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Clearance Check Setup
Applies to
Layout Editor
The dialog box presented below allows setting the clearance values for the various parameters for a layout.
The dialog may be invoked from the menu
Auto | Autocheck.
Given below is a brief description of the parameters provided in the above window.
Pad to Pad distance
Allows specifying the distance between the pads in the text box provided. The minimum value is
.008".
This option must be checked in order to include in the Autocheck process.
Pad to Trace distance
Allows specifying the distance between the pad and the trace in the text box provided. The minimum value is
.008"
. This option must be checked in order to include in the Autocheck process.
Trace to Trace distance
Allows specifying the distance between the traces in the text box provided. The minimum value is
.008".
This option must be checked in order to include in the Autocheck process.
Channel width for single trace check
Allows specifying the tolerance on either side of the trace in the text box provided. The minimum value is
.050"
. For e.g. if the channel width is .50" then, .25" tolerance will be considered on either side of the trace while performing the check.
Check Layers frame
Allows toggling
ON/OFF
the layers on which the check is to be performed. To change the selection, enable/ disable the checkbox against the specific layer name.
Clearance violations are marked on the graphic
screen by ← #violation type code
, To get full violation description hover cursor over the marker:
Errors if any , are reported in another dialog box given below.
Error to correct may be selected by pointing corresponding marker on the screen. The user may select any of conflicting traces and order its automatic rerouting by clicking on Redraw button .
Check other DR violations
Applies to
Layout Editor
The dialog box presented below allows setting the values for various other design rule parameters for a layout. The dialog may be invoked from the menu Auto | Autocheck.
Select
Other DR Violations
tab .
The parameters defined in this window works in conjunction with the values set in
DEFAULT DESIGN RULES
window. Once the parameters is set for the design externally using
DEFAULT DESIGN RULES
window, necessary options shall be set in
CHECK OTHER DR VIOLATIONS
window and the program will output errors accordingly.
The various options that may be set in the window are: -
Routing layers and Direction
Trace on Wrong layer
: Checks if the trace is on the wrong layer. For eg: If in
DEFAULT DESIGN RULE
window, the Design rule for Component layer is Not used and in the design if the routing is routed in component layer, after performing autocheck, system prompts errors.
Traces routed in Wrong direction:
Checks if the trace is on the wrong direction either horizontal or Vertical. For eg: If in
DEFAULT DESIGN RULE
window, the Design rule for Component layer is Horizontal and in the design if the routing is routed Horizontally, after performing autocheck, system prompts errors.
Via rules
Wrong via hole padstack:
Checks if routing uses wrong via hole padstack than specified.
Layer change through Via hole:
Checks if routing uses Via hole.
Too many vias on Pin to Pin connection:
Checks if too many vias are used for a pin to pin connection.
Trace rules
Trace with width greater than maximum allowed:
Reports error if the trace width is greater than maximum allowed.
Trace with width greater than minimum allowed:
Reports error if the trace width is greater than minimum allowed.
Trace segments longer than maximum allowed:
Reports error if the trace segments longer than maximum allowed.
Traces longer than maximum allowed:
Reports error if the traces is longer than maximum allowed.
Trace with airgap greater than minimum allowed:
Reports error if the trace airgap is greater than minimum allowed
Trace with airgap lesser than maximum allowed:
Reports error if the trace airgap is greater than maximum allowed
These errors are reported in another dialog box given below
In this dialog, on right click on the error (right hand side) displays the cause of the error. This may be rectified by invoking the Default Design rule from this window and
CHECK THE NETS AGAIN.
The selected or the entire nets listed may be corrected and checked as shown in the figure below.
The selected nets in the dialog gets highlighted on the workspace and a live interaction between the editor and this dialog window can be carried out.
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