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|
/**CFile****************************************************************
FileName [ioWriteVerilog.c]
SystemName [ABC: Logic synthesis and verification system.]
PackageName [Command processing package.]
Synopsis [Procedures to output a special subset of Verilog.]
Author [Alan Mishchenko]
Affiliation [UC Berkeley]
Date [Ver. 1.0. Started - June 20, 2005.]
Revision [$Id: ioWriteVerilog.c,v 1.00 2005/06/20 00:00:00 alanmi Exp $]
***********************************************************************/
#include "io.h"
////////////////////////////////////////////////////////////////////////
/// DECLARATIONS ///
////////////////////////////////////////////////////////////////////////
static void Io_WriteVerilogInt( FILE * pFile, Abc_Ntk_t * pNtk );
static void Io_WriteVerilogPis( FILE * pFile, Abc_Ntk_t * pNtk, int Start );
static void Io_WriteVerilogPos( FILE * pFile, Abc_Ntk_t * pNtk, int Start );
static void Io_WriteVerilogWires( FILE * pFile, Abc_Ntk_t * pNtk, int Start );
static void Io_WriteVerilogNodes( FILE * pFile, Abc_Ntk_t * pNtk );
static void Io_WriteVerilogArgs( FILE * pFile, Abc_Obj_t * pObj, int nInMax, int fPadZeros );
static int Io_WriteVerilogCheckNtk( Abc_Ntk_t * pNtk );
static char * Io_WriteVerilogGetName( Abc_Obj_t * pObj );
////////////////////////////////////////////////////////////////////////
/// FUNCTION DEFINITIONS ///
////////////////////////////////////////////////////////////////////////
/**Function*************************************************************
Synopsis [Write verilog.]
Description []
SideEffects []
SeeAlso []
***********************************************************************/
void Io_WriteVerilog( Abc_Ntk_t * pNtk, char * pFileName )
{
FILE * pFile;
if ( !Abc_NtkIsSopNetlist(pNtk) || !Io_WriteVerilogCheckNtk(pNtk) )
{
printf( "Io_WriteVerilog(): Can write Verilog for a very special subset of logic networks.\n" );
printf( "The current network is not in the subset; writing Verilog is not performed.\n" );
return;
}
if ( Abc_NtkLatchNum(pNtk) > 0 )
printf( "Io_WriteVerilog(): Warning: only combinational portion is being written.\n" );
// start the output stream
pFile = fopen( pFileName, "w" );
if ( pFile == NULL )
{
fprintf( stdout, "Io_WriteVerilog(): Cannot open the output file \"%s\".\n", pFileName );
return;
}
// write the equations for the network
Io_WriteVerilogInt( pFile, pNtk );
fprintf( pFile, "\n" );
fclose( pFile );
}
/**Function*************************************************************
Synopsis [Writes verilog.]
Description []
SideEffects []
SeeAlso []
***********************************************************************/
void Io_WriteVerilogInt( FILE * pFile, Abc_Ntk_t * pNtk )
{
// write inputs and outputs
fprintf( pFile, "// Benchmark \"%s\" written by ABC on %s\n", pNtk->pName, Extra_TimeStamp() );
fprintf( pFile, "module %s (\n ", Abc_NtkName(pNtk) );
Io_WriteVerilogPis( pFile, pNtk, 3 );
fprintf( pFile, ",\n " );
Io_WriteVerilogPos( pFile, pNtk, 3 );
fprintf( pFile, " );\n" );
// write inputs, outputs and wires
fprintf( pFile, " input" );
Io_WriteVerilogPis( pFile, pNtk, 5 );
fprintf( pFile, ";\n" );
fprintf( pFile, " output" );
Io_WriteVerilogPos( pFile, pNtk, 5 );
fprintf( pFile, ";\n" );
fprintf( pFile, " wire" );
Io_WriteVerilogWires( pFile, pNtk, 4 );
fprintf( pFile, ";\n" );
// write the nodes
Io_WriteVerilogNodes( pFile, pNtk );
// finalize the file
fprintf( pFile, "endmodule\n\n" );
fclose( pFile );
}
/**Function*************************************************************
Synopsis [Writes the primary inputs.]
Description []
SideEffects []
SeeAlso []
***********************************************************************/
void Io_WriteVerilogPis( FILE * pFile, Abc_Ntk_t * pNtk, int Start )
{
Abc_Obj_t * pTerm, * pNet;
int LineLength;
int AddedLength;
int NameCounter;
int i;
LineLength = Start;
NameCounter = 0;
Abc_NtkForEachCi( pNtk, pTerm, i )
{
pNet = Abc_ObjFanout0(pTerm);
// get the line length after this name is written
AddedLength = strlen(Abc_ObjName(pNet)) + 2;
if ( NameCounter && LineLength + AddedLength + 3 > IO_WRITE_LINE_LENGTH )
{ // write the line extender
fprintf( pFile, "\n " );
// reset the line length
LineLength = 3;
NameCounter = 0;
}
fprintf( pFile, " %s%s", Abc_ObjName(pNet), (i==Abc_NtkCiNum(pNtk)-1)? "" : "," );
LineLength += AddedLength;
NameCounter++;
}
}
/**Function*************************************************************
Synopsis [Writes the primary outputs.]
