diff --git a/flow/designs/rapidus2hp/cva6/config.mk b/flow/designs/rapidus2hp/cva6/config.mk
index 4a6682267d..7a7bbdebbf 100644
--- a/flow/designs/rapidus2hp/cva6/config.mk
+++ b/flow/designs/rapidus2hp/cva6/config.mk
@@ -94,31 +94,31 @@ export ADDITIONAL_LIBS += $(PLATFORM_DIR)/ram/lib/sacrls0g0d1p64x128m2b1w0c1p0d0
 			 $(PLATFORM_DIR)/ram/lib/sacrls0g0d1p64x25m2b1w0c1p0d0i0s0cr0rr0rm4rw00ms0.lib
 
 
-DEFAULT_SDC_FILE  = $(DESIGN_HOME)/$(PLATFORM)/$(DESIGN_NICKNAME)/constraint.sdc
-_0P2A_6T_SDC_FILE = $(DESIGN_HOME)/$(PLATFORM)/$(DESIGN_NICKNAME)/constraint_0.2a_6T.sdc
-_0P2A_8T_SDC_FILE = $(DESIGN_HOME)/$(PLATFORM)/$(DESIGN_NICKNAME)/constraint_0.2a_8T.sdc
-_0P15_8T_SDC_FILE = $(DESIGN_HOME)/$(PLATFORM)/$(DESIGN_NICKNAME)/constraint_0.15_8T.sdc
-_0P3_6T_SDC_FILE  = $(DESIGN_HOME)/$(PLATFORM)/$(DESIGN_NICKNAME)/constraint_0.3_6T.sdc
-_0P3_8T_SDC_FILE  = $(DESIGN_HOME)/$(PLATFORM)/$(DESIGN_NICKNAME)/constraint_0.3_8T.sdc
+.DEFAULT_SDC_FILE  = $(DESIGN_HOME)/$(PLATFORM)/$(DESIGN_NICKNAME)/constraint.sdc
+._0P2A_6T_SDC_FILE = $(DESIGN_HOME)/$(PLATFORM)/$(DESIGN_NICKNAME)/constraint_0.2a_6T.sdc
+._0P2A_8T_SDC_FILE = $(DESIGN_HOME)/$(PLATFORM)/$(DESIGN_NICKNAME)/constraint_0.2a_8T.sdc
+._0P15_8T_SDC_FILE = $(DESIGN_HOME)/$(PLATFORM)/$(DESIGN_NICKNAME)/constraint_0.15_8T.sdc
+._0P3S_6T_SDC_FILE  = $(DESIGN_HOME)/$(PLATFORM)/$(DESIGN_NICKNAME)/constraint_0.3s_6T.sdc
+._0P3S_8T_SDC_FILE  = $(DESIGN_HOME)/$(PLATFORM)/$(DESIGN_NICKNAME)/constraint_0.3s_8T.sdc
 
