|  ## serial:0.tx | 
 | set_property LOC D10 [get_ports serial_tx] | 
 | set_property IOSTANDARD LVCMOS33 [get_ports serial_tx] | 
 |  ## serial:0.rx | 
 | set_property LOC A9 [get_ports serial_rx] | 
 | set_property IOSTANDARD LVCMOS33 [get_ports serial_rx] | 
 |  ## cpu_reset:0 | 
 | set_property LOC C2 [get_ports cpu_reset] | 
 | set_property IOSTANDARD LVCMOS33 [get_ports cpu_reset] | 
 |  ## clk100:0 | 
 | set_property LOC E3 [get_ports clk100] | 
 | set_property IOSTANDARD LVCMOS33 [get_ports clk100] | 
 |  ## eth_ref_clk:0 | 
 | set_property LOC G18 [get_ports eth_ref_clk] | 
 | set_property IOSTANDARD LVCMOS33 [get_ports eth_ref_clk] | 
 |  | 
 | set_property INTERNAL_VREF 0.675 [get_iobanks 34] | 
 |  | 
 | create_clock -name clk100 -period 10.0 [get_nets clk100] | 
 |  | 
 | set_false_path -quiet -to [get_nets -quiet -filter {mr_ff == TRUE}] | 
 |  | 
 | set_false_path -quiet -to [get_pins -quiet -filter {REF_PIN_NAME == PRE} -of [get_cells -quiet -filter {ars_ff1 == TRUE || ars_ff2 == TRUE}]] | 
 |  | 
 | set_max_delay 2 -quiet -from [get_pins -quiet -filter {REF_PIN_NAME == Q} -of [get_cells -quiet -filter {ars_ff1 == TRUE}]] -to [get_pins -quiet -filter {REF_PIN_NAME == D} -of [get_cells -quiet -filter {ars_ff2 == TRUE}]] |