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Commit f9af41ba by Alan Mishchenko
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Adding an option to write Verilog with LUT instances.

parent 73f8b598
Showing with 196 additions and 3 deletions
src/base/io/io.c
......@@ -2982,14 +2982,27 @@ usage:
***********************************************************************/
int IoCommandWriteVerilog( Abc_Frame_t * pAbc, int argc, char **argv )
{
extern void Io_WriteVerilogLut( Abc_Ntk_t * pNtk, char * pFileName, int nLutSize );
char * pFileName;
int c, fOnlyAnds = 0;
int nLutSize = -1;
Extra_UtilGetoptReset();
while ( ( c = Extra_UtilGetopt( argc, argv, "ah" ) ) != EOF )
while ( ( c = Extra_UtilGetopt( argc, argv, "Kah" ) ) != EOF )
{
switch ( c )
{
case 'K':
if ( globalUtilOptind >= argc )
{
Abc_Print( -1, "Command line switch \"-K\" should be followed by an integer.\n" );
goto usage;
}
nLutSize = atoi(argv[globalUtilOptind]);
globalUtilOptind++;
if ( nLutSize < 2 || nLutSize > 6 )
goto usage;
break;
case 'a':
fOnlyAnds ^= 1;
break;
......@@ -3017,13 +3030,16 @@ int IoCommandWriteVerilog( Abc_Frame_t * pAbc, int argc, char **argv )
Io_WriteVerilog( pNtkTemp, pFileName, 1 );
Abc_NtkDelete( pNtkTemp );
}
else if ( nLutSize >= 2 && nLutSize <= 6 )
Io_WriteVerilogLut( pAbc->pNtkCur, pFileName, nLutSize );
else
Io_Write( pAbc->pNtkCur, pFileName, IO_FILE_VERILOG );
Io_Write( pAbc->pNtkCur, pFileName, IO_FILE_VERILOG );
return 0;
usage:
fprintf( pAbc->Err, "usage: write_verilog [-ah] <file>\n" );
fprintf( pAbc->Err, "usage: write_verilog [-K num] [-ah] <file>\n" );
fprintf( pAbc->Err, "\t writes the current network in Verilog format\n" );
fprintf( pAbc->Err, "\t-K num : write the network using instances of K-LUTs (2 <= K <= %d) [default = not used]\n", 6, nLutSize );
fprintf( pAbc->Err, "\t-a : toggle writing expressions with only ANDs (without XORs and MUXes) [default = %s]\n", fOnlyAnds? "yes":"no" );
fprintf( pAbc->Err, "\t-h : print the help massage\n" );
fprintf( pAbc->Err, "\tfile : the name of the file to write\n" );
......
src/base/io/ioWriteVerilog.c
......@@ -653,6 +653,183 @@ char * Io_WriteVerilogGetName( char * pName )
return Buffer;
}
/**Function*************************************************************
Synopsis [Write the network of K-input LUTs.]
Description []
SideEffects []
SeeAlso []
***********************************************************************/
void Io_WriteLutModule( FILE * pFile, int nLutSize )
{
fprintf( pFile, "module lut%d #( parameter TT = %d\'h0 ) ( input [%d:0] in, output out );\n", nLutSize, 1<<nLutSize, nLutSize-1 );
fprintf( pFile, " assign out = TT[in];\n" );
fprintf( pFile, "endmodule\n\n" );
}
void Io_WriteVerilogObjectsLut( FILE * pFile, Abc_Ntk_t * pNtk, int nLutSize )
{
Abc_Ntk_t * pNtkBox;
Abc_Obj_t * pObj, * pTerm;
int i, k, Counter, nDigits, Length = 0;
// write boxes
nDigits = Abc_Base10Log( Abc_NtkBoxNum(pNtk)-Abc_NtkLatchNum(pNtk) );
Counter = 0;
Abc_NtkForEachBox( pNtk, pObj, i )
{
if ( Abc_ObjIsLatch(pObj) )
continue;
pNtkBox = (Abc_Ntk_t *)pObj->pData;
fprintf( pFile, " %s box%0*d", pNtkBox->pName, nDigits, Counter++ );
fprintf( pFile, "(" );
Abc_NtkForEachPi( pNtkBox, pTerm, k )
{
fprintf( pFile, ".%s", Io_WriteVerilogGetName(Abc_ObjName(Abc_ObjFanout0(pTerm))) );
fprintf( pFile, "(%s), ", Io_WriteVerilogGetName(Abc_ObjName(Abc_ObjFanin0(Abc_ObjFanin(pObj,k)))) );
}
Abc_NtkForEachPo( pNtkBox, pTerm, k )
{
fprintf( pFile, ".%s", Io_WriteVerilogGetName(Abc_ObjName(Abc_ObjFanin0(pTerm))) );
fprintf( pFile, "(%s)%s", Io_WriteVerilogGetName(Abc_ObjName(Abc_ObjFanout0(Abc_ObjFanout(pObj,k)))), k==Abc_NtkPoNum(pNtkBox)-1? "":", " );
}
fprintf( pFile, ");\n" );
}
// find the longest signal name
Abc_NtkForEachNode( pNtk, pObj, i )
{
Length = Abc_MaxInt( Length, strlen(Io_WriteVerilogGetName(Abc_ObjName(Abc_ObjFanout0(pObj)))) );
Abc_ObjForEachFanin( pObj, pTerm, k )