 # Use $(if) to defer conditional eval until all makefiles are read
 export SDC_FILE = $(strip \
     $(if $(filter 0.2a,$(RAPIDUS_PDK_VERSION)), \
         $(if $(filter ra02h138_DST_45CPP,$(PLACE_SITE)), \
-            $(_0P2A_6T_SDC_FILE), \
-            $(_0P2A_8T_SDC_FILE) \
+            $(._0P2A_6T_SDC_FILE), \
+            $(._0P2A_8T_SDC_FILE) \
         ), \
         $(if $(filter 0.15,$(RAPIDUS_PDK_VERSION)), \
             $(if $(filter ra02h184_HST_45CPP,$(PLACE_SITE)), \
-                $(_0P15_8T_SDC_FILE), \
-                $(DEFAULT_SDC_FILE) \
+                $(._0P15_8T_SDC_FILE), \
+                $(.DEFAULT_SDC_FILE) \
             ), \
-            $(if $(filter 0.3,$(RAPIDUS_PDK_VERSION)), \
+            $(if $(filter 0.3s,$(RAPIDUS_PDK_VERSION)), \
                 $(if $(filter ra02h138_DST_45CPP,$(PLACE_SITE)), \
-                    $(_0P3_6T_SDC_FILE), \
-                    $(_0P3_8T_SDC_FILE) \
+                    $(._0P3S_6T_SDC_FILE), \
+                    $(._0P3S_8T_SDC_FILE) \
                 ), \
-                $(DEFAULT_SDC_FILE) \
+                $(.DEFAULT_SDC_FILE) \
             ) \
         ) \
     ))
diff --git a/flow/designs/rapidus2hp/cva6/constraint_0.3_6T.sdc b/flow/designs/rapidus2hp/cva6/constraint_0.3s_6T.sdc
similarity index 100%
rename from flow/designs/rapidus2hp/cva6/constraint_0.3_6T.sdc
rename to flow/designs/rapidus2hp/cva6/constraint_0.3s_6T.sdc
diff --git a/flow/designs/rapidus2hp/cva6/constraint_0.3_8T.sdc b/flow/designs/rapidus2hp/cva6/constraint_0.3s_8T.sdc
similarity index 100%
rename from flow/designs/rapidus2hp/cva6/constraint_0.3_8T.sdc
rename to flow/designs/rapidus2hp/cva6/constraint_0.3s_8T.sdc
diff --git a/flow/designs/rapidus2hp/cva6/test/test_params.py b/flow/designs/rapidus2hp/cva6/test/test_params.py
index 74639da262..4f0f353ba1 100755
--- a/flow/designs/rapidus2hp/cva6/test/test_params.py
+++ b/flow/designs/rapidus2hp/cva6/test/test_params.py
@@ -24,9 +24,9 @@ def setUp(self):
     def get_exp_sdc(self, place_site, pdk_version):
         """Returns the expected SDC file path"""
 
-        if pdk_version in ["", "0.2a", "0.3"]:
+        if pdk_version in ["", "0.2a", "0.3s"]:
             if pdk_version == "":
-                pdk_version = "0.3"
+                pdk_version = "0.3s"
             if place_site == "ra02h138_DST_45CPP":
                 return os.path.join(
                     self._design_full_dir, f"constraint_{pdk_version}_6T.sdc"
@@ -41,9 +41,9 @@ def get_exp_sdc(self, place_site, pdk_version):
 
         return os.path.join(self._design_full_dir, "constraint.sdc")
 
-    def test_pdk_0p3_default(self):
+    def test_pdk_0p3s_default(self):
         """
-        Tests PDK 0.3
+        Tests PDK 0.3s
         """
 
         pdk_version = ""
@@ -109,12 +109,12 @@ def test_pdk_0p15(self):
                     front_end=front_end,
                 )
 
-    def test_pdk_0p3(self):
+    def test_pdk_0p3s(self):
         """
-        Tests PDK 0.3
+        Tests PDK 0.3s
         """
 
-        pdk_version = "0.3"
+        pdk_version = "0.3s"
         for front_end in self._front_end_list:
             for place_site in self._synopsys_site_list:
                 exp_sdc = self.get_exp_sdc(place_site, pdk_version)
diff --git a/flow/designs/rapidus2hp/ethmac/config.mk b/flow/designs/rapidus2hp/ethmac/config.mk
index a0491869dc..fe625b996e 100644
--- a/flow/designs/rapidus2hp/ethmac/config.mk
+++ b/flow/designs/rapidus2hp/ethmac/config.mk
@@ -17,7 +17,7 @@ export CORE_UTILIZATION = $(strip \
 	$(if $(filter ra02h138_DST_45CPP,$(PLACE_SITE)), \
 		63, \
 		65), \
-        $(if $(filter 0.3,$(RAPIDUS_PDK_VERSION)), \
+        $(if $(filter 0.3s,$(RAPIDUS_PDK_VERSION)), \
 	    65, \
             70) \
     ))
diff --git a/flow/designs/rapidus2hp/ethmac/test/test_params.py b/flow/designs/rapidus2hp/ethmac/test/test_params.py
index 2c3ed37ef2..c5480e72ab 100755
--- a/flow/designs/rapidus2hp/ethmac/test/test_params.py
+++ b/flow/designs/rapidus2hp/ethmac/test/test_params.py
@@ -28,12 +28,12 @@ def get_exp_util(self, place_site, pdk_version):
             if place_site == "ra02h138_DST_45CPP":
                 return 63
             return 65
-        if pdk_version in ["", "0.3"]:
+        if pdk_version in ["", "0.3s"]:
             return 65
         return 70
 
