Altera HardCopy II Clock Uncertainty Calculator - Manual (Page 24)

2–10 Altera Corporation
HardCopy II Clock Uncertainty Calculator User Guide
Running the Clock Uncertainty Calculator Flow
Figure 2–10 shows a detailed view of the advanced clock uncertianty
calculator spreadsheet. It is important that the first PLL be an integer
number even if there is no PLL involved in the clock transfer. After
having the clock transfer between the different PLLs, enter the PLL index
with respect to the PLL in the spreadsheet, as shown on
Figure 2–10 .
Figure 2–10. Detailed View of the Advanced Clock Uncertianty Calculator
f
For more examples of how to enter the source clock and destination
clock components, refer to
Appendix A, Clock Transfer Examples .
After you complete all entries for the source and destination clock
components, click the Step 2. Calculate Clock Uncertainty Values
button. All setup and hold clock uncertainty values for the different clock
transfers are displayed in picoseconds.
You now have the all the clock uncertainty values in the
CU_Values_Advanced.txt
file. If you have a previously existing clock
uncertainty value file generated by the advanced clock uncertianty
calculator, the file will be renamed to be CU_Values_Advanced.txt.old.
Figure 2–11. HardCopy II Advanced Clock Uncertainty Calculator with Calculation
1st PLL 2nd PLL 1st PLL 2nd PLL Setup (ps) Hold (ps) Setup (ps) Hold (ps) Setup (ps) Hold (ps)
1 0 0 200 50 350 350 180 180
2 4 4 100 50 N/A N/A N/A N/A
3 0 4 N/A N/A 320 290 150 120
4 11 0 N/A N/A 270 330 100 150
5 10 11 N/A N/A 300 200 N/A N/A
Enter User's Notes
(Optional)
Step 3. Read Clock Uncertainty Values
Messages Transfer Source Clock Destination Clock Intra-clock Inter-Clock IO Transfer
Step 1. Enter PLL Information
Ste p 2. Ca lcula te Clo ck
U nce rta inty Va lue s
Ste p 2. Ca lcula te Clo c k
Unce rta inty Va lue s
Reset Table Reset Table