Altera SDC and TimeQuest API - Manual (Page 140)

2–130 Chapter 2: SDC and TimeQuest API Package and Commands
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SDC and TimeQuest API Reference Manual © December 2009 Altera Corporation
The return value of this command is a two-element list. The first number is the number of paths found in
the analysis. The second is the worst-case slack, in terms of the current default time unit.
The "RF" column in the report output uses a two-letter symbol to indicate the rise/fall transition that
occurs at that point in the path.
Possible "RF" values are:
The "Type" column in the report uses a symbol to indicate what type of delay occurs at that point in the
path.
Possible "Type" values are:
Example
project_open my_project
create_timing_netlist
read_sdc
update_timing_netlist
# create max skew constraints
set_max_skew -from [get_ports data_ports[*]] -to [get_keepers *] 0.200
set_max_skew -from [get_keepers *] -to [get_ports output_ports[*]] 0.100
# show worst 10 paths for each earliest and latest arrival results
# per max_skew assignment assuming that their slack is less than 0.100
report_max_skew -panel_name "Report Max Skew" -npaths 10 -less_than_slack \
Value Description
(empty) Unknown transition
R Rising output
F Falling output
RR Rising input, rising output
RF Rising input, falling output
FR Falling input, rising output
FF Falling input, falling output
Value Description
CELL Cell delay
COMP PLL clock network compensation delay
IC Interconnect delay
iExt External input delay
LOOP Lumped combinational loop delay
oExt External output delay
RE Routing element (only for paths generated with the
-show_routing option)
uTco Register micro-Tco time
uTsu Register micro-Tsu time
uTh Register micro-Th time