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AR# 1224

ORCAD - Reading an Orcad 386+ design into Orcad Capture 7.0 for Windows


Keywords: Orcad, Capture, 386+, Windows, read, reading

Urgency: Standard

General Description:
Often an engineer will need to read an OrCAD SDT 386+ design into capture for Windows.
This usually happens if an existing SDT 386+ design must be updated, or if the engineer
receives the SDT 386+ design from a colleague.

What files does Capture require for proper translation?



1. Net attributes: net flag symbols
In SDT-based Xilinx designs, special critical nets were declared using library symbols:
C (critical), N (non-critical), and L (long line) components wired to the appropriate nets.
Replace C, N, or L components with net properties on the appropriate schematic wire.

2. Groups and timing specifications: TIMEGRP and TIMESPEC pipe-text:
In SDT-based Xilinx designs, library symbols were grouped and associated through SDT
part fields and TIMEGRP pipe-text, and timing specifications through TIMESPEC pipe-text.
Replace pipe-text with the new TIMEGRP or TIMESPEC symbols available from the
appropriate XC<family>.OLB schematic library.

3. Part targets: PARTTYPE pipe-text
In SDT-based Xilinx designs, pipe-text was used to target the schematic work sheet to a
specific Xilinx component. Capture does not facilitate this function; however, you may choose
a specific target architecture and package for a project created by the XACTstep Design

See the "Getting Started" chapter in the Xilinx Design Manager Flow Engine, Reference/User
Guide for more detail.

4. Global attributes: GLOBAL pipe-text
In SDT-based Xilinx EPLD designs, pipe-text was used to specify compiler and fitter optimization
controls. Capture does not facilitate this function; however, you may establish global attributes for
a project created by the XACTstep Design Manager.

See the "Implementation Options" chapter in the Xilinx Design Manager Flow Engine, Reference/
User Guide for more detail.


SDT 386+ stores designs as schematic files(.sch) and library files(.lib). Also, a configuration
file named SDT.CFG contains necessary information, such as what SDT 386+ libraries are
required by the schematics.

Place the schematics, user libraries, and SDT.CFG into a directory. You may need to adjust
the SDT.CFG information, such as PLIB=... so that the paths are correct. You can edit
SDT.CFG in a text editor, such as Notepad.

- From Capture, select File->Open->design
- Change file type to "SDT Schematic" (*.sch)
- Select the top-level schematic from your design directory

Capture will create a new file with a .dsn extension that contains all of the design information.
AR# 1224
Date Created 09/10/1996
Last Updated 04/09/2001
Status Archive
Type General Article