diff --git a/src/main/scala/def/def.scala b/src/main/scala/def/def.scala
deleted file mode 100644
index e69de29..0000000
diff --git a/src/main/scala/mac/WithMac.scala b/src/main/scala/mac/WithMac.scala
new file mode 100644
index 0000000..bd117df
--- /dev/null
+++ b/src/main/scala/mac/WithMac.scala
@@ -0,0 +1,19 @@
+package MAC
+
+import chisel3._
+import org.chipsalliance.cde.config.Field
+import freechips.rocketchip.subsystem.BaseSubsystem
+import freechips.rocketchip.diplomacy.{LazyModule,BufferParams}
+import freechips.rocketchip.tilelink.{TLBuffer, TLIdentityNode, TLWidthWidget, TLFragmenter}
+
+
+trait WithManyMacMix { this: BaseSubsystem =>
+
+    val mac = LazyModule(new Mac)
+
+    fbus.coupleFrom("mac_mst") { _ := TLBuffer() := mac.tlClientNode }
+    pbus.coupleTo("mac_cfg") { mac.tlMasterNode := TLFragmenter(4, pbus.blockBytes) := TLWidthWidget(pbus.beatBytes) := _ }
+
+    ibus.fromSync := mac.int_node
+
+}
\ No newline at end of file