Fmax No! Fmax can affect the logic placement but this path have two different clock, Max+ Plus l can not do any timing prediction on this path ogic Option No! Logic Option only affect the Logic Synthesis, not placement of the logic cell Clique Possible Solution! Clique can affect the logic placement but we must exactly knows what we are doing before Clique can help Copyright 1997 Altera Corporation 2/22/2021P11 favara
Copyright © 1997 Altera Corporation 2/22/2021 P.11 – Fmax ? • NO! Fmax can affect the logic placement but this path have two different clock, Max+Plus II can not do any timing prediction on this path – Logic Option ? • NO! Logic Option only affect the Logic Synthesis, not placement of the logic cell – Clique ? • Possible Solution! Clique can affect the logic placement but we must exactly knows what we are doing before Clique can help
Closer lock of what we want DFF F ? F F clk1 CLRN CLRN clk2 a In order to make sure that B can sample the signal from A, What kind of information needs Tco time from register A (Tco) trace delay(+ logic delay) between A and B (Td) Tsu time of register B(Tsu) clock rising edge DIFFERENT BETWEEN 1 and clk2 (X Copyright 1997 Altera Corporation 2/22/2021P12 favara
Copyright © 1997 Altera Corporation 2/22/2021 P.12 Closer Lock of what we want ◼ In order to make sure that B can sample the signal from A, what kind of information needs – Tco time from register A (Tco) – trace delay (+ logic delay) between A and B (Td) – Tsu time of register B (Tsu) – clock rising edge DIFFERENT BETWEEN clk1 and clk2 (X) ? A B