-    def test_pdk_0p3_default(self):
-        """Tests PDK 0.3 Utilization"""
+    def test_pdk_0p3s_default(self):
+        """Tests PDK 0.3s Utilization"""
 
         pdk_version = ""
         for front_end in self._front_end_list:
@@ -92,10 +92,10 @@ def test_pdk_0p15(self):
                     front_end=front_end,
                 )
 
-    def test_pdk_0p3(self):
-        """Tests PDK 0.3 Utilization"""
+    def test_pdk_0p3s(self):
+        """Tests PDK 0.3s Utilization"""
 
-        pdk_version = "0.3"
+        pdk_version = "0.3s"
         for front_end in self._front_end_list:
             for place_site in self._synopsys_site_list:
                 exp_util = self.get_exp_util(place_site, pdk_version)
diff --git a/flow/designs/rapidus2hp/gcd/test/test_params.py b/flow/designs/rapidus2hp/gcd/test/test_params.py
index dfe28307b0..91de2b7063 100755
--- a/flow/designs/rapidus2hp/gcd/test/test_params.py
+++ b/flow/designs/rapidus2hp/gcd/test/test_params.py
@@ -32,9 +32,9 @@ def get_exp_util(self, place_site, pdk_version):
             return 43
         return 45
 
-    def test_pdk_0p3_default(self):
+    def test_pdk_0p3s_default(self):
         """
-        Tests PDK 0.3 utilization
+        Tests PDK 0.3s utilization
         """
 
         pdk_version = ""
@@ -100,12 +100,12 @@ def test_pdk_0p15(self):
                     front_end=front_end,
                 )
 
-    def test_pdk_0p3(self):
+    def test_pdk_0p3s(self):
         """
-        Tests PDK 0.3 utilization
+        Tests PDK 0.3s utilization
         """
 
-        pdk_version = "0.3"
+        pdk_version = "0.3s"
         for front_end in self._front_end_list:
             for place_site in self._synopsys_site_list:
                 exp_util = self.get_exp_util(place_site, pdk_version)
diff --git a/flow/designs/rapidus2hp/hercules_idecode/test/test_params.py b/flow/designs/rapidus2hp/hercules_idecode/test/test_params.py
index 6df51087ca..94a15fae3a 100755
--- a/flow/designs/rapidus2hp/hercules_idecode/test/test_params.py
+++ b/flow/designs/rapidus2hp/hercules_idecode/test/test_params.py
@@ -35,9 +35,9 @@ def get_exp_util(self, place_site, pdk_version, front_end):
                 return 44
             return 50
 
-    def test_pdk_0p3_default(self):
+    def test_pdk_0p3s_default(self):
         """
-        Tests PDK 0.3 utilization
+        Tests PDK 0.3s utilization
         """
 
         pdk_version = ""
@@ -103,12 +103,12 @@ def test_pdk_0p15(self):
                     front_end=front_end,
                 )
 
-    def test_pdk_0p3(self):
+    def test_pdk_0p3s(self):
         """
-        Tests PDK 0.3 utilization
+        Tests PDK 0.3s utilization
         """
 
-        pdk_version = "0.3"
+        pdk_version = "0.3s"
         for front_end in self._front_end_list:
             for place_site in self._synopsys_site_list:
                 exp_util = self.get_exp_util(place_site, pdk_version, front_end)
diff --git a/flow/designs/rapidus2hp/hercules_is_int/config.mk b/flow/designs/rapidus2hp/hercules_is_int/config.mk
index 4e207a8168..ba4b8e7117 100644
--- a/flow/designs/rapidus2hp/hercules_is_int/config.mk
+++ b/flow/designs/rapidus2hp/hercules_is_int/config.mk
@@ -28,7 +28,7 @@ export SYNTH_HIERARCHICAL    ?= 0
 
