Altera Quartus II Scripting Manuel d'utilisateur télécharger pdf (Page 468)

3–338 Chapter 3: Tcl Packages & Commands

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Quartus II Scripting Reference Manual © July 2013 Altera Corporation

set_max_skew

Usage

set_max_skew [-exclude <Tcl list>] [-fall_from_clock <names>] [-fall_to_clock <names>]

[-from <names>] [-from_clock <names>] [-include <Tcl list>] [-rise_from_clock <names>]

[-rise_to_clock <names>] [-through <names>] [-to <names>] [-to_clock <names>] <skew>

Options

-exclude <Tcl list>: A Tcl list of parameters to exclude during skew analysis. This list

can include 1 or more of the following: utsu, uth, utco, from_clock, to_clock,

clock_uncertainty, input_delay, output_delay

-fall_from_clock <names>: Valid source clocks (string patterns are matched using Tcl

string matching)

-fall_to_clock <names>: Valid destination clocks (string patterns are matched using Tcl

string matching)

-from <names>: Valid sources (string patterns are matched using Tcl string matching)

-from_clock <names>: Valid source clocks (string patterns are matched using Tcl string

matching)

-include <Tcl list>: Tcl list of parameters to include during skew analysis. This list

can include 1 or more of the following: utsu, uth, utco, from_clock, to_clock,

clock_uncertainty, input_delay, output_delay

-rise_from_clock <names>: Valid source clocks (string patterns are matched using Tcl

string matching)

-rise_to_clock <names>: Valid destination clocks (string patterns are matched using Tcl

string matching)

-through <names>: Valid through nodes (string patterns are matched using Tcl string

matching)

-to <names>: Valid destinations (string patterns are matched using Tcl string matching)

-to_clock <names>: Valid destination clocks (string patterns are matched using Tcl

string matching)

<skew>: Required skew

Description

Use the set_max_skew constraint to perform maximum allowable skew analysis between sets of registers

or ports. In order to constrain skew across multiple paths, all such paths must be defined within a single

set_max_skew constraint. set_max_skew timing constraint is not affected by set_max_delay,

set_min_delay and set_multicycle_path but it does obey set_false_path and set_clock_groups.

Legal values for the -from and -to options are collections of clocks, registers, ports, pins, nets, cells or

partitions in a design.

Applying maximum skew constraints between clocks applies the constraint from all register or ports

driven by the clock specified with the -from option to all registers or ports driven by the clock specified

with the -to option.

If pin names or collections are used, the -from value must be a clock pin and the -to value must be any

non-clock input pin to a register. Assignments from clock pins or to and from cells apply to all registers

contained in the cell or driven by the clock pin. Similarly, -to and -from partition specifications apply to all

registers in the specified partition.

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Altera Quartus II Scripting Manuel d'utilisateur Page 468

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