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This archive contains VPR, an FPGA placement and routing tool, and T-VPack, a program to pack LUTs and flip flops into coarser grained logic blocks and convert a netlist from blif format to VPR's .net format. There is a detailed manual covering everything from how to compile the programs to how to use them in manual_430.ps (and manual_430.pdf if you prefer .pdf format).

To see VPR in action on the (small) sample circuit (e64 from the MCNC benchmark suite) and the sample FPGA architecture files type:

cd vpr (if not already there) vpr e64-4x4lut.net 4x4lut_sanitized.arch e64.p e64.r -route_chan_width 40 -inner_num 3

(Add -nodisp to the command line above if you're not running on an X-Windows graphics capable computer.)

The logic block for this architecture contains 4, 4-input look-up tables and 4 flip flops along with local routing (a cluster-based logic block of size 4). The routing wire segments all span 4 logic blocks in this architecture.

I've also included a simpler architecture in which a logic block is only a 4 LUT plus a flip flop, and in which all routing wires span only one logic block. To run this case, try:

cd vpr (if not already there) vpr e64-4lut.net 4lut_sanitized.arch e64.p e64.r -route_chan_width 10 -inner_num 3

The two netlists (e64-4x4lut.net and e64-4lut.net) were created using T-VPack on a technology-mapped netlist in .blif format, with the appropriate options in each case:

cd t-vpack (if not already there) t-vpack e64.blif e64-4x4lut.net -cluster_size 4 -inputs_per_cluster 10

and

cd t-vpack (if not already there) t-vpack e64.blif e64-4lut.net -no_clustering

There are a lot of different ways to use VPR and T-VPack -- see manual_430.ps or manual_430.pdf for details.

-- Vaughn Betz, March 25, 2000

============================================================================== Contents of the archive:

README_430.txt: This file. manual_430.ps: Postscript manual of VPR and T-VPack. manual_430.pdf: PDF version of the manual.

./vpr

*.c, *.h: Source code for VPR.

makefile: Makefile for VPR. Currently set for Solaris and gcc; you may have to modify the library paths and compiler options on your machine.

descript.txt: A revision history of VPR.

e64-4x4lut.net: A sample netlist file from the MCNC bencmark set. The logic block contains 4 4-input LUTs and 4 FFs.

e64-4lut.net: A sample netlist file from the MCNC benchmark set. The logic block contains 1 4-LUT and 1 FF.

4x4lut_sanitized.arch: A sample FPGA architecture file, with a logic block containing 4 4-input LUTs and 4 FFs.

4lut_sanitized.arch: A sample FPGA architecture file, with a logic block containing 1 4-LUT and 1 FF.

./vpack

*.c, *.h: Source code for T-VPack.

makefile: Makefile for T-VPack. May have to be modified for non Solaris machines or for compilers other than gcc.

descript.txt: Revision history of VPack / T-VPack.

e64.blif: MCNC benchmark circuit e64 technology-mapped by Flowmap to 4-input LUTs. This is a combinational circuit.

s1423.blif: A sequential MCNC benchmark circuit. It has been technology- mapped to 4-input LUTs and flip flops by Flowmap.

==============================================================================

Major changes from VPR Version 4.22 to this Version (4.30), and from VPack Version 2.09 to T-VPack Version 4.30 are:

1. VPack has been made timing-driven, and it's name has been changed to T-VPack. It can still be run in the old, non-timing driven mode (specify -timing_driven off), but the timing-driven algorithm gets better timing and routability than the old algorithm. The timing-driven packing algorithm is used by default. Sandy Marquardt wrote the new, timing-driven algorithm in T-VPack.

2. The VPR placer algorithm has been made timing-driven, again by Sandy Marquardt. The timing-driven mode is the default. Running the placer in timing-driven mode speeds up the typical circuit by about 25% while only costing about 5% more routing.