 # Use $(if) to defer conditional eval until all makefiles are read
 export CORE_UTILIZATION = $(strip \
-    $(if $(filter 0.3,$(RAPIDUS_PDK_VERSION)), \
+    $(if $(filter 0.3s,$(RAPIDUS_PDK_VERSION)), \
         $(if $(filter ra02h138_DST_45CPP,$(PLACE_SITE)), \
             $(if $(filter slang,$(SYNTH_HDL_FRONTEND)), \
                 $(if $(filter 14LM,$(LAYER_STACK_OPTION)), \
diff --git a/flow/designs/rapidus2hp/hercules_is_int/test/test_params.py b/flow/designs/rapidus2hp/hercules_is_int/test/test_params.py
index 54422f0940..078f18ed83 100755
--- a/flow/designs/rapidus2hp/hercules_is_int/test/test_params.py
+++ b/flow/designs/rapidus2hp/hercules_is_int/test/test_params.py
@@ -24,7 +24,7 @@ def setUp(self):
     def get_exp_util(self, place_site, front_end, pdk_version, layer_stack):
         """Returns the expected value"""
 
-        if pdk_version in ["", "0.3"]:
+        if pdk_version in ["", "0.3s"]:
             if place_site == "ra02h138_DST_45CPP":
                 if front_end in ["", "slang"]:
                     if layer_stack == "14LM":
@@ -48,9 +48,9 @@ def get_exp_util(self, place_site, front_end, pdk_version, layer_stack):
                 return 30
             return 52
 
-    def test_pdk_0p3_default(self):
+    def test_pdk_0p3s_default(self):
         """
-        Tests PDK 0.3 utilization
+        Tests PDK 0.3s utilization
         """
 
         pdk_version = ""
@@ -131,12 +131,12 @@ def test_pdk_0p15(self):
                         layer_stack=layer_stack,
                     )
 
-    def test_pdk_0p3(self):
+    def test_pdk_0p3s(self):
         """
-        Tests PDK 0.3 utilization
+        Tests PDK 0.3s utilization
         """
 
-        pdk_version = "0.3"
+        pdk_version = "0.3s"
         for front_end in self._front_end_list:
             for place_site in self._synopsys_site_list:
                 for layer_stack in self._layer_stack_list:
diff --git a/flow/designs/rapidus2hp/ibex/config.mk b/flow/designs/rapidus2hp/ibex/config.mk
index 3a1b18e49e..b7c506bb99 100644
--- a/flow/designs/rapidus2hp/ibex/config.mk
+++ b/flow/designs/rapidus2hp/ibex/config.mk
@@ -23,28 +23,28 @@ export SYNTH_HDL_FRONTEND ?= slang
 ifeq ($(FLOW_VARIANT),pos_slack)
 export SDC_FILE              = $(DESIGN_HOME)/$(PLATFORM)/$(DESIGN_NICKNAME)/constraint_pos_slack.sdc
 else
-  DEFAULT_SDC_FILE = $(DESIGN_HOME)/$(PLATFORM)/$(DESIGN_NICKNAME)/constraint.sdc
-  _0P2A_6T_SDC_FILE = $(DESIGN_HOME)/$(PLATFORM)/$(DESIGN_NICKNAME)/constraint_0.2a_6T.sdc
-  _0P2A_8T_SDC_FILE = $(DESIGN_HOME)/$(PLATFORM)/$(DESIGN_NICKNAME)/constraint_0.2a_8T.sdc
-  _0P15_SDC_FILE = $(DESIGN_HOME)/$(PLATFORM)/$(DESIGN_NICKNAME)/constraint_0.15.sdc
-  _0P3_6T_SDC_FILE = $(DESIGN_HOME)/$(PLATFORM)/$(DESIGN_NICKNAME)/constraint_0.3_6T.sdc
-  _0P3_8T_SDC_FILE = $(DESIGN_HOME)/$(PLATFORM)/$(DESIGN_NICKNAME)/constraint_0.3_8T.sdc
+  .DEFAULT_SDC_FILE = $(DESIGN_HOME)/$(PLATFORM)/$(DESIGN_NICKNAME)/constraint.sdc
+  ._0P2A_6T_SDC_FILE = $(DESIGN_HOME)/$(PLATFORM)/$(DESIGN_NICKNAME)/constraint_0.2a_6T.sdc
+  ._0P2A_8T_SDC_FILE = $(DESIGN_HOME)/$(PLATFORM)/$(DESIGN_NICKNAME)/constraint_0.2a_8T.sdc
+  ._0P15_SDC_FILE = $(DESIGN_HOME)/$(PLATFORM)/$(DESIGN_NICKNAME)/constraint_0.15.sdc
+  ._0P3S_6T_SDC_FILE = $(DESIGN_HOME)/$(PLATFORM)/$(DESIGN_NICKNAME)/constraint_0.3s_6T.sdc
+  ._0P3S_8T_SDC_FILE = $(DESIGN_HOME)/$(PLATFORM)/$(DESIGN_NICKNAME)/constraint_0.3s_8T.sdc
 
