulation controls, which could increase the run time significantly.
However, for most slew-rates and loads in the table, it becomes
unnecessary to apply those tighter tolerances for corresponding
With extensive field experiences and R&D
efforts, we have successfully developed the solutions for the above
challenges and built the ‘Advanced CCS Control’ into MSIM simulator for
characterizing CCS models efficiently. MSIM with ‘Advanced CCS Control’
can automatically optimize the simulation tolerances and time-step
controls for various input slew-rates and output loads.
our CCS model characterization of standard cell library, MSIM with
‘Advanced CCS Control’ has provided us an excellent balance between
accuracy and speed. MSIM will ensure the CCS modeling accuracy within
PrimeTime requirement,” said Kenny Tung, Corporate Library Lead,
Applied Micro Circuits Corporation.
MSIM circuit simulator
with ‘Advanced CCS Control’ is immediately available. At DAC 2008 in
Anaheim, California, Legend will be demonstrating MSIM, Turbo-MSIM,
CharFlo-Cell! and CharFlo-Memory! at Booth #1733.
Design Technology Inc. is a leading provider of circuit simulation and
semiconductor IP library characterization software for SoC designs.
With an emphasis on productivity and value, Legend’s library
characterization toolset, CharFlo-Memory! for memory IP and
CharFlo-Cell! for standard cell and IO library, revolutionize the
time-consuming and error-prone processes associated with
MSIM is Legend’s high-accuracy SPICE circuit
simulator with fast speed and great convergence. Turbo-MSIM is Legend’s
full-chip Fast-Spice simulator ideal for timing and power simulation,
and mixed-signal circuit verification. Both simulators are well
designed for nanometer technology and provide excellent price
performance. For more information, visit www.LegendDesign.com.
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