diff --git a/misoclib/lasmicon/__init__.py b/misoclib/lasmicon/__init__.py
index 60819cc8c..c006207b6 100644
--- a/misoclib/lasmicon/__init__.py
+++ b/misoclib/lasmicon/__init__.py
@@ -7,11 +7,13 @@ from misoclib.lasmicon.refresher import *
 from misoclib.lasmicon.bankmachine import *
 from misoclib.lasmicon.multiplexer import *
 
-PhySettings = namedtuple("PhySettings", "memtype dfi_d nphases rdphase wrphase rdcmdphase wrcmdphase cl read_latency write_latency")
+PhySettingsT = namedtuple("PhySettings", "memtype dfi_d nphases rdphase wrphase rdcmdphase wrcmdphase cl cwl read_latency write_latency")
+def PhySettings(memtype, dfi_d, nphases, rdphase, wrphase, rdcmdphase, wrcmdphase, cl, read_latency, write_latency, cwl=0):
+	return PhySettingsT(memtype, dfi_d, nphases, rdphase, wrphase, rdcmdphase, wrcmdphase, cl, cwl, read_latency, write_latency)
 
-class GeomSettings(namedtuple("_GeomSettings", "bank_a row_a col_a")):
-	def __init__(self, *args, **kwargs):
-		self.mux_a = max(self.row_a, self.col_a)
+GeomSettingsT = namedtuple("_GeomSettings", "bank_a row_a col_a mux_a")
+def GeomSettings(bank_a, row_a, col_a):
+	return GeomSettingsT(bank_a, row_a, col_a, max(row_a, col_a))
 
 TimingSettings = namedtuple("TimingSettings", "tRP tRCD tWR tWTR tREFI tRFC" \
 	" req_queue_size read_time write_time")