How to find out a Tco from TimeQuest

I thought that I can use a min and max of 0 for set_input/output_delay, it just means that I give information about virtual clock and describe outside-of-FPGA clocking scheme, example of that can be seen on page 15-16 of rysc's TimeQuest User Guide (http://www.alteraforum.com/alterawiki.com/uploads/3/3f/timequest_user_guide.pdf).

Here is my whole sdc file (I changed -max and -min from 0 to 1 just for test, it changes nothing, still reported "No setup paths were found.") :

# **************************************************************

# Create Clock

# **************************************************************

create_clock -name {CLK} -period 5.000 -waveform { 0.000 2.500 } [get_ports {CLK}]

create_clock -name {CLK_EXT_output_side} -period 5.000 -waveform { 0.000 2.500 }

create_clock -name {CLK_EXT_input_side} -period 5.000 -waveform { 0.000 2.500 }

# **************************************************************

# Create Generated Clock

# **************************************************************

derive_pll_clocks

# **************************************************************

# Set Input Delay

# **************************************************************

set_input_delay -clock CLK_EXT_input_side -max 1.0 [get_ports din1]

set_input_delay -clock CLK_EXT_input_side -min 1.0 [get_ports din1]

set_input_delay -clock CLK_EXT_input_side -max 1.0 [get_ports din2]

set_input_delay -clock CLK_EXT_input_side -min 1.0 [get_ports din2]

set_input_delay -clock CLK_EXT_input_side -max 1.0 [get_ports din3]

set_input_delay -clock CLK_EXT_input_side -min 1.0 [get_ports din3]

set_input_delay -clock CLK_EXT_input_side -max 1.0 [get_ports din4]

set_input_delay -clock CLK_EXT_input_side -min 1.0 [get_ports din4]

# **************************************************************

# Set Output Delay

# **************************************************************

set_output_delay -clock CLK_EXT_output_side -max 1.0 [get_ports dout1]

set_output_delay -clock CLK_EXT_output_side -min 1.0 [get_ports dout1]

set_output_delay -clock CLK_EXT_output_side -max 1.0 [get_ports dout2]

set_output_delay -clock CLK_EXT_output_side -min 1.0 [get_ports dout2]

set_output_delay -clock CLK_EXT_output_side -max 1.0 [get_ports dout3]

set_output_delay -clock CLK_EXT_output_side -min 1.0 [get_ports dout3]

set_output_delay -clock CLK_EXT_output_side -max 1.0 [get_ports dout4]

set_output_delay -clock CLK_EXT_output_side -min 1.0 [get_ports dout4]