diff --git a/alliance/src/sea/src/DEF_drive.c b/alliance/src/sea/src/DEF_drive.c
index d68de59b..594e8789 100644
--- a/alliance/src/sea/src/DEF_drive.c
+++ b/alliance/src/sea/src/DEF_drive.c
@@ -1,5 +1,5 @@
 /*
- *  $Id: DEF_drive.c,v 1.6 2003/04/02 15:02:49 jpc Exp $
+ *  $Id: DEF_drive.c,v 1.7 2003/04/04 16:23:31 xtof Exp $
  *
  *  /----------------------------------------------------------------\
  *  |                                                                |
@@ -1144,6 +1144,8 @@ static void  fprintPIN(apLocon, apPhcon, asState)
      */
 
     fprintf(DEF_FILE, " + DIRECTION INPUT + USE GROUND");
+  } else if (isck(apLocon->NAME)) {
+    fprintf(DEF_FILE, " + DIRECTION INPUT + USE CLOCK");  
   } else 
     fprintf(DEF_FILE, " + DIRECTION %s",
                        DIRtoa(MBK2DEF_locondir(apLocon)));
@@ -1535,7 +1537,7 @@ static void  fprintNETS()
   for(pLoSig = LV_lofig->LOSIG, loSigNB = 0L;
       pLoSig != (losig_list*)NULL; pLoSig = pLoSig->NEXT) {
     sSig = getsigname(pLoSig);
-    if (isvdd(sSig) || isvss(sSig)) continue;
+    if (isvdd(sSig) || isvss(sSig) || isck(sSig)) continue;
 
     loSigNB += 1;
   }
@@ -1549,7 +1551,8 @@ static void  fprintNETS()
     sSig = getsigname(pLoSig);
     if (     isvdd(sSig) 
         ||   isvss(sSig)
-        || !strcmp(sSig, "cki")) continue;
+        ||   !strcmp(sSig, "cki")
+        ||   isck(sSig)) continue;
 
     fprintNET(pLoSig, C_USE_NONE);
   }
@@ -1579,7 +1582,8 @@ static void  fprintSPECIALNETS()
     sSig = getsigname(pLoSig);
     if (    !isvdd(sSig)
         &&  !isvss(sSig)
-        &&  strcmp(sSig, "cki")) continue;
+        &&  strcmp(sSig, "cki")
+        &&  !isck(sSig)) continue;
 
     loSigNB += 1;
   }
@@ -1597,6 +1601,7 @@ static void  fprintSPECIALNETS()
     if (  isvdd(sSig)       ) Use = C_USE_POWER;
     if (  isvss(sSig)       ) Use = C_USE_GROUND;
     if (!strcmp(sSig, "cki")) Use = C_USE_CLOCK;
+    if (  isck(sSig)        ) Use = C_USE_CLOCK;
     if (Use == C_USE_NONE) continue;
 
     fprintNET(pLoSig, Use);
diff --git a/alliance/src/sea/src/LEF_drive_sxlib.c b/alliance/src/sea/src/LEF_drive_sxlib.c
index 06bee4b6..bceb92ff 100644
--- a/alliance/src/sea/src/LEF_drive_sxlib.c
+++ b/alliance/src/sea/src/LEF_drive_sxlib.c
@@ -1,5 +1,5 @@
 /*
- *  $Id: LEF_drive_sxlib.c,v 1.2 2002/09/30 16:21:17 czo Exp $
+ *  $Id: LEF_drive_sxlib.c,v 1.3 2003/04/04 16:23:32 xtof Exp $
  *
  *  /----------------------------------------------------------------\
  *  |                                                                |
@@ -617,6 +617,10 @@ static void  phref2PINS()
         /* Create a new pin named from "sIOName". */
         m_AddPin(LV_pMACRO->lPIN, sIOName);
         LV_pMACRO->lPIN->DIRECTION = MBK2DEF_locondir(pLoCon);
+	if (isck(sIOName))
+	{
+	    LV_pMACRO->lPIN->USE = C_USE_GROUND;
+	}
         m_AddPort(LV_pMACRO->lPIN->lPORT, C_PORTITEM_LAYER, ALU1);
 
         pPIN = LV_pMACRO->lPIN;
@@ -674,6 +678,10 @@ static void  phseg2PINS()
           /* Create a new pin named from "pPhSeg->NAME". */
           m_AddPin(LV_pMACRO->lPIN, pPhSeg->NAME);
           LV_pMACRO->lPIN->DIRECTION = MBK2DEF_locondir(pLoCon);
+	  if (isck(pPhSeg->NAME))
+	  {
+	      LV_pMACRO->lPIN->USE = C_USE_CLOCK;
+	  }
 
           pPIN = LV_pMACRO->lPIN;
         }
@@ -728,12 +736,14 @@ static void  sortPINS()
   ePIN_t *pHeadOUTPUT, *pTailOUTPUT;
   ePIN_t *pHeadINPUT , *pTailINPUT;
   ePIN_t *pHeadPOWER , *pTailPOWER;
+  ePIN_t *pHeadCLOCK , *pTailCLOCK;
 
 
   pHeadINOUT  = pTailINOUT  = (ePIN_t*)NULL;
   pHeadOUTPUT = pTailOUTPUT = (ePIN_t*)NULL;
   pHeadINPUT  = pTailINPUT  = (ePIN_t*)NULL;
   pHeadPOWER  = pTailPOWER  = (ePIN_t*)NULL;
+  pHeadCLOCK  = pTailCLOCK  = (ePIN_t*)NULL;
 
   for(pPIN = LV_pMACRO->lPIN; pPIN != (ePIN_t*)NULL;) {
     pTmp = pPIN;
@@ -744,6 +754,9 @@ static void  sortPINS()
       case C_USE_GROUND:
         insertPIN(&pHeadPOWER, &pTailPOWER, pTmp);
         continue;
+      case C_USE_CLOCK:
+	insertPIN(&pHeadCLOCK, &pTailCLOCK, pTmp);
+	continue;
     } /* End of "USE" switch. */
 
     switch(pTmp->DIRECTION) {
@@ -783,6 +796,10 @@ static void  sortPINS()
   if (pHeadPOWER != (ePIN_t*)NULL) {
     *ppHead = pHeadPOWER;  ppHead = &(pTailPOWER->Next);
   }
+  
+  if (pHeadCLOCK != (ePIN_t*)NULL) {
+    *ppHead = pHeadCLOCK;  ppHead = &(pTailCLOCK->Next);
+  }
 
   *ppHead = (ePIN_t*)NULL;
 }