Description []
SideEffects []
SeeAlso []
***********************************************************************/
void Io_WriteVerilogPos( FILE * pFile, Abc_Ntk_t * pNtk, int Start )
{
Abc_Obj_t * pTerm, * pNet;
int LineLength;
int AddedLength;
int NameCounter;
int i;
LineLength = Start;
NameCounter = 0;
Abc_NtkForEachCo( pNtk, pTerm, i )
{
pNet = Abc_ObjFanin0(pTerm);
// get the line length after this name is written
AddedLength = strlen(Abc_ObjName(pNet)) + 2;
if ( NameCounter && LineLength + AddedLength + 3 > IO_WRITE_LINE_LENGTH )
{ // write the line extender
fprintf( pFile, "\n " );
// reset the line length
LineLength = 3;
NameCounter = 0;
}
fprintf( pFile, " %s%s", Abc_ObjName(pNet), (i==Abc_NtkCoNum(pNtk)-1)? "" : "," );
LineLength += AddedLength;
NameCounter++;
}
}
/**Function*************************************************************
Synopsis [Writes the wires.]
Description []
SideEffects []
SeeAlso []
***********************************************************************/
void Io_WriteVerilogWires( FILE * pFile, Abc_Ntk_t * pNtk, int Start )
{
Abc_Obj_t * pTerm, * pNet;
int LineLength;
int AddedLength;
int NameCounter;
int i, Counter, nNodes;
// count the number of wires
nNodes = 0;
Abc_NtkForEachNode( pNtk, pTerm, i )
{
if ( i == 0 )
continue;
pNet = Abc_ObjFanout0(pTerm);
if ( Abc_ObjIsCo(Abc_ObjFanout0(pNet)) )
continue;
nNodes++;
}
// write the wires
Counter = 0;
LineLength = Start;
NameCounter = 0;
Abc_NtkForEachNode( pNtk, pTerm, i )
{
if ( i == 0 )
continue;
pNet = Abc_ObjFanout0(pTerm);
if ( Abc_ObjIsCo(Abc_ObjFanout0(pNet)) )
continue;
Counter++;
// get the line length after this name is written
AddedLength = strlen(Abc_ObjName(pNet)) + 2;
if ( NameCounter && LineLength + AddedLength + 3 > IO_WRITE_LINE_LENGTH )
{ // write the line extender
fprintf( pFile, "\n " );
// reset the line length
LineLength = 3;
NameCounter = 0;
}
fprintf( pFile, " %s%s", Io_WriteVerilogGetName(pNet), (Counter==nNodes)? "" : "," );
LineLength += AddedLength;
NameCounter++;
}
}
/**Function*************************************************************
Synopsis [Writes the wires.]
Description []
SideEffects []
SeeAlso []
***********************************************************************/
void Io_WriteVerilogNodes( FILE * pFile, Abc_Ntk_t * pNtk )
{
Abc_Obj_t * pObj;
int i, nCubes, nFanins, Counter, nDigits, fPadZeros;
char * pName;
extern int Abc_SopIsExorType( char * pSop );
nDigits = Extra_Base10Log( Abc_NtkNodeNum(pNtk) );
Counter = 1;
Abc_NtkForEachNode( pNtk, pObj, i )
{
nFanins = Abc_ObjFaninNum(pObj);
nCubes = Abc_SopGetCubeNum(pObj->pData);
if ( Abc_SopIsAndType(pObj->pData) )
pName = "ts_and", fPadZeros = 1;
else if ( Abc_SopIsExorType(pObj->pData) )
pName = "ts_xor", fPadZeros = 1;
else // if ( Abc_SopIsOrType(pObj->pData) )
pName = "ts_or", fPadZeros = 0;
assert( nCubes < 2 );
if ( nCubes == 0 )
{
fprintf( pFile, " ts_gnd g%0*d ", nDigits, Counter++ );
Io_WriteVerilogArgs( pFile, pObj, 0, fPadZeros );
}
else if ( nCubes == 1 && nFanins == 0 )
{
fprintf( pFile, " ts_vdd g%0*d ", nDigits, Counter++ );
Io_WriteVerilogArgs( pFile, pObj, 0, fPadZeros );
}
else if ( nFanins == 1 && Abc_SopIsInv(pObj->pData) )
{
fprintf( pFile, " ts_inv g%0*d ", nDigits, Counter++ );
Io_WriteVerilogArgs( pFile, pObj, 1, fPadZeros );
}
else if ( nFanins == 1 )
{
fprintf( pFile, " ts_buf g%0*d ", nDigits, Counter++ );
Io_WriteVerilogArgs( pFile, pObj, 1, fPadZeros );
}
else if ( nFanins <= 4 )
{
