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/*===================================================================*/
//
// place_pads.c
//
// Aaron P. Hurst, 2003-2007
// ahurst@eecs.berkeley.edu
//
/*===================================================================*/
#include <stdio.h>
#include <stdlib.h>
#include <math.h>
#include <limits.h>
#include "place_base.h"
// --------------------------------------------------------------------
// globalPreplace()
//
/// \brief Place pad ring, leaving a core area to meet a desired utilization.
//
/// Sets the position of pads that aren't already fixed.
///
/// Computes g_place_coreBounds and g_place_padBounds. Determines
/// g_place_rowHeight.
//
// --------------------------------------------------------------------
void globalPreplace(float utilization) {
int i, c, h, numRows;
float coreArea = 0, totalArea = 0;
int padCount = 0;
float area;
ConcreteCell **padCells = NULL;
AbstractCell *padType = NULL;
ConcreteCell *cell;
float nextPos;
int remainingPads, northPads, southPads, eastPads, westPads;
printf("PLAC-00 : Placing IO pads\n");;
// identify the pads and compute the total core area
g_place_coreBounds.x = g_place_coreBounds.y = 0;
g_place_coreBounds.w = g_place_coreBounds.h = -INT_MAX;
for(c=0; c<g_place_numCells; c++) if (g_place_concreteCells[c]) {
cell = g_place_concreteCells[c];
area = getCellArea(cell);
if (cell->m_parent->m_pad) {
padType = cell->m_parent;
} else {
coreArea += area;
g_place_rowHeight = cell->m_parent->m_height;
}
if (cell->m_fixed) {
g_place_coreBounds.x = g_place_coreBounds.x < cell->m_x ? g_place_coreBounds.x : cell->m_x;
g_place_coreBounds.y = g_place_coreBounds.y < cell->m_y ? g_place_coreBounds.y : cell->m_y;
g_place_coreBounds.w = g_place_coreBounds.w > cell->m_x ? g_place_coreBounds.w : cell->m_x;
g_place_coreBounds.h = g_place_coreBounds.h > cell->m_y ? g_place_coreBounds.h : cell->m_y;
} else if (cell->m_parent->m_pad) {
padCells = realloc(padCells, sizeof(ConcreteCell **)*(padCount+1));
padCells[padCount++] = cell;
}
totalArea += area;
}
if (!padType) {
printf("ERROR: No pad cells\n");
exit(1);
}
g_place_padBounds.w -= g_place_padBounds.x;
g_place_padBounds.h -= g_place_padBounds.y;
coreArea /= utilization;
// create the design boundaries
numRows = sqrt(coreArea)/g_place_rowHeight+1;
h = numRows * g_place_rowHeight;
g_place_coreBounds.h = g_place_coreBounds.h > h ? g_place_coreBounds.h : h;
g_place_coreBounds.w = g_place_coreBounds.w > coreArea/g_place_coreBounds.h ?
g_place_coreBounds.w : coreArea/g_place_coreBounds.h;
// increase the dimensions by the width of the padring
g_place_padBounds = g_place_coreBounds;
if (padCount) {
printf("PLAC-05 : \tpreplacing %d pad cells\n", padCount);
g_place_padBounds.x -= padType->m_width;
g_place_padBounds.y -= padType->m_height;
g_place_padBounds.w = g_place_coreBounds.w+2*padType->m_width;
g_place_padBounds.h = g_place_coreBounds.h+2*padType->m_height;
}
printf("PLAC-05 : \tplaceable rows : %d\n", numRows);
printf("PLAC-05 : \tcore dimensions : %.0fx%.0f\n",
g_place_coreBounds.w, g_place_coreBounds.h);
printf("PLAC-05 : \tchip dimensions : %.0fx%.0f\n",
g_place_padBounds.w, g_place_padBounds.h);
remainingPads = padCount;
c = 0;
// north pads
northPads = remainingPads/4; remainingPads -= northPads;
nextPos = 0;
for(i=0; i<northPads; i++) {
cell = padCells[c++];
cell->m_x = g_place_padBounds.x+cell->m_parent->m_width*0.5 + nextPos;
cell->m_y = g_place_padBounds.y+cell->m_parent->m_height*0.5;
nextPos += (g_place_padBounds.w-padType->m_width) / northPads;
}
// south pads
southPads = remainingPads/3; remainingPads -= southPads;
nextPos = 0;
for(i=0; i<southPads; i++) {
cell = padCells[c++];
cell->m_x = g_place_padBounds.w+g_place_padBounds.x-cell->m_parent->m_width*0.5 - nextPos;
cell->m_y = g_place_padBounds.h+g_place_padBounds.y-cell->m_parent->m_height*0.5;
nextPos += (g_place_padBounds.w-2*padType->m_width) / southPads;
}
// east pads
eastPads = remainingPads/2; remainingPads -= eastPads;
nextPos = 0;
for(i=0; i<eastPads; i++) {
cell = padCells[c++];
cell->m_x = g_place_padBounds.w+g_place_padBounds.x-cell->m_parent->m_width*0.5;
cell->m_y = g_place_padBounds.y+cell->m_parent->m_height*0.5 + nextPos;
nextPos += (g_place_padBounds.h-padType->m_height) / eastPads;
}
// west pads
westPads = remainingPads;
nextPos = 0;
for(i=0; i<westPads; i++) {
cell = padCells[c++];
cell->m_x = g_place_padBounds.x+cell->m_parent->m_width*0.5;
cell->m_y = g_place_padBounds.h+g_place_padBounds.y-cell->m_parent->m_height*0.5 - nextPos;
nextPos += (g_place_padBounds.h-padType->m_height) / westPads;
}
}
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