   # Use $(if) to defer conditional eval until all makefiles are read
   export SDC_FILE = $(strip \
     $(if $(filter 0.2a,$(RAPIDUS_PDK_VERSION)), \
 	$(if $(filter ra02h138_DST_45CPP,$(PLACE_SITE)), \
-	    $(_0P2A_6T_SDC_FILE), \
-	    $(_0P2A_8T_SDC_FILE) \
+	    $(._0P2A_6T_SDC_FILE), \
+	    $(._0P2A_8T_SDC_FILE) \
         ), \
         $(if $(filter 0.15,$(RAPIDUS_PDK_VERSION)), \
-            $(_0P15_SDC_FILE), \
-            $(if $(filter 0.3,$(RAPIDUS_PDK_VERSION)), \
+            $(._0P15_SDC_FILE), \
+            $(if $(filter 0.3s,$(RAPIDUS_PDK_VERSION)), \
 	        $(if $(filter ra02h138_DST_45CPP,$(PLACE_SITE)), \
-	            $(_0P3_6T_SDC_FILE), \
-	            $(_0P3_8T_SDC_FILE) \
+	            $(._0P3S_6T_SDC_FILE), \
+	            $(._0P3S_8T_SDC_FILE) \
                 ), \
-                $(DEFAULT_SDC_FILE) \
+                $(.DEFAULT_SDC_FILE) \
             ) \
         ) \
     ))
@@ -56,7 +56,7 @@ export CORE_UTILIZATION = $(strip \
 	    52, \
 	    65 \
         ), \
-        $(if $(filter 0.3,$(RAPIDUS_PDK_VERSION)), \
+        $(if $(filter 0.3s,$(RAPIDUS_PDK_VERSION)), \
             $(if $(filter ra02h138_DST_45CPP,$(PLACE_SITE)), \
 		60, \
 		65 \
diff --git a/flow/designs/rapidus2hp/ibex/constraint_0.3_6T.sdc b/flow/designs/rapidus2hp/ibex/constraint_0.3s_6T.sdc
similarity index 100%
rename from flow/designs/rapidus2hp/ibex/constraint_0.3_6T.sdc
rename to flow/designs/rapidus2hp/ibex/constraint_0.3s_6T.sdc
diff --git a/flow/designs/rapidus2hp/ibex/constraint_0.3_8T.sdc b/flow/designs/rapidus2hp/ibex/constraint_0.3s_8T.sdc
similarity index 100%
rename from flow/designs/rapidus2hp/ibex/constraint_0.3_8T.sdc
rename to flow/designs/rapidus2hp/ibex/constraint_0.3s_8T.sdc
diff --git a/flow/designs/rapidus2hp/ibex/test/test_params.py b/flow/designs/rapidus2hp/ibex/test/test_params.py
index 9953c62ccd..3eba7f7f17 100755
--- a/flow/designs/rapidus2hp/ibex/test/test_params.py
+++ b/flow/designs/rapidus2hp/ibex/test/test_params.py
@@ -24,7 +24,7 @@ def setUp(self):
     def get_exp_util(self, place_site, pdk_version):
         """Returns the expected utilization"""
 
