diff --git a/Bender.yml b/Bender.yml
index d1330e49..d65b3069 100644
--- a/Bender.yml
+++ b/Bender.yml
@@ -46,6 +46,7 @@ sources:
   - hw/newusb_regs/newusb_reg_pkg.sv
   - hw/newusb_regs/newusb_reg_top.sv
   - hw/newusb/new_usb_ohci_pkg.sv
+  - hw/newusb/new_usb_nonperiodiccounter.sv
   - hw/newusb/new_usb_ohci.sv
   - hw/cheshire_pkg.sv
   - hw/cheshire_soc.sv
diff --git a/hw/newusb/new_usb_nonperiodiccounter.sv b/hw/newusb/new_usb_nonperiodiccounter.sv
index ab448bee..cea813cf 100644
--- a/hw/newusb/new_usb_nonperiodiccounter.sv
+++ b/hw/newusb/new_usb_nonperiodiccounter.sv
@@ -23,6 +23,7 @@ module new_usb_nonperiodiccounter (
 
   logic [1:0] count;
   logic restart_counter;
+  logic en_i;
 
   counter #(.WIDTH(2), .STICKY_OVERFLOW(1'b1)) i_counter (
     .clk_i,
@@ -36,7 +37,7 @@ module new_usb_nonperiodiccounter (
     .overflow_o(counter_overflown_o)
   );
   
-  assign counter_is_threshold_i = (count == 2'b00);
+  assign counter_is_threshold_o = (count == 2'b00);
 
   // create enable, one pulse for one count
   logic served_control_td_prev;
@@ -47,7 +48,7 @@ module new_usb_nonperiodiccounter (
   logic served_bulk_td_prev;
   logic reloadcbsr;
   `FF(served_bulk_td_prev, served_bulk_td_i, 1'b0)
-  restart_counter = served_bulk_td_i && ~served_bulk_td_prev;
-  assign reload_cbsr = (restart_counter || !rst_ni);
+  assign restart_counter = served_bulk_td_i && ~served_bulk_td_prev;
+  assign reload_cbsr = (restart_counter || ~rst_ni);
 
 endmodule
\ No newline at end of file
diff --git a/hw/newusb_tb/tb_new_usb_nonperiodiccounter.sv b/hw/newusb_tb/tb_new_usb_nonperiodiccounter.sv
index 5bd27c95..02347268 100644
--- a/hw/newusb_tb/tb_new_usb_nonperiodiccounter.sv
+++ b/hw/newusb_tb/tb_new_usb_nonperiodiccounter.sv
@@ -34,4 +34,17 @@ initial begin
     rst_ni = 1;
 end
 
+logic overflow;
+logic threshold;
+
+new_usb_nonperiodiccounter i_nonperiodiccounter (
+  .clk_i,
+  .rst_ni,
+  .served_bulk_td_i(1'b0), // successfully served bulk transfer descriptor
+  .served_control_td_i(1'b1), // successfully served control transfer descriptor
+  .cbsr_i(2'b11),
+  .counter_overflown_o(overflow), // enough control EDs served
+  .counter_is_threshold_o(threshold) // signals last control ED to send for listservice
+);
+
 endmodule
diff --git a/target/sim/vsim/start.newusb_nonperiodiccounter.tcl b/target/sim/vsim/start.newusb_nonperiodiccounter.tcl
index 6a240606..15aef572 100755
--- a/target/sim/vsim/start.newusb_nonperiodiccounter.tcl
+++ b/target/sim/vsim/start.newusb_nonperiodiccounter.tcl
@@ -12,5 +12,7 @@ set NumericStdNoWarnings 1
 eval vsim -c ${TESTBENCH} -t 1ps -vopt -voptargs="+acc"
 add wave -position insertpoint sim:/tb_new_usb_nonperiodiccounter/clk_i
 add wave -position insertpoint sim:/tb_new_usb_nonperiodiccounter/rst_ni
+add wave -position insertpoint sim:/tb_new_usb_nonperiodiccounter/overflow
+add wave -position insertpoint sim:/tb_new_usb_nonperiodiccounter/threshold
 
 run 1us
\ No newline at end of file