diff --git a/generators/chipyard/src/main/scala/HarnessBinders.scala b/generators/chipyard/src/main/scala/HarnessBinders.scala
index 02ab3732..588878d5 100644
--- a/generators/chipyard/src/main/scala/HarnessBinders.scala
+++ b/generators/chipyard/src/main/scala/HarnessBinders.scala
@@ -143,7 +143,8 @@ class WithBlackBoxSimMem extends OverrideHarnessBinder({
     (ports zip system.memAXI4Node.edges.in).map { case (port, edge) =>
       val memSize = p(ExtMem).get.master.size
       val lineSize = p(CacheBlockBytes)
-      val mem = Module(new SimDRAM(memSize, lineSize, edge.bundle)).suggestName("simdram")
+      val clockFreq = p(MemoryBusKey).dtsFrequency.get
+      val mem = Module(new SimDRAM(memSize, lineSize, clockFreq, edge.bundle)).suggestName("simdram")
       mem.io.axi <> port.bits
       mem.io.clock := port.clock
       mem.io.reset := port.reset
diff --git a/generators/chipyard/src/main/scala/config/AbstractConfig.scala b/generators/chipyard/src/main/scala/config/AbstractConfig.scala
index 73c2b006..a70ae4df 100644
--- a/generators/chipyard/src/main/scala/config/AbstractConfig.scala
+++ b/generators/chipyard/src/main/scala/config/AbstractConfig.scala
@@ -45,6 +45,8 @@ class AbstractConfig extends Config(
   new chipyard.config.WithNoSubsystemDrivenClocks ++             // drive the subsystem diplomatic clocks from ChipTop instead of using implicit clocks
   new chipyard.config.WithInheritBusFrequencyAssignments ++      // Unspecified clocks within a bus will receive the bus frequency if set
   new chipyard.config.WithPeripheryBusFrequencyAsDefault ++      // Unspecified frequencies with match the pbus frequency (which is always set)
+  new chipyard.config.WithMemoryBusFrequency(100.0) ++           // Default 100 MHz mbus
+  new chipyard.config.WithPeripheryBusFrequency(100.0) ++        // Default 100 MHz pbus
   new freechips.rocketchip.subsystem.WithJtagDTM ++              // set the debug module to expose a JTAG port
   new freechips.rocketchip.subsystem.WithNoMMIOPort ++           // no top-level MMIO master port (overrides default set in rocketchip)
   new freechips.rocketchip.subsystem.WithNoSlavePort ++          // no top-level MMIO slave port (overrides default set in rocketchip)
diff --git a/generators/testchipip b/generators/testchipip
index 6572beb0..f2705592 160000
--- a/generators/testchipip
+++ b/generators/testchipip
@@ -1 +1 @@
-Subproject commit 6572beb03bc6eb0575269eaf4cc960b72b3ddef3
+Subproject commit f27055929a2d4c091bfe10c3b64761e281844a2b