diff --git a/specs/sifive.com/MEM/RO/0.1.0/RO_rtl.json5 b/specs/sifive.com/MEM/RO/0.1.0/RO_rtl.json5
new file mode 100644
index 0000000..fc67bfa
--- /dev/null
+++ b/specs/sifive.com/MEM/RO/0.1.0/RO_rtl.json5
@@ -0,0 +1,60 @@
+{
+  abstractionDefinition: {
+    vendor: 'sifive.com',
+    library: 'MEM',
+    name: 'RO_rtl',
+    version: '0.1.0',
+    busType: {
+      vendor: 'sifive.com',
+      library: 'MEM',
+      name: 'RO',
+      version: '0.1.0',
+    },
+    ports: {
+      CLK: {
+        description: 'Memory clock',
+        requiresDriver: true,
+        isClock: true,
+        wire: {
+          onMaster: {width: 1, direction: 'in', presence: 'optional'},
+          onSlave:  {width: 1, direction: 'in', presence: 'optional'}
+        }
+      },
+      RDEN: {
+        description: 'Read enable',
+        wire: {
+          onMaster: {width: 1, direction: 'out', presence: 'required'},
+          onSlave:  {width: 1, direction: 'in', presence: 'required'}
+        }
+      },
+      BEN: {
+        description: 'Byte enable',
+        wire: {
+          onMaster: {width: 'BEN_WIDTH', direction: 'out', presence: 'optional'},
+          onSlave:  {width: 'BEN_WIDTH', direction: 'in', presence: 'optional'}
+        }
+      },
+      ADDR: {
+        description: 'Read / Write port address',
+        wire: {
+          onMaster: {width: 'ADDR_WIDTH', direction: 'out', presence: 'required'},
+          onSlave:  {width: 'ADDR_WIDTH', direction: 'in', presence: 'required'}
+        }
+      },
+      RDDATA: {
+        description: 'Read port data',
+        wire: {
+          onMaster: {width: 'DATA_WIDTH', direction: 'in', presence: 'required'},
+          onSlave:  {width: 'DATA_WIDTH', direction: 'out', presence: 'required'}
+        }
+      },
+      RDERR: {
+        description: 'If ECC feature is present, this signals that an undorrectable error was detected on the read data',
+        wire: {
+          onMaster: {direction: 'in', presence: 'optional'},
+          onSlave:  {direction: 'out', presence: 'optional'}
+        }
+      }
+    }
+  }
+}
diff --git a/specs/sifive.com/MEM/WO/0.1.0/WO_rtl.json5 b/specs/sifive.com/MEM/WO/0.1.0/WO_rtl.json5
new file mode 100644
index 0000000..a867a8a
--- /dev/null
+++ b/specs/sifive.com/MEM/WO/0.1.0/WO_rtl.json5
@@ -0,0 +1,60 @@
+{
+  abstractionDefinition: {
+    vendor: 'sifive.com',
+    library: 'MEM',
+    name: 'WO_rtl',
+    version: '0.1.0',
+    busType: {
+      vendor: 'sifive.com',
+      library: 'MEM',
+      name: 'WO',
+      version: '0.1.0',
+    },
+    ports: {
+      CLK: {
+        description: 'Memory clock',
+        requiresDriver: true,
+        isClock: true,
+        wire: {
+          onMaster: {width: 1, direction: 'in', presence: 'optional'},
+          onSlave:  {width: 1, direction: 'in', presence: 'optional'}
+        }
+      },
+      WREN: {
+        description: 'Write enable',
+        wire: {
+          onMaster: {width: 1, direction: 'out', presence: 'required'},
+          onSlave:  {width: 1, direction: 'in', presence: 'required'}
+        }
+      },
+      BEN: {
+        description: 'Byte enable',
+        wire: {
+          onMaster: {width: 'BEN_WIDTH', direction: 'out', presence: 'optional'},
+          onSlave:  {width: 'BEN_WIDTH', direction: 'in', presence: 'optional'}
+        }
+      },
+      ADDR: {
+        description: 'Read / Write port address',
+        wire: {
+          onMaster: {width: 'ADDR_WIDTH', direction: 'out', presence: 'required'},
+          onSlave:  {width: 'ADDR_WIDTH', direction: 'in', presence: 'required'}
+        }
+      },
+      WRDATA: {
+        description: 'Write port data',
+        wire: {
+          onMaster: {width: 'DATA_WIDTH', direction: 'out', presence: 'required'},
+          onSlave:  {width: 'DATA_WIDTH', direction: 'in', presence: 'required'}
+        }
+      },
+      RDERR: {
+        description: 'If ECC feature is present, this signals that an undorrectable error was detected on the read data',
+        wire: {
+          onMaster: {direction: 'in', presence: 'optional'},
+          onSlave:  {direction: 'out', presence: 'optional'}
+        }
+      }
+    }
+  }
+}