set_multicycle_path questions

[promach]

For multicycle path constraint , what is the difference between the usage of -start and -end ?

Why "hold will return back to 0 cycle check" ?

[NorthGuy]

Use -start to count cycles of the source clock.

Use -end to count cycles of the destination clock.

Doesn't matter if both clocks are the same.

[promach]

Use -start to count cycles of the source clock.

Then the blue arrow in Figure 8 is wrong ?


Besides, how to derive the equation Hold cycles = <setup path multiplier> - 1 - <hold path multiplier> in https://www.xilinx.com/support/documentation/sw_manuals/xilinx2013_1/ug903-vivado-using-constraints.pdf#page=79  ?