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- From: Dan Johnson <danj@aue.com>
- Subject: Magic/dlmV3.0 Announcement
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- Organization: Advanced Microelectronics
- Date: Wed, 6 Jan 1993 03:55:37 GMT
- Message-ID: <1993Jan6.035537.9027@sol.ctr.columbia.edu>
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-
- ********************************************************************************
- MAGIC/dlmV3.0 Advisory - CIF related BUG reports 12/21/92
- ********************************************************************************
-
- AuE has developed a new version of Magic that resolves several problems found in
- previous MAGIC releases. Most of the problems involve CIF processing and the MAGIC
- technology files. The bug list below summarizes some of the problems that we have
- encountered. To fix these problems we have implemented changes in the MAGIC source
- code and various Magic technology files. If you are using the AuE I/O pad library
- please make sure that you are using the AuE technology file and the AuE version of
- Magic to process your layout databases. If you are using previous versions of MAGIC
- and the MOSIS technology files you may encounter design rule violations that are
- produced when databases are processed through multiple CIF read/write conversions.
- You can obtain the new version of Magic and the dlmV3.0 cell family via E-mail.
- Send your cell family request to cells@aue.com and your Magic request to
- magic@aue.com.
-
- [1] PROBLEM - If the lambda=0.5(gen) CIF ostyle is used to generate CIF for
- the AuE IO cells, the M1 to M2 vias will not be generated from the "pad" log
- and the bond pads will be floating. It does not matter that MOSIS will place
- metal3 and via2 on the layouts before fabrication, the metal2 will still not
- be connected to metal1!
-
- DETAILS - AuE used the MAGIC log "pad" as the bond pad in the 0.8um IO library.
- Normally this log generates metal2, via, metal1, glass cut, and XP layers during
- CIF out. The CIF output style in the initial release of 0.8u MOSIS technology
- file DID NOT do this. The log "pad" only generates metal2 and metal1.
-
- SOLUTION - AuE has obtained the latest technology file for the 0.8u design rules
- and will E-mail an updated MAGIC technology file to all registered users of the
- cell family. DO NOT FABRICATE 0.8u DESIGNS USING THE CURRENT TECH FILE!....
-
- [2] Problem - Via related design rule violations are produced in layouts that
- are processed through multiple CIF read/write conversions.
-
- Solution - The problem is caused by the CIF reader when it attempts to merge
- vias into via logs. The merge is unnecessary except for aesthetic reasons.
- In the AuE technology file the merge step has been removed. Via logs are now
- always seen as 4x4 rectangles on a metal1 and metal2 plane. The CIF reader
- can process these planes without affecting the via shapes and locations.
-
- [3] Problem - The AuE I/O pads contain ESD structures that can produce design rule
- errors and rail to rail shorts through the diffusion and well layers. The design
- rule problems occur when layouts are processed through multiple CIF write/read
- conversions. The MOSIS I/O pads also experience similiar problems. The errors
- are produced by diffusion and well bloating that takes place during the CIF
- conversion process.
-
- Solution - AuE has defined new logs called "ndop" and "pdop" that are used to
- implement the ESD structures. Using these logs, well edges can straddle
- diffusion junctions to create structures that prevent diffusion junction
- spiking during an ESD event. The "ndop" and "pdop" logs generate active and
- select masks but not well regions. When reading CIF back in, boolean operations
- are performed on the n-select and p-select masks to generate the nnd, ndiff,
- ppd, and pdiff logs. The "ndop" and "pdop" regions are added to the database
- automatically.
-
- GENERAL NOTE: MOSIS has recently updated several technology files. If you are
- using the MOSIS service you should make sure that you obtain the
- updated documentation.
-
-
- If you have any additional questions please contact Advanced Microelectronics via
- E-mail using cells@aue.com. For those without E-mail access information requests
- can be directed to:
-
- Advanced Microelectronics
- P.O. Box 55729
- Jackson. MS 39296-5729
- (601) 932-7620
-