diff --git a/Jenkinsfile b/Jenkinsfile
index f7075e8f..bfc8e702 100644
--- a/Jenkinsfile
+++ b/Jenkinsfile
@@ -1,6 +1,6 @@
 // This file relates to internal XMOS infrastructure and should be ignored by external users
 
-@Library('xmos_jenkins_shared_library@v0.49.0') _
+@Library('xmos_jenkins_shared_library@v0.52.0') _
 
 getApproval()
 pipeline {
@@ -169,6 +169,8 @@ pipeline {
                       // This ensures a project for XS2 can be built and runs OK
                       sh "xsim test_xs2_benign/bin/xs2.xe"
 
+                      sh "xrun -l"
+
                       // Run this first to ensure the XTAG is up and running for subsequent tests
                       timeout(time: 2, unit: 'MINUTES') {
                         sh "xrun --xscope --id 0 unit/bin/tests-unit.xe"
diff --git a/lib_mic_array/api/mic_array/cpp/PdmRx.hpp b/lib_mic_array/api/mic_array/cpp/PdmRx.hpp
index a95ffdce..8408f2c7 100644
--- a/lib_mic_array/api/mic_array/cpp/PdmRx.hpp
+++ b/lib_mic_array/api/mic_array/cpp/PdmRx.hpp
@@ -473,6 +473,41 @@ void mic_array::StandardPdmRxService<CHANNELS_IN, CHANNELS_OUT>::SetPort(port_t
 template <unsigned CHANNELS_IN, unsigned CHANNELS_OUT>
 void mic_array::StandardPdmRxService<CHANNELS_IN, CHANNELS_OUT>::ThreadEntry()
 {
+
+  // The boot pattern is interleaved silence on each channel, so 0101.. for 1 mic
+  // 00110011 for 2 mics etc. After deinterleaving, each channel ends up with the
+  // 0x55555555 (0101..) silence pattern. The pre-deinterleave pattern is
+  // CHANNELS_IN zeros followed by CHANNELS_IN ones, repeated.
+  uint32_t boot_pattern = (CHANNELS_IN == 1)  ? 0x55555555 :
+                          (CHANNELS_IN == 2)  ? 0x33333333 :
+                          (CHANNELS_IN == 4)  ? 0x0F0F0F0F :
+                          (CHANNELS_IN == 8)  ? 0x00FF00FF :
+                                                0x0000FFFF; // 16 mics
+
+  uint32_t good_frames = 0;
+  while(1){
+    // During boot, the PDM port may read all 0s or all 1s.
+    // Output 0x55 (zero) to the buffer until we get a valid frame.
+    uint32_t data = port_in(this->p_pdm_mics);
+    this->blocks[0][--phase] =  boot_pattern;
+
+    if(!phase){
+      this->phase = this->num_phases;
+      uint32_t* ready_block = this->blocks[0];
+      this->blocks[0] = this->blocks[1];
+      this->blocks[1] = ready_block;
+
+      s_chan_out_word(this->c_pdm_blocks.end_a, reinterpret_cast<uint32_t>(ready_block));
+    }
+    // During boot the pin can toggle between all-0s and all-1s, so wait for a
+    // couple of consecutive valid frames before using the data
+    bool bad_frame = (data == 0x00000000) || (data == 0xFFFFFFFF);
+    good_frames = bad_frame ? 0 : (good_frames + 1);
+    if (good_frames > 1) {
+      break;
+    }
+  }
+
   while(1){
     this->blocks[0][--phase] =  port_in(this->p_pdm_mics);
 
diff --git a/python/mic_array/filters.py b/python/mic_array/filters.py
index 20f1f3cc..55f152c5 100644
--- a/python/mic_array/filters.py
+++ b/python/mic_array/filters.py
@@ -78,6 +78,30 @@ def _pad_input(self, sig_in):
     S[:,P:] = sig_in
     return S
 
+  def boot_logic(self, pdm_signal: np.ndarray) -> np.ndarray:
+    # Simulate the PdmRx thread boot loop (StandardPdmRxService::ThreadEntry,
+    # PdmRx.hpp): words are received one at a time; 0x55555555 is written to
+    # the buffer (discarding real data) until good_frames > 1, i.e. 2
+    # consecutive words that are neither all-0 nor all-1
+
+    good_frames = 0
+
+    for start in range(0, pdm_signal.shape[1], 32):
+      if np.all(pdm_signal[:,start:start+32] == 1) or np.all(pdm_signal[:,start:start+32] == -1):
+        good_frames = 0
+        pdm_signal[:,start:start+32] = np.tile([-1, 1], 16).T  # write 0x55555555 to buffer
+        continue
+
+      # signal gets modified either way
+      pdm_signal[:,start:start+32] = np.tile([-1, 1], 16).T  # write 0x55555555 to buffer
+
+      good_frames += 1
+      if good_frames > 1:
+        break
+
+    return pdm_signal
+
+
   def FilterInt16(self, pdm_signal: np.ndarray) -> np.ndarray:
     if pdm_signal.ndim == 1:
       pdm_signal = pdm_signal[np.newaxis,:]
@@ -85,6 +109,8 @@ def FilterInt16(self, pdm_signal: np.ndarray) -> np.ndarray:
     Q = self.DecimationFactor
     N_pcm = SAMPS_IN // self.DecimationFactor
 
+    pdm_signal = self.boot_logic(pdm_signal)
+
     S = self._pad_input(pdm_signal)
     coefs = self.Coef.astype(np.int32)[:,np.newaxis]
     res = np.empty((CHANS, N_pcm), dtype=np.int32)