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Backward annotation with the
is always required after performing layout net list modifications such as part name changes, pin/gate swaps, or alternate part package type assignments. Part names can be changed using the
function from the menus for interactive part placement. Interactive pin/gate swaps are applied with the
function from the manual part placement menu. Automatic pin/gate swap is performed with the
,
and
autoplacement functions, and can also be performed when using the
option with the rip-up router of the
Autorouter module. Alternate package types can be assigned using the
submenu function during manual part placement. Note that any of the net list modifications mentioned above will get lost when re-editing the schematic without running the
.
3.3.1 Starting the Backannotation
is fully integrated to the
Schematic Editor and can be explicitely started using the
command from the
menu.
Automatic Backannotation Requests Processing
A feature for automatically processing pending
requests is integrated to the
Schematic Editor functions for loading schematic plans.
requests are generated when saving layouts with net list modifications such as pin/gate swaps or changed part names. Loading an SCM sheet with a pending
request automatically activates a verification menu which allows to backannotate the currently processed design. The
request is deleted after successfully running the
.
3.3.2 Running the Backannotation
Design and/or project file name and layout element name prompts are activated after calling
(pressing the ESC key aborts the
):
| Utilities |  |
| Backannotation | |
The design file name is the name of the project file to be selected for
. The design file must be available with extension
.ddb but this extension must not be included with the file name specification. If the user types an empty string (by pressing the return key
 ) to the design file name prompt, then the system will automatically use the file name of the currently loaded or the previously processed element (i.e., the global project name).
The layout element name is the name of the layout and/or the net list to be backannotated. If the user types in an empty string (by pressing the return key
) to the layout element name prompt, then the system uses the default layout element name defined with BAE setup (see also command
LAYDEFELEMENT of the
bsetup utility program).
After successfully processing the layout the
will generate a modified logical net list in the project file. For user information purposes
also creates an assignments file under the design file name with extension
.ass. The assignments file is an ASCII file containing an annotation report (part name changes, logical to physical pin mapping).
The system issues the
No errors occurred! message after successfully completing the
process, and the user can press any key to exit from the
function. Errors during
usually result from a wrong layout element name specification and/or from missing logical net list data. Missing SCM symbols and/or parts could also prevent the
from completing successfully. The
lists missing symbols/parts. These must be replaced on the SCM sheet(s) to allow for subsequent
processes to be completed successfully (the missing parts problem could also be "solved" by simply re-running the
Packager instead of the
, but all netlist-specific layout modifications scheduled for
such as pin/gate swaps would then be lost).
3.3.3 Example
This section describes how to run
on the
demo.ddb example project file which has been created in the previous chapter. You should change to the directory where the
demo.ddb file resides.
Start the
Schematic Editor through the BAE main menu and use the following commands to call
for transferring the physical net list named
board from the
demo.ddb design file back to the schematics:
| Utilities | |
| Backannotation | |
| Design File Name ? | demo |
| Layout Element Name ? | board |
displays the following messages:
==============================
BARTELS BACKANNOTATION UTILITY
==============================
Design File Name ........: 'demo'
Layout Element Name .....: 'board'
No error occurred!
The
No error occurred! message means that
was successfully completed and the logical net list in project file
demo.ddb has been annotated with the physical net list named
board.
produces an assignment file named
demo.ass which is not required by the BAE design system. You can use the part name changes report and the logical to physical pin mapping lists provided with this ASCII file for backannotating to foreign CAE systems.
annotates physical net list modifications such as part name changes and pin/gate swaps to the schematic sheets. You can check this by examining the SCM sheet elements after successfully running the
.
Backannotation • © 1985-2010 Oliver Bartels F+E • Updated: 30 October 2009, 16:33 [GMT]
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