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LOGIC.DOC
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1993-02-12
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PADS-LOGIC Version 3.0 ADVISORIES
PART TYPES
When changing a part type to a different part type, The reference
designation will not be affected. For example, if a resistor part type
were changed to an I.C. part type (an R1/4W for a 7404), the reference
designation would remain as it was assigned to the R1/4W part type. In
this example, the user must manually update the reference designation
after the part type has been changed.
NETLIST
When a user specifies a Reports, Netlist out, using PADS-PCB, the user
should note that the PCB decal defined in this ASCII file identifies a
specific decal which appears in his/her PCB database. This new version is
enhanced to allow all the alternates to be available in Pads-Pcb providing
the alternate decal being called out is one of the alternates presently
defined in the part type used to bring the part in. If the decal is
completely independent of the part type being used, then only that specific
decal will be available in the board design.
REPLACE PART
Attempting to replace a part in a schematic which has less pins than the
original part results in the prompt: "NEW PART HAS LESS PINS THAN ORIGINAL
PART", and the part will not be replaced. This is an error checking
function that is performing correctly. You cannot change a part with fewer
pins because connections would be lost. Always replace with a part
containing the same number of pins or more pins. If not possible, the
original part must be deleted and the new part (with fewer pins) put in and
reconnected.
DUPLICATE PIN NAMES
Unable to have duplicate pin names in LOGIC decal! Names such as NC or N/C
must be different, ie: NC1, NC2, etc.. This is functioning correctly and
will not be changed. If desired, add the names as free text in the Mod Gate
routine.
REFERENCE DESIGNATORS
Pure alpha reference designator names are not supported.
BUS NAMES
Bus names with alphanumeric characters are not supported, ie: DA1[00:13],
only names such as DA[00:13]
DISK SPACE
Please be advised that on systems with low amounts of hard disk space, a
message appears indicating your disk space is low, and the backup files
cannot be created without clearing up more disk space. If the message goes
unheeded, the system in some cases will attempt to try backing up the
schematics and get caught in a never ending loop. A reboot of the system is
the only way out of the software.
CAE DECAL GENERATION
Many users are modifying existing parttypes to make other parts. While
this is a valid procedure, please be aware that if you make changes to a
gate decal at this level (physical changes rather than text modifications),
any other parttype that utilizes this gate decal in its configuration, will
also assume these physical changes. The correct way to implement these
changes is:
1) To use an existing gate decal as a base for generating another, call
up gate "A" under the "GATE DECAL" command in the library menus,
produce all the modifications necessary at this point, and save it
away as gate"B". This way gate "A" is preserved in its original form
and gate"B" has now been created.
2) To generate a new gate decal at the parttype stage, you simply define
the name in the electrical section. When you complete (F9) the
parttype, the system alerts you that your gate decal does not
exist. At this time, select "MOD GATE" and generate your gate decal.
Once you have finished defining the gate, select complete (F9), and
save the part away in the normal fashion.
OFFPAGE
If a schematic is brought to another design station and a GROUP/CUT is
performed which contained offpage symbols, when that cut is re-added to a
new sheet, the offpage symbol may be added using the wrong symbol. This is
caused by the differences between the offpage parts which can vary from
system to system. We recommend modifying the offpage part on system two to
match that of system one, then paste the group back in.
HARDWARE NOTES
This version is 32-bit only and is not compatible with 80286 or XT computers.
FOR PADS-PCB USERS
If you plan to use the PADS-LOGIC 32-bit option with PADS-PCB, take care
not to exceed the limits of PADS-PCB. The 16-bit option of PADS-LOGIC will
not allow you to create a schematic that exceeds the maximum design size of
PADS-PCB.
NET NAMES
PADS-LOGIC 32-bit supports 47 character net names. PADS-PCB only supports
12 character net names. Problems may occur if you are using PADS-PCB and
exceed the 12 character limitation. PADS-2000 v3.x does support 47 character
net names.
BUS NAMES
PADS-LOGIC 32-bit supports BUS NAMES up to 44 characters.
SIGNAL PINS
Do not exceed more than 20 characters in the EDIT SIGPIN routine, problems
may result.
PRINTING REPORTS
To directly print out report files to your printer, type PRN <CR>.
If, after reviewing this document and consulting your PADS-LOGIC manual,
you would like additional information, then contact our Technical Support
Staff at (508) 486-3328 or 1-800-423-PADS.
7/92
***** END OF LOGIC.DOC FILE *****