1 files changed, 6 insertions, 1 deletions
diff --git a/host/lib/rfnoc/ddc_block_control.cpp b/host/lib/rfnoc/ddc_block_control.cpp
index df606f11b..12e89961d 100644
--- a/host/lib/rfnoc/ddc_block_control.cpp
+++ b/host/lib/rfnoc/ddc_block_control.cpp
@@ -541,10 +541,15 @@ private:
     double _set_freq(
         const double requested_freq, const double dds_rate, const size_t chan)
     {
+        static int freq_word_width = 24;
         double actual_freq;
         int32_t freq_word;
         std::tie(actual_freq, freq_word) =
-            get_freq_and_freq_word(requested_freq, dds_rate);
+            get_freq_and_freq_word(requested_freq, dds_rate, freq_word_width);
+
+        // Only the upper 24 bits of the SR_FREQ_ADDR register are used, so shift the word
+        freq_word <<= (32 - freq_word_width);
+
         _ddc_reg_iface.poke32(
             SR_FREQ_ADDR, uint32_t(freq_word), chan, get_command_time(chan));
         return actual_freq;