diff --git a/.justfile b/.justfile
index 5ab236d..1d28a67 100644
--- a/.justfile
+++ b/.justfile
@@ -55,6 +55,10 @@ cam-test-all:
 cam-test-full:
     just remote "make -C hw/sim clean && make -C hw/sim test-all"
 
+# Run top CAM tests
+cam-test-top:
+    just remote "make -C hw/sim clean && make -C hw/sim test-top"
+
 # Run Python reference model tests
 cam-test-py:
     make -C hw/sim test-model
diff --git a/hw/.gitignore b/hw/.gitignore
index 179b494..72bc0bc 100644
--- a/hw/.gitignore
+++ b/hw/.gitignore
@@ -1,2 +1,3 @@
-sim/sim_build
-sim/results.xml
+**/sim_build/
+**/results.xml
+*.fst
diff --git a/hw/rtl/cam_top.sv b/hw/rtl/cam_top.sv
index c195c0b..3002b5d 100644
--- a/hw/rtl/cam_top.sv
+++ b/hw/rtl/cam_top.sv
@@ -7,7 +7,7 @@ module cam_top #(
     parameter int           WRITE_NOISE_RATE_DEN = 100,
     parameter int           WRITE_NOISE_BITS     = 8,
     parameter logic [63:0]  WRITE_NOISE_SEED     = 64'hB504_F32D_B504_F32D,
-    parameter bit           READ_NOISE_EN        = 1'b0,
+    parameter bit           READ_NOISE_EN        = 1'b1,
     parameter int           READ_NOISE_RATE_NUM  = 1,
     parameter int           READ_NOISE_RATE_DEN  = 100,
     parameter int           READ_NOISE_BITS      = 8,
diff --git a/hw/sim/Makefile b/hw/sim/Makefile
index 7117b5b..656e588 100644
--- a/hw/sim/Makefile
+++ b/hw/sim/Makefile
@@ -1,3 +1,4 @@
+PYTHON ?= python
 MODULE_TESTS := cam_core_banked match_engine_pipeline cam_write_noise cam_read_noise
 
 .PHONY: help test-all test-top test-modules test-module test-model test-perf clean $(MODULE_TESTS:%=test-module-%)
@@ -27,7 +28,7 @@ $(MODULE_TESTS:%=test-module-%):
 	$(MAKE) -C tests/modules/$(@:test-module-%=%)
 
 test-model:
-	uv run pytest tests/model -q
+	env -u PYTHONPATH -u PYTHONHOME $(PYTHON) -m pytest tests/model -q
 
 test-perf:
 	$(MAKE) -C tests/perf
diff --git a/hw/sim/mk/cocotb-common.mk b/hw/sim/mk/cocotb-common.mk
index 29f8003..dafcfc8 100644
--- a/hw/sim/mk/cocotb-common.mk
+++ b/hw/sim/mk/cocotb-common.mk
@@ -37,10 +37,10 @@ WRITE_NOISE_EN          ?= $(NOISE_EN)
 WRITE_NOISE_RATE_NUM    ?= $(NOISE_RATE_NUM)
 WRITE_NOISE_RATE_DEN    ?= $(NOISE_RATE_DEN)
 WRITE_NOISE_BITS        ?= $(NOISE_BITS)
-READ_NOISE_EN           ?=
-READ_NOISE_RATE_NUM     ?=
-READ_NOISE_RATE_DEN     ?=
-READ_NOISE_BITS         ?=
+READ_NOISE_EN           ?= $(NOISE_EN)
+READ_NOISE_RATE_NUM     ?= $(NOISE_RATE_NUM)
+READ_NOISE_RATE_DEN     ?= $(NOISE_RATE_DEN)
+READ_NOISE_BITS         ?= $(NOISE_BITS)
 
 ifneq ($(strip $(WRITE_NOISE_EN)),)
 COMPILE_ARGS += -GWRITE_NOISE_EN=$(WRITE_NOISE_EN)