Length = Abc_MaxInt( Length, strlen(Io_WriteVerilogGetName(Abc_ObjName(pTerm))) );
}
// write LUT instances
nDigits = Abc_Base10Log( Abc_NtkNodeNum(pNtk) );
Counter = 0;
Abc_NtkForEachNode( pNtk, pObj, i )
{
word Truth = Abc_SopToTruth( (char *)pObj->pData, Abc_ObjFaninNum(pObj) );
fprintf( pFile, " lut%d #(%d\'h", nLutSize, 1<<nLutSize );
if ( nLutSize == 6 )
fprintf( pFile, "%08x%08x", (unsigned)(Truth >> 32), (unsigned)Truth );
else
fprintf( pFile, "%0*x", 1<<(nLutSize-2), Abc_InfoMask(1 << nLutSize) & Truth );
fprintf( pFile, ") lut_%0*d ( {", nDigits, Counter++ );
for ( k = nLutSize - 1; k >= Abc_ObjFaninNum(pObj); k-- )
fprintf( pFile, "%*s, ", Length, "1\'b0" );
for ( k = Abc_ObjFaninNum(pObj) - 1; k >= 0; k-- )
fprintf( pFile, "%*s%s", Length, Io_WriteVerilogGetName(Abc_ObjName(Abc_ObjFanin(pObj, k))), k==0 ? "":", " );
fprintf( pFile, "}, %*s );\n", Length, Io_WriteVerilogGetName(Abc_ObjName(Abc_ObjFanout0(pObj))) );
}
}
void Io_WriteVerilogLutInt( FILE * pFile, Abc_Ntk_t * pNtk, int nLutSize )
{
// write inputs and outputs
// fprintf( pFile, "module %s ( gclk,\n ", Abc_NtkName(pNtk) );
fprintf( pFile, "module %s ( ", Io_WriteVerilogGetName(Abc_NtkName(pNtk)) );
// add the clock signal if it does not exist
if ( Abc_NtkLatchNum(pNtk) > 0 && Nm_ManFindIdByName(pNtk->pManName, "clock", ABC_OBJ_PI) == -1 )
fprintf( pFile, "clock, " );
// write other primary inputs
fprintf( pFile, "\n " );
if ( Abc_NtkPiNum(pNtk) > 0 )
{
Io_WriteVerilogPis( pFile, pNtk, 3 );
fprintf( pFile, ",\n " );
}
if ( Abc_NtkPoNum(pNtk) > 0 )
Io_WriteVerilogPos( pFile, pNtk, 3 );
fprintf( pFile, " );\n\n" );
// add the clock signal if it does not exist
if ( Abc_NtkLatchNum(pNtk) > 0 && Nm_ManFindIdByName(pNtk->pManName, "clock", ABC_OBJ_PI) == -1 )
fprintf( pFile, " input clock;\n" );
// write inputs, outputs, registers, and wires
if ( Abc_NtkPiNum(pNtk) > 0 )
{
// fprintf( pFile, " input gclk," );
fprintf( pFile, " input " );
Io_WriteVerilogPis( pFile, pNtk, 10 );
fprintf( pFile, ";\n" );
}
if ( Abc_NtkPoNum(pNtk) > 0 )
{
fprintf( pFile, " output" );
Io_WriteVerilogPos( pFile, pNtk, 5 );
fprintf( pFile, ";\n\n" );
}
// if this is not a blackbox, write internal signals
if ( !Abc_NtkHasBlackbox(pNtk) )
{
if ( Abc_NtkLatchNum(pNtk) > 0 )
{
fprintf( pFile, " reg" );
Io_WriteVerilogRegs( pFile, pNtk, 4 );
fprintf( pFile, ";\n\n" );
}
if ( Io_WriteVerilogWiresCount(pNtk) > 0 )
{
fprintf( pFile, " wire" );
Io_WriteVerilogWires( pFile, pNtk, 4 );
fprintf( pFile, ";\n\n" );
}
// write nodes
Io_WriteVerilogObjectsLut( pFile, pNtk, nLutSize );
// write registers
if ( Abc_NtkLatchNum(pNtk) > 0 )
{
fprintf( pFile, "\n" );
Io_WriteVerilogLatches( pFile, pNtk );
}
}
// finalize the file
fprintf( pFile, "\nendmodule\n\n" );
}
void Io_WriteVerilogLut( Abc_Ntk_t * pNtk, char * pFileName, int nLutSize )
{
FILE * pFile;
Abc_Ntk_t * pNtkTemp;
Abc_Obj_t * pObj;
int i, Counter = 0;
Abc_NtkForEachNode( pNtk, pObj, i )
if ( Abc_ObjFaninNum(pObj) > nLutSize )
{
if ( Counter < 3 )
printf( "Node \"%s\" has the fanin count (%d) larger than the LUT size (%d).\n", Abc_ObjName(pObj), Abc_ObjFaninNum(pObj), nLutSize );
Counter++;
}
if ( Counter )
{
printf( "In total, %d internal logic nodes exceeded the fanout count limit.\n", Counter );
return;
}
// 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
fprintf( pFile, "// Benchmark \"%s\" written by ABC on %s\n", pNtk->pName, Extra_TimeStamp() );
fprintf( pFile, "\n" );
Io_WriteLutModule( pFile, nLutSize );
pNtkTemp = Abc_NtkToNetlist( pNtk );
Abc_NtkToSop( pNtkTemp, -1, ABC_INFINITY );
Io_WriteVerilogLutInt( pFile, pNtkTemp, nLutSize );
Abc_NtkDelete( pNtkTemp );
fprintf( pFile, "\n" );
fclose( pFile );
}
////////////////////////////////////////////////////////////////////////
/// END OF FILE ///
////////////////////////////////////////////////////////////////////////
......
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