-        if pdk_version in ["", "0.3"]:
+        if pdk_version in ["", "0.3s"]:
             if place_site == "ra02h138_DST_45CPP":
                 return 60
             return 65
@@ -47,9 +47,9 @@ def get_exp_sdc(self, place_site, pdk_version):
             )
         if pdk_version == "0.15":
             return os.path.join(self._design_full_dir, f"constraint_{pdk_version}.sdc")
-        if pdk_version in ["", "0.3"]:
+        if pdk_version in ["", "0.3s"]:
             if pdk_version == "":
-                pdk_version = "0.3"
+                pdk_version = "0.3s"
             if place_site == "ra02h138_DST_45CPP":
                 return os.path.join(
                     self._design_full_dir, f"constraint_{pdk_version}_6T.sdc"
@@ -60,9 +60,9 @@ def get_exp_sdc(self, place_site, pdk_version):
 
         return os.path.join(self._design_full_dir, "constraint.sdc")
 
-    def test_pdk_0p3_default(self):
+    def test_pdk_0p3s_default(self):
         """
-        Tests PDK 0.3 utilization
+        Tests PDK 0.3s utilization
         """
 
         pdk_version = ""
@@ -160,13 +160,13 @@ def test_pdk_0p15(self):
                     front_end=front_end,
                 )
 
-    def test_pdk_0p3(self):
+    def test_pdk_0p3s(self):
         """
-        Tests PDK 0.3 utilization
+        Tests PDK 0.3s utilization
         """
 
         front_end = ""
-        pdk_version = "0.3"
+        pdk_version = "0.3s"
         for front_end in self._front_end_list:
             for place_site in self._synopsys_site_list:
                 exp_util = self.get_exp_util(place_site, pdk_version)
diff --git a/flow/designs/rapidus2hp/jpeg/config.mk b/flow/designs/rapidus2hp/jpeg/config.mk
index a41d2bcecc..f328b7b4b8 100644
--- a/flow/designs/rapidus2hp/jpeg/config.mk
+++ b/flow/designs/rapidus2hp/jpeg/config.mk
@@ -10,24 +10,24 @@ endif
 export VERILOG_FILES          = $(sort $(wildcard $(DESIGN_HOME)/src/$(DESIGN_NICKNAME)/*.v))
 export VERILOG_INCLUDE_DIRS   = $(DESIGN_HOME)/src/$(DESIGN_NICKNAME)/include
 
-DEFAULT_SDC_FILE  = $(DESIGN_HOME)/$(PLATFORM)/$(DESIGN_NICKNAME)/jpeg_encoder15_7nm.sdc
-_0P2A_8T_SDC_FILE = $(DESIGN_HOME)/$(PLATFORM)/$(DESIGN_NICKNAME)/jpeg_encoder15_0.2a_8T.sdc
-_0P15_6T_SDC_FILE = $(DESIGN_HOME)/$(PLATFORM)/$(DESIGN_NICKNAME)/jpeg_encoder15_0.15_6T.sdc
-_0P15_8T_SDC_FILE = $(DESIGN_HOME)/$(PLATFORM)/$(DESIGN_NICKNAME)/jpeg_encoder15_0.15_8T.sdc
-_0P3_SDC_FILE     = $(DESIGN_HOME)/$(PLATFORM)/$(DESIGN_NICKNAME)/jpeg_encoder15_0.3.sdc
+.DEFAULT_SDC_FILE  = $(DESIGN_HOME)/$(PLATFORM)/$(DESIGN_NICKNAME)/jpeg_encoder15_7nm.sdc
+._0P2A_8T_SDC_FILE = $(DESIGN_HOME)/$(PLATFORM)/$(DESIGN_NICKNAME)/jpeg_encoder15_0.2a_8T.sdc
+._0P15_6T_SDC_FILE = $(DESIGN_HOME)/$(PLATFORM)/$(DESIGN_NICKNAME)/jpeg_encoder15_0.15_6T.sdc
+._0P15_8T_SDC_FILE = $(DESIGN_HOME)/$(PLATFORM)/$(DESIGN_NICKNAME)/jpeg_encoder15_0.15_8T.sdc
+._0P3S_SDC_FILE     = $(DESIGN_HOME)/$(PLATFORM)/$(DESIGN_NICKNAME)/jpeg_encoder15_0.3s.sdc
 
