diff --git a/ecp5/arch.cc b/ecp5/arch.cc
index 3aed3ad4..ab24842e 100644
--- a/ecp5/arch.cc
+++ b/ecp5/arch.cc
@@ -1077,12 +1077,10 @@ TimingClockingInfo Arch::getPortClockingInfo(const CellInfo *cell, IdString port
                             ? FALLING_EDGE
                             : RISING_EDGE;
         if (cell->ports.at(port).type == PORT_OUT) {
-            bool is_path = getDelayFromTimingDatabase(id_DP16KD_REGMODE_A_NOREG_REGMODE_B_NOREG, half_clock, port,
-                                                      info.clockToQ);
+            bool is_path = getDelayFromTimingDatabase(cell->ramInfo.regmode_timing_id, half_clock, port, info.clockToQ);
             NPNR_ASSERT(is_path);
         } else {
-            getSetupHoldFromTimingDatabase(id_DP16KD_REGMODE_A_NOREG_REGMODE_B_NOREG, half_clock, port, info.setup,
-                                           info.hold);
+            getSetupHoldFromTimingDatabase(cell->ramInfo.regmode_timing_id, half_clock, port, info.setup, info.hold);
         }
     } else if (cell->type == id_DCUA) {
         std::string prefix = port.str(this).substr(0, 9);
diff --git a/ecp5/archdefs.h b/ecp5/archdefs.h
index b176eec0..0f197345 100644
--- a/ecp5/archdefs.h
+++ b/ecp5/archdefs.h
@@ -180,6 +180,14 @@ struct ArchCellInfo
     struct
     {
         bool is_pdp;
+        // Are the outputs from a DP16KD registered (OUTREG)
+        // or non-registered (NOREG)
+        bool is_output_a_registered;
+        bool is_output_b_registered;
+        // Which timing information to use for a DP16KD. Depends on registering
+        // configuration.
+        nextpnr_ecp5::IdString regmode_timing_id;
+
     } ramInfo;
 };
 
diff --git a/ecp5/pack.cc b/ecp5/pack.cc
index 9c3bb617..0872ae58 100644
--- a/ecp5/pack.cc
+++ b/ecp5/pack.cc
@@ -3014,6 +3014,29 @@ void Arch::assignArchInfo()
                 ci->sliceInfo.has_l6mux = true;
         } else if (ci->type == id_DP16KD) {
             ci->ramInfo.is_pdp = (int_or_default(ci->params, id("DATA_WIDTH_A"), 0) == 36);
+
+            // Output register mode (REGMODE_{A,B}). Valid options are 'NOREG' and 'OUTREG'.
+            std::string regmode_a = str_or_default(ci->params, id("REGMODE_A"), "NOREG");
+            if (regmode_a != "NOREG" && regmode_a != "OUTREG")
+                log_error("DP16KD %s has invalid REGMODE_A configuration '%s'\n", ci->name.c_str(this),
+                          regmode_a.c_str());
+            std::string regmode_b = str_or_default(ci->params, id("REGMODE_B"), "NOREG");
+            if (regmode_b != "NOREG" && regmode_b != "OUTREG")
+                log_error("DP16KD %s has invalid REGMODE_B configuration '%s'\n", ci->name.c_str(this),
+                          regmode_b.c_str());
+            ci->ramInfo.is_output_a_registered = regmode_a == "OUTREG";
+            ci->ramInfo.is_output_b_registered = regmode_b == "OUTREG";
+
+            // Based on the REGMODE, we have different timing lookup tables.
+            if (!ci->ramInfo.is_output_a_registered && !ci->ramInfo.is_output_b_registered) {
+                ci->ramInfo.regmode_timing_id = id_DP16KD_REGMODE_A_NOREG_REGMODE_B_NOREG;
+            } else if (!ci->ramInfo.is_output_a_registered && ci->ramInfo.is_output_b_registered) {
+                ci->ramInfo.regmode_timing_id = id_DP16KD_REGMODE_A_NOREG_REGMODE_B_OUTREG;
+            } else if (ci->ramInfo.is_output_a_registered && !ci->ramInfo.is_output_b_registered) {
+                ci->ramInfo.regmode_timing_id = id_DP16KD_REGMODE_A_OUTREG_REGMODE_B_NOREG;
+            } else if (ci->ramInfo.is_output_a_registered && ci->ramInfo.is_output_b_registered) {
+                ci->ramInfo.regmode_timing_id = id_DP16KD_REGMODE_A_OUTREG_REGMODE_B_OUTREG;
+            }
         }
     }
     for (auto net : sorted(nets)) {