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CS 258F Class Project Spring 2003

CS 258F Class Project Spring 2003. Prof. Jason Cong. Project Description. Input Netlist given in bookshelf format Global placement for the netlist with overlaps Output An overlap free detailed placement with wirelength optimized Constraint Cells should be put on the standard cell rows. ?.

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CS 258F Class Project Spring 2003

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  1. CS 258F Class ProjectSpring 2003 Prof. Jason Cong

  2. Project Description • Input • Netlist given in bookshelf format • Global placement for the netlist with overlaps • Output • An overlap free detailed placement with wirelength optimized • Constraint • Cells should be put on the standard cell rows

  3. ? Global Placement The global placement solutions are derived by snapping detailed Placement results into pre-defined bins

  4. Bookshelf Format • .aux • List of the component file names of the problem instance • .nodes • Describe the dimension of each cell • .net • Description of each net, i.e. the pins it connects and their relative locations on each node • .pl • Describes the location and orientation of each cell. It gives the global placement information • .wts • Describes the weights associated with each net • .scl • Describes the layout of standard cell rows

  5. 32 n1 32 C1 C3 n2 32 C2 Bookshelf Example • .nodes • C1 32 32 • C2 64 32 • C3 32 32 • .pl • C1 200 200 : N • C2 232 200 : N • C3 296 200 : N • .nets • NetDegree : 3 • C1 I : 16 16 • C2 O : 32 16 • C3 O : 16 16 • NetDegree : 2 • C2 I : 16 16 • C3 I : 32 16 64

  6. Bookshelf Example • CoreRow Horizontal • Coordinate : 32 • Height : 32 • Sitespacing : 32 • SubrowOrigin : 32 NumSites : 100 3200 32 32 32 http://vlsicad.ucsd.edu/GSRC/bookshelf/Slots/Placement/plFormats.html

  7. Parser Description • Class Pin • x, y : relative location to the LL corner of each cell • cellPtr : pointer to the owner cell • netPtr : pointer to the owner net • dir : direction of each pin • Class Net • id, name : identifier • pinList : vector of pins it connects • Class Cell • id, name : identifier • wth, hgt : dimension of the cell • x, y : LL corner of the cell • pad : True if the cell is a pad, False if the cell is movable • pinList : vector of pins on the cell • Class SingleRow • lowerLeftX, lowerLeftY : starting position of a row • width, height : height is the height of standard cell Location: /u/class/u/class/cs258f/2003_spring/parser

  8. Circuit Description • Pekoxx circuits • Uniform sized cells • Known optimal wirelength • Initial detailed placement by optimal solution • Ibmxx circuits • Non-uniform sized cells • Optimal wirelength unknown • Initial detailed placement by Dragon http://ballade.cs.ucla.edu/~pubbench/placement/ http://www.cs.ucla.edu/~xjyang/Dragon/ibm-place.html

  9. The End

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