Knocking Out Openings in Our Mask
There are several places in our array of RDL circuits where we have to open up the mask so that underlying identification and alignment targets are visible. Normally the mask designer gets a list of window locations and sizes. HExtract can automate this process also to avoid hand editing.
We have a total of 6 openings to create:
NAME LLX LLY URX URY WAFER_ID 3100.000, 92520.000, 16750.000, 95650.000 FID1 -9870.000, 94060.000, -7700.000, 95670.000 FID2 7700.000, -95670.000, 9870.000, -94060.000 ALIGN1 -82695.390, 50150.000, -81195.390, 51650.000 ALIGN2 -82695.390, -51650.000, -81195.390, -50150.000 ALIGN3 81195.390, 50150.000, 82695.390, 51650.000
Again we will have HEXtract clip them smoothly so that the RDL and UBM layer do not suffer to much metal density variations.
HEXtract Command Line Syntax
We'll create a simple batch file that calls HEXtract 5 times -- once for each layer. However because there are so many cutouts, we will use an include file to list the cutouts.
Here is the contents of the include file, cutouts.txt
# MASK CUTOUTS # LLX LLY URX URY # WAFER_ID 3100.000, 92520.000, 16750.000, 95650.000 # FID1 -10320.000, 93410.000, -8150.000, 95020.000 # FID2 8150.000, -95020.000, 10320.000, -93410.000 # ALIGN1 -82695.390, 50150.000, -81195.390, 51650.000 # ALIGN2 -82695.390, -51650.000, -81195.390, -50150.000 # ALIGN3 81195.390, 50150.000, 82695.390, 51650.000
Here is an annotated command line for one mask
c:\wcad\hextract\hxtractor32.exe <- launches the hextract program via1_after_clip.gds <- the input file via1_bf_targets.gds <- the output file -layers:1 <- only process layer 1 (ourVIA1) -complement <- forces the cutout option -email@example.com <- gets cutout list from file ...
We'll repeat the same command line changing the file names and layers each time. The only difference will be on the solder mask layer. For that layer we will use the additional option -drop_partial_poly.
hxtractor32.exe via1_after_clip.gds via1_bf_targets.gds -layers:1 -complement -firstname.lastname@example.org hxtractor32.exe rdl_after_clip.gds rdl_bf_targets.gds -layers:2 -complement -email@example.com hxtractor32.exe via2_after_clip.gds via2_bf_targets.gds -layers:3 -complement -firstname.lastname@example.org hxtractor32.exe ubm_after_clip.gds ubm_bf_targets.gds -layers:4 -complement -email@example.com hxtractor32.exe solder_after_clip.gds solder_bf_targets.gds -layers:5 -complement -firstname.lastname@example.org -drop_partial_poly
Here is what the RDL layer looks like after knockouts generated by HExtract:
top section of wafer ...
zoomed in ...
zoomed in again ...
If you'd like to examine the GDSII files after the
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