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		Dragon VERSION Description

		Current VERSION:	3.01
		Date:			Oct. 2003
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1.0	Apr. 2000
	- The first version. Solaris only.
	- Support TimberWolf and YAL format
	- Use script file to control the placement flow

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1.1	Feb. 2001
	- No script file. Stand alone.
	- Support GSRC bookshelf format

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1.11	Aug. 2001
	- Support arbitrary number of rows 
	- Support different row space (0 to standard cell height)
	- "-dis" option to create a display file

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1.12	Oct. 2001
	- Bookshelf .pl file: lower-left corner coordinates
	- Bookshelf .pl file: coordinates resolution

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1.13	Oct. 2001
	- Bookshelf .pl file: row starts from SubrowOrigin instead of 0
	- Bugs cleaned in simulated annealing.

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2.0	Nov. 2001
	- Add congestion reduction as a post-processing step

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2.01	Nov. 2001
	- Bookshelf .scl file: first row starts from arbitrary position

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2.02	Nov. 2001
	- Bookshelf .scl file: can handle irregular row width
	                       can handle irregular row spacing
	- Compatible to the following benchmarks
	  IBM-PLACE http://www.cs.ucla.edu/~xjyang/Dragon/ibm-place.html
	  MCNC http://vlsicad.cs.binghamton.edu/benchgsrc.html
	  CMU http://www.ece.cmu.edu/~herman/html/benchmark_slot.html
		(CMUDSP_1.0, IDEA2_1.0)

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2.03	Nov. 2001
	- Bookshelf .pl file: output an informative .pl file
	- An enhanced fast mode (-fast option)

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2.10	Mar. 2002
	- Can handle fixed-die placement (option "-fd")
 	- Congestion-driven white space allocation (option "-fd")
	- Support LEF/DEF format (IBM-PLACE 2.0 benchmarks)

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2.20	Apr. 2002
	- Detailed dragon added (option "-dp")

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2.21	Jun. 2002
	- "-pn" option added to output individual net information

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2.22	Oct. 2002
	- Bug fixed for white space allocation (unreasonable white space at the corner)

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2.23	Oct. 2002
	- Bug fixed on IBM-bookshelf benchmarks (ibm07 etc)

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3.0	Nov. 2002
	- Timing-driven mode added

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3.01	Oct. 2003
	- Bug fixed in fixed die mode (when the congestion of an entire row is 0)