Altera Quartus II Scripting Instrukcja Użytkownika Pobierz pdf (Strona 417)

Chapter 3: Tcl Packages & Commands 3–287

sdc

© July 2013 Altera Corporation Quartus II Scripting Reference Manual

create_clock

Usage

create_clock [-add] [-name <clock_name>] -period <value> [-waveform <edge_list>]

<targets>

Options

-add: Adds clock to a node with an existing clock

-name <clock_name>: Clock name of the created clock

-period <value>: Speed of the clock in terms of clock period

-waveform <edge_list>: List of edge values

<targets>: List or collection of targets

Description

Defines a clock. If the -name option is not used, the clock name is the same as the first target in the list or

collection. The clock name is used to refer to the clock in other commands.

The -period option specifies the clock period. It is also possible to use this option to specify a frequency to

define the clock period. This can be done by using -period option followed by either <frequency>MHz or

"<frequency> MHz". However, this is a TimeQuest-only extension and makes the SDC syntax

non-standard.

The -waveform option specifies the rising and falling edges (duty cycle) of the clock, and is specified as a

list of two time values: the first rising edge and the next falling edge. The rising edge must be within the

range [0, period]. The falling edge must be within one clock period of the rising edge. The waveform

defaults to (0, period/2).

If a clock with the same name is already assigned to a given target, the create_clock command will

overwrite the existing clock. If a clock with a different name exists on the given target, the create_clock

command will be ignored unless the -add option is used. The -add option can be used to assign multiple

clocks to a pin or port.

If the target of the clock is internal (i.e. not an input port), the source latency is zero by default.

If a clock is on a path after another clock, then it blocks or overwrites the previous clock from that point

forward.

The value of the targets is either a collection or a Tcl list of wildcards used to create a collection of the

appropriate type. The values used must follow standard Tcl or TimeQuest-extension substitution rules.

See the help for use_timequest_style_escaping for details.

Example

# Create a simple 10ns with clock with a 60% duty cycle

create_clock -period 10 -waveform {0 6} -name clk [get_ports clk]

# Create a clock with a falling edge at 2ns, rising edge at 8ns,

# falling at 12ns, etc.

create_clock -period 10 -waveform {8 12} -name clk [get_ports clk]

# Assign two clocks to an input port that are switched externally

create_clock -period 10 -name clk100Mhz [get_ports clk]

create_clock -period 6.667 -name clk150Mhz -add [get_ports clk]

# Two ways to use MHz to define clock period (TimeQuest only)

create_clock -period 250MHz -name clk250MHz [get_ports clk]

create_clock -period "250 MHz" -name clk250MHz [get_ports clk]

1 2 ... 412 413 414 415 416 417 418 419 420 421 422 ... 633 634

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Table des matières

 

1

PARABÉNS!

2

ENHORABUENA

2



2

COMPLIMENTI

2

OUR COMPLIMENTS

2

ÍNDICE CAPÍTULO

3



3

CAPITOLO 1

4

CHAPTER 1

4

CAPÍTULO 1

4

K 1

4

902. 100. 150

5

CAPITOLO 3

6

CHAPTER 3

6

CAPÍTULO 3

6

K 3

6

VEDERE TARGHETTA DATI

8

CAPITOLO 5

9

CHAPTER 5

9

CAPÍTULO 5

9

K 5

9

  

12

" 

16

K 

17



17

BOTÃO MANTER ÁGUA

18

K "AQUAPLUS"

19

K "K

20

BOTÃO INÍCIO (START)

21

Alterar a programação após

21

CANCELANDO O PROGRAMA

21

K 

22

CAPÍTULO 7

25

TABELLA PROGRAMMI

26

CAPITOLO 7

26

 

27

K 7

27

TABLA DE PROGRAMAS

28

CHAPTER 7

29

TABLE OF PROGRAMMES

29

K 8

30

CAPITOLO 8

30

CAPÍTULO 8

30

CHAPTER 8

30

14’-30’-44’ “ tramite

31

CAPITOLO 9

33

CHAPTER 9

33

CAPÍTULO 9

33

K 9

33

CAPITOLO 10

34

CHAPTER 10

34

CAPÍTULO 10

34

K 10

34

CHAPTER 11

35

CAPITOLO 11

35

CAPÍTULO 11

35

K 11

35

LAVAGGIO

36

CAPITOLO 12

38

CHAPTER 12

38

CAPÍTULO 12

38

K 12

38

OBSERVAÇÃO:

40

MÁQUINA

40

CAPITOLO 13

41

K 13

42

CAPÍTULO 13

43

CHAPTER 13

44

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