 # Use $(if) to defer conditional eval until all makefiles are read
 export SDC_FILE = $(strip \
     $(if $(and $(filter 0.2a,$(RAPIDUS_PDK_VERSION)),$(filter ra02h184_HST_45CPP,$(PLACE_SITE))), \
-        $(_0P2A_8T_SDC_FILE), \
+        $(._0P2A_8T_SDC_FILE), \
         $(if $(filter 0.15,$(RAPIDUS_PDK_VERSION)), \
             $(if $(filter ra02h138_DST_45CPP,$(PLACE_SITE)), \
-                $(_0P15_6T_SDC_FILE), \
-                $(_0P15_8T_SDC_FILE) \
+                $(._0P15_6T_SDC_FILE), \
+                $(._0P15_8T_SDC_FILE) \
             ), \
-            $(if $(filter 0.3,$(RAPIDUS_PDK_VERSION)), \
-                $(_0P3_SDC_FILE), \
-                $(DEFAULT_SDC_FILE) \
+            $(if $(filter 0.3s,$(RAPIDUS_PDK_VERSION)), \
+                $(._0P3S_SDC_FILE), \
+                $(.DEFAULT_SDC_FILE) \
             ) \
         ) \
     ))
diff --git a/flow/designs/rapidus2hp/jpeg/jpeg_encoder15_0.3.sdc b/flow/designs/rapidus2hp/jpeg/jpeg_encoder15_0.3s.sdc
similarity index 100%
rename from flow/designs/rapidus2hp/jpeg/jpeg_encoder15_0.3.sdc
rename to flow/designs/rapidus2hp/jpeg/jpeg_encoder15_0.3s.sdc
diff --git a/flow/designs/rapidus2hp/jpeg/test/test_params.py b/flow/designs/rapidus2hp/jpeg/test/test_params.py
index b04eed5eab..e964bb9f25 100755
--- a/flow/designs/rapidus2hp/jpeg/test/test_params.py
+++ b/flow/designs/rapidus2hp/jpeg/test/test_params.py
@@ -37,17 +37,17 @@ def get_exp_sdc(self, place_site, pdk_version):
             return os.path.join(
                 self._design_full_dir, f"jpeg_encoder15_{pdk_version}_6T.sdc"
             )
-        if pdk_version in ["", "0.3"]:
+        if pdk_version in ["", "0.3s"]:
             if pdk_version == "":
-                pdk_version = "0.3"
+                pdk_version = "0.3s"
             return os.path.join(
                 self._design_full_dir, f"jpeg_encoder15_{pdk_version}.sdc"
             )
         return os.path.join(self._design_full_dir, "jpeg_encoder15_7nm.sdc")
 
-    def test_pdk_0p3_default(self):
+    def test_pdk_0p3s_default(self):
         """
-        Tests PDK 0.3 utilization
+        Tests PDK 0.3s utilization
         """
 
         pdk_version = ""
@@ -113,12 +113,12 @@ def test_pdk_0p15(self):
                     front_end=front_end,
                 )
 
-    def test_pdk_0p3(self):
+    def test_pdk_0p3s(self):
         """
-        Tests PDK 0.3 utilization
+        Tests PDK 0.3s utilization
         """
 
-        pdk_version = "0.3"
+        pdk_version = "0.3s"
         for front_end in self._front_end_list:
             for place_site in self._synopsys_site_list:
                 exp_sdc = self.get_exp_sdc(place_site, pdk_version)