Save power Scale down power rail Ensure Reliability Issues with variation Issues with timing ...
-
Upload
georgia-griffith -
Category
Documents
-
view
212 -
download
0
Transcript of Save power Scale down power rail Ensure Reliability Issues with variation Issues with timing ...
Save power Scale down power rail
Ensure Reliability Issues with variation Issues with timing
Identify and Replace Use custom cell Use different cell from library
TOOL FLOW FUNCTION
Uses Perl to open path and write celllist.lst
Skill and Perl work together to generate schematic with all cells
Start Cadence and collect info with log file
TOOL FLOW FUNCTION
Skill Creates secondary library of cells for testing
Big ocean created with Perl which contains test information for each cell
Ocean runs and creates individual results
Perl script checks outputs
The figure below displays a typical testing setup for a cell from the ST 120 library.Another thought to keep in mind is the timing of the waveforms of the inputs.
Want a process TT (typical N&P) to sit on the balanced process line
These effects are amplified due to the exponential dependence on current in sub-threshold
SF corner is a worst case scenario in P-Strong(left box)
FS corner is the worst case scenario in N-Strong(right box)
ST MICRO 90 (715 CELLS)
Includes D FF’s & D latches
Tested at Tmin = 2 uSec
Vdd FF TT SS FS SF .35 20 20 18 15 24 .3 17 21 21 15 35.25 20 20 20 15 49 .2 22 19 21 13 57
ST MICRO 120 (698 CELLS)
Includes D FF’s & D latches
Tested at Tmin = 2 uSec
Vdd FF TT SS FS SF .35 22 25 29 10 35 .3 25 25 28 8 41 .25 25 27 27 8 41 .2 25 29 29 8 41
ST MICRO 90 (715 CELLS)
Not Including D FF’s & D latches
Tested at Tmin = 2 uSec
Vdd FF TT SS FS SF .35 4 4 4 4 5.3 4 4 4 4 5.25 4 4 4 4 5.2 4 4 4 4 5
ST MICRO 120 (698 CELLS)
Not Including D FF’s & D latches
Tested at Tmin = 2 uSec
Vdd FF TT SS FS SF .35 5 5 5 5 5 .3 5 5 5 5 5 .25 5 5 5 5 5.2 5 5 13 8 5