fprintf( pFile, " %s%d g%0*d ", pName, 4, nDigits, Counter++ );
Io_WriteVerilogArgs( pFile, pObj, 4, fPadZeros );
}
else if ( nFanins <= 6 )
{
fprintf( pFile, " %s%d g%0*d ", pName, 6, nDigits, Counter++ );
Io_WriteVerilogArgs( pFile, pObj, 6, fPadZeros );
}
else if ( nFanins == 7 )
{
fprintf( pFile, " %s%d g%0*d ", pName, 7, nDigits, Counter++ );
Io_WriteVerilogArgs( pFile, pObj, 7, fPadZeros );
}
else if ( nFanins == 8 )
{
fprintf( pFile, " %s%d g%0*d ", pName, 8, nDigits, Counter++ );
Io_WriteVerilogArgs( pFile, pObj, 8, fPadZeros );
}
else if ( nFanins <= 16 )
{
fprintf( pFile, " %s%d g%0*d ", pName, 16, nDigits, Counter++ );
Io_WriteVerilogArgs( pFile, pObj, 16, fPadZeros );
}
else if ( nFanins <= 32 )
{
fprintf( pFile, " %s%d g%0*d ", pName, 32, nDigits, Counter++ );
Io_WriteVerilogArgs( pFile, pObj, 32, fPadZeros );
}
else if ( nFanins <= 64 )
{
fprintf( pFile, " %s%d g%0*d ", pName, 64, nDigits, Counter++ );
Io_WriteVerilogArgs( pFile, pObj, 64, fPadZeros );
}
else if ( nFanins <= 128 )
{
fprintf( pFile, " %s%d g%0*d ", pName, 128, nDigits, Counter++ );
Io_WriteVerilogArgs( pFile, pObj, 128, fPadZeros );
}
}
}
/**Function*************************************************************
Synopsis [Writes the inputs.]
Description []
SideEffects []
SeeAlso []
***********************************************************************/
void Io_WriteVerilogArgs( FILE * pFile, Abc_Obj_t * pObj, int nInMax, int fPadZeros )
{
Abc_Obj_t * pFanin;
int i, Counter = 2;
fprintf( pFile, "(.z (%s)", Io_WriteVerilogGetName(Abc_ObjFanout0(pObj)) );
Abc_ObjForEachFanin( pObj, pFanin, i )
{
if ( Counter++ % 4 == 0 )
fprintf( pFile, "\n " );
fprintf( pFile, " .i%d (%s)", i+1, Io_WriteVerilogGetName(Abc_ObjFanin(pObj,i)) );
}
for ( ; i < nInMax; i++ )
{
if ( Counter++ % 4 == 0 )
fprintf( pFile, "\n " );
fprintf( pFile, " .i%d (%s)", i+1, fPadZeros? "1\'b0" : "1\'b1" );
}
fprintf( pFile, ");\n" );
}
/**Function*************************************************************
Synopsis []
Description []
SideEffects []
SeeAlso []
***********************************************************************/
int Io_WriteVerilogCheckNtk( Abc_Ntk_t * pNtk )
{
Abc_Obj_t * pObj;
char * pSop;
int i, k, nFanins;
Abc_NtkForEachNode( pNtk, pObj, i )
{
if ( Abc_SopGetCubeNum(pObj->pData) > 1 )
{
printf( "Node %s contains a cover with more than one cube.\n", Abc_ObjName(pObj) );
return 0;
}
nFanins = Abc_ObjFaninNum(pObj);
if ( nFanins < 2 )
continue;
pSop = pObj->pData;
for ( k = 0; k < nFanins; k++ )
if ( pSop[k] != '1' )
{
printf( "Node %s contains a cover with non-positive literals.\n", Abc_ObjName(pObj) );
return 0;
}
}
return 1;
}
/**Function*************************************************************
Synopsis [Prepares the name for writing the Verilog file.]
Description []
SideEffects []
SeeAlso []
***********************************************************************/
char * Io_WriteVerilogGetName( Abc_Obj_t * pObj )
{
static char Buffer[20];
char * pName;
pName = Abc_ObjName(pObj);
if ( pName[0] != '[' )
return pName;
// replace opening bracket by the escape sign and closing bracket by space
// as a result of this transformation, the length of the name does not change
strcpy( Buffer, pName );
Buffer[0] = '\\';
Buffer[strlen(Buffer)-1] = ' ';
return Buffer;
}
////////////////////////////////////////////////////////////////////////
/// END OF FILE ///
////////////////////////////////////////////////////////////////////////
|
