def led_blinker_top(clock, reset, leds, buttons):
glbl = Global(clock, reset)
csrbus = Barebone()
dbtns = Signal(buttons.val)
led_inst = led_blinker(glbl, csrbus, leds)
dbn_inst = button_debounce(glbl, buttons, dbtns)
btn_inst = button_controller(glbl, csrbus, dbtns)
# above all the components have been added, now build the
# register file (figures out addresses, etc) and then get
# the memory-mapped bus interconnect
csrbus.regfile_build()
bus_inst = csrbus.interconnect()
return myhdl.instances()
