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/**CFile****************************************************************
FileName [gia.c]
SystemName [ABC: Logic synthesis and verification system.]
PackageName [Scalable AIG package.]
Synopsis [Structural detection of enables, sets and resets.]
Author [Alan Mishchenko]
Affiliation [UC Berkeley]
Date [Ver. 1.0. Started - June 20, 2005.]
Revision [$Id: gia.c,v 1.00 2005/06/20 00:00:00 alanmi Exp $]
***********************************************************************/
#include "gia.h"
////////////////////////////////////////////////////////////////////////
/// DECLARATIONS ///
////////////////////////////////////////////////////////////////////////
////////////////////////////////////////////////////////////////////////
/// FUNCTION DEFINITIONS ///
////////////////////////////////////////////////////////////////////////
/**Function*************************************************************
Synopsis [Collects the supergate.]
Description []
SideEffects []
SeeAlso []
***********************************************************************/
void Gia_CollectSuper_rec( Gia_Man_t * p, Gia_Obj_t * pObj, Vec_Int_t * vSuper )
{
// if the new node is complemented or a PI, another gate begins
if ( Gia_IsComplement(pObj) || Gia_ObjIsCi(pObj) )
{
Vec_IntPushUnique( vSuper, Gia_ObjId(p, Gia_Regular(pObj)) );
return;
}
assert( Gia_ObjIsAnd(pObj) );
// go through the branches
Gia_CollectSuper_rec( p, Gia_ObjChild0(pObj), vSuper );
Gia_CollectSuper_rec( p, Gia_ObjChild1(pObj), vSuper );
}
/**Function*************************************************************
Synopsis [Collects the supergate.]
Description []
SideEffects []
SeeAlso []
***********************************************************************/
void Gia_CollectSuper( Gia_Man_t * p, Gia_Obj_t * pObj, Vec_Int_t * vSuper )
{
assert( !Gia_IsComplement(pObj) );
Vec_IntClear( vSuper );
// Gia_CollectSuper_rec( p, pObj, vSuper );
if ( Gia_ObjIsAnd(pObj) )
{
Vec_IntPushUnique( vSuper, Gia_ObjId(p, Gia_ObjFanin0(pObj)) );
Vec_IntPushUnique( vSuper, Gia_ObjId(p, Gia_ObjFanin1(pObj)) );
}
else
Vec_IntPushUnique( vSuper, Gia_ObjId(p, Gia_Regular(pObj)) );
}
/**Function*************************************************************
Synopsis []
Description []
SideEffects []
SeeAlso []
***********************************************************************/
void Gia_ManPrintSignals( Gia_Man_t * p, int * pFreq, char * pStr )
{
Vec_Int_t * vObjs;
int i, Counter = 0, nTotal = 0;
vObjs = Vec_IntAlloc( 100 );
for ( i = 0; i < Gia_ManObjNum(p); i++ )
if ( pFreq[i] > 1 )
{
nTotal += pFreq[i];
Counter++;
}
printf( "%s (total = %d driven = %d)\n", pStr, Counter, nTotal );
Counter = 0;
for ( i = 0; i < Gia_ManObjNum(p); i++ )
if ( pFreq[i] > 1 )
{
printf( "%3d : Obj = %6d Refs = %6d Freq = %6d\n",
++Counter, i, Gia_ObjRefs(p, Gia_ManObj(p,i)), pFreq[i] );
Vec_IntPush( vObjs, i );
}
Vec_IntFree( vObjs );
}
/**Function*************************************************************
Synopsis []
Description []
SideEffects []
SeeAlso []
***********************************************************************/
void Gia_ManDetectSeqSignals( Gia_Man_t * p, int fSetReset )
{
Vec_Int_t * vSuper;
Gia_Obj_t * pFlop, * pObjC, * pObj0, * pObj1, * pNode, * pTemp;
int i, k, Ent, * pSets, * pResets, * pEnables;
int nHaveSetReset = 0, nHaveEnable = 0;
assert( Gia_ManRegNum(p) > 0 );
pSets = ABC_CALLOC( int, Gia_ManObjNum(p) );
pResets = ABC_CALLOC( int, Gia_ManObjNum(p) );
pEnables = ABC_CALLOC( int, Gia_ManObjNum(p) );
vSuper = Vec_IntAlloc( 100 );
Gia_ManForEachRi( p, pFlop, i )
{
pNode = Gia_ObjFanin0(pFlop);
if ( !Gia_ObjIsAnd(pNode) )
continue;
// detect sets/resets
Gia_CollectSuper( p, pNode, vSuper );
if ( Gia_ObjFaninC0(pFlop) )
Vec_IntForEachEntry( vSuper, Ent, k )
pSets[Ent]++;
else
Vec_IntForEachEntry( vSuper, Ent, k )
pResets[Ent]++;
// detect enables
if ( !Gia_ObjIsMuxType(pNode) )
continue;
pObjC = Gia_ObjRecognizeMux( pNode, &pObj0, &pObj1 );
pTemp = Gia_ObjRiToRo( p, pFlop );
if ( Gia_Regular(pObj0) != pTemp && Gia_Regular(pObj1) != pTemp )
continue;
if ( !Gia_ObjFaninC0(pFlop) )
{
pObj0 = Gia_Not(pObj0);
pObj1 = Gia_Not(pObj1);
}
if ( Gia_IsComplement(pObjC) )
{
pObjC = Gia_Not(pObjC);
pTemp = pObj0;
pObj0 = pObj1;
pObj1 = pTemp;
}
// detect controls
// Gia_CollectSuper( p, pObjC, vSuper );
// Vec_IntForEachEntry( vSuper, Ent, k )
// pEnables[Ent]++;
pEnables[Gia_ObjId(p, pObjC)]++;
nHaveEnable++;
}
Gia_ManForEachRi( p, pFlop, i )
{
pNode = Gia_ObjFanin0(pFlop);
if ( !Gia_ObjIsAnd(pNode) )
continue;
// detect sets/resets
Gia_CollectSuper( p, pNode, vSuper );
Vec_IntForEachEntry( vSuper, Ent, k )
if ( pSets[Ent] > 1 || pResets[Ent] > 1 )
{
nHaveSetReset++;
break;
}
}
Vec_IntFree( vSuper );
Gia_ManCreateRefs( p );
printf( "Flops with set/reset = %6d. Flops with enable = %6d.\n", nHaveSetReset, nHaveEnable );
if ( fSetReset )
{
Gia_ManPrintSignals( p, pSets, "Set signals" );
Gia_ManPrintSignals( p, pResets, "Reset signals" );
}
Gia_ManPrintSignals( p, pEnables, "Enable signals" );
ABC_FREE( p->pRefs );
ABC_FREE( pSets );
ABC_FREE( pResets );
ABC_FREE( pEnables );
}
////////////////////////////////////////////////////////////////////////
/// END OF FILE ///
////////////////////////////////////////////////////////////////////////
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