clock

Drive input clock to output

由 冷暖自知 提交于 2019-12-02 21:37:15
问题 I've a module that have a 8bit input and a serial output, I want to serialize input data and synchronize it with a clock. I want to set my data when falling edge then wait when clock rise, when clock fall again I set another data. I don't want to connect the directly reference clock to the output because when I don't use this module I want a 1 state on clock output. I've tried this code: process(Clock, ModuleReset) begin if ModuleReset = '0' then OutData <= '0'; OutCK <= '0'; counter <= 7;

Synchronous vs Asynchronous Resets in FPGA system

由 依然范特西╮ 提交于 2019-12-02 20:50:48
问题 I'm new to creating a FPGA system to drive an I2C Bus (although I imagine that this problem applies to any FPGA system) using a variety of different modules, and which all use a synchronous reset. The modules are clocked using a clock divider module that takes the system clock and outputs a lower frequency to the rest of the system. The problem I'm having is, when the reset signal goes low, the clock divider resets, and therefore the clock that other modules depend on stop - thus the other

What is a clock cycle and clock speed?

由 匆匆过客 提交于 2019-12-02 19:07:49
I have been reading a book about the Computer's Processor. And i came across some of the terms like clock Ticks, clock Cycle and Clock Speed that i am finding very difficult to understand. I will be very thankful if someone can clarify this in a simple language. Thanks in advance ! Clock Cycle is the speed of a computer processor, or CPU, is determined by the clock cycle, which is the amount of time between two pulses of an oscillator. Generally speaking, the higher number of pulses per second, the faster the computer processor will be able to process information. The clock speed is measured

VHDL - How should I create a clock in a testbench?

由 杀马特。学长 韩版系。学妹 提交于 2019-12-02 16:20:05
How should I create a clock in a testbench? I already have found one answer, however others on stack overflow have suggested that there are alternative or better ways of achieving this: LIBRARY ieee; USE ieee.std_logic_1164.ALL; ENTITY test_tb IS END test_tb; ARCHITECTURE behavior OF test_tb IS COMPONENT test PORT(clk : IN std_logic;) END COMPONENT; signal clk : std_logic := '0'; constant clk_period : time := 1 ns; BEGIN uut: test PORT MAP (clk => clk); -- Clock process definitions( clock with 50% duty cycle is generated here. clk_process :process begin clk <= '0'; wait for clk_period/2; --for

Making a clock divider

由 夙愿已清 提交于 2019-12-02 13:08:54
问题 I found this code in how to make a clock divider. I have a general understanding on how to make a divider using counters but i not sure what this code is doing and why its doing it. entity clkdiv is Port ( mclk : in STD_LOGIC; clr : in STD_LOGIC; clk190 : out STD_LOGIC; clk48 : out STD_LOGIC); end clkdiv; architecture clkdiv of clkdiv is signal q: std_logic_vector(23 downto 0); begin --clock divider process(mclk,clr) begin if clr ='1' then q <= X"000000"; elsif mclk'event and mclk = '1' then

clock() - execution time for c function

由 ￡可爱￡侵袭症＋ 提交于 2019-12-02 12:13:02
问题 I am trying to measure the execution time of a code block in C. I have something like this in my code: clock_t begin, end; double time_spent; begin = clock(); ATL_dsymv(122,n,alfa,A,n,X,1,beta,Y,1); end = clock(); time_spent = (double)(end - begin) / CLOCKS_PER_SEC; printf ("(%f seconds)",time_spent); But it always returns: (0.000000 seconds). I tried the same thing on simpler code blocks like for's but it has the same result. What am I doing wrong? Thanks a lot. 回答1: clock usually has very

C#, System.Timers.Timer, run every 15min in sync with system clock

由 为君一笑 提交于 2019-12-02 11:26:05
问题 How do I get System.Timers.Timer to trigger Elapsed events every 15 mins in sync with the system clock? In other words, I want it to trigger exactly at xx:00, xx:15, xx:30, xx:45 (where xx means any hour) 回答1: You could let it elapse every second and check whether the current time is 00, 15, 30 or 45 and only then forward the event. A first idea would be: private static System.Timers.Timer aTimer; private static System.DateTime _last; public static void Main() { aTimer = new System.Timers

Python 2.x - sleep call at millisecond level on Windows

由 狂风中的少年 提交于 2019-12-02 06:52:55
I was given some very good hints in this forum about how to code a clock object in Python 2. I've got some code working now. It's a clock that 'ticks' at 60 FPS: import sys import time class Clock(object): def __init__(self): self.init_os() self.fps = 60.0 self._tick = 1.0 / self.fps print "TICK", self._tick self.check_min_sleep() self.t = self.timestamp() def init_os(self): if sys.platform == "win32": self.timestamp = time.clock self.wait = time.sleep def timeit(self, f, args): t1 = self.timestamp() f(*args) t2 = self.timestamp() return t2 - t1 def check_min_sleep(self): """checks the min

c++ clock_gettime() and daylight savings

由 好久不见. 提交于 2019-12-02 04:36:45
问题 I am using clock_gettime() in my C++ program to get the current time. However, the return value is seconds since epoch in UTC. This code can get messed up in my time zone during daylight savings when the time shifts by one hour. The system itself has NTP syncing it to always give the correct time in EST. Is there a way to get clock_gettime() to report the local time instead of UTC so I can avoid the daylight savings issue? 回答1: Realize that time also reports seconds since the beginning of

clock() function always returning 0 [duplicate]

由 僤鯓⒐⒋嵵緔 提交于 2019-12-02 02:23:53
问题 This question already has answers here : Closed 7 years ago . Possible Duplicate: The C clock() function just returns a zero I ran the following code to test the working of clock() function. I work on ubuntu 12.04. #include <stdio.h> #include <time.h> #include <iostream> using namespace std; double diffclock(clock_t clock1,clock_t clock2) { double diffticks=clock1-clock2; double diffms=(diffticks*10)/CLOCKS_PER_SEC; return diffms; } int main() { string name; int i; clock_t begin=clock(); cout
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