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# Two Phase Clocks

32 Threads found on edaboard.com: Two Phase Clocks

## resistor between two opposite clocks

I am investigating the response of a circuit in which two synchronous clocks with 180 phase shift are connected by two 10 kohm resistors and the output is the common signal between the two resistors. May anybody help please? Since the two signals are out of phase at all (...)

## Sync / Async clock domains -> how to define?

two clocks with integer frequency ratio n:m are not per se asynchronous. The phase is varying stepwise with a minimal launch to latch delay according to the least common multiple of both clock. It can be well manageable for 3:5, but hardly for 37:50.

## Two submodule with the same clock period, but with different root clock

keep in mind to check the phase of the two clocks.

## Clock Domains -> how defined?

113 views and no replies. Tsk, tsk. That's what happens when you post a vague question. Anyway, read this: (from a Cadence paper) "A clock domain is defined as that part of the design driven by either a single clock or clocks that have constant phase relationships. A clock and its inverted clock or its derived divide-by-two (...)

## set_false_path for static input

Hi, I have a circuit with two asynchronous clocks, one low frequency clock SCK is for programming the coefficients COEF in the instance ISPI at the startup phase. Once the programming process is finished, COEF doesnot change any more, the other instance IFILTER cadenced by the other clock DIV takes the values in ISPI/COEF an

## modelling two-phase clock in Cadence RC

Hi, My design requires two clocks. One clock which has a 90 degree phase shift with respect to the other (but with same frequency). During synthesis (with cadence RC) I defined the first clock as follows: create_clock -name clk1 -period 1000 clk Now how do i specify the phase shift for the second clock? thanks in (...)

## Break before make circuit..what is it?

Yes, I was relating to two phase clock which don't overlap, so there is no chance that both clocks/signals are high at the same time. But, I get your point..thanks for your answers As an example, think of a switched capacitor circuitry. This works only in case of "break before make".

## How to evaluate removal check for asynchronous reset?

I have removal check violation during timing analysis. When I looked at the report, the asynchronous reset goes to two flops, one is clocked by the clock twice faster than the other one. The two clocks are synchronous(same phase). While calculating removal check for slower clock, it is adding one clock period (...)

## Instantiate CLOCK in VHDL (Xilinx)

Normally, we using core-gen to generate a clock in implementation. DCM/PLLs are not generating a clock, they are deriving multiplied/divided/phase shifted clocks from an external clock source, usually a crystal oscillator. Without core genrator you have two options: - using external clocks directly - instantiating DCM/PLL (...)

## Scheme to select one of the two clocks

dselec The clocks themselves do not have any relationship in terms of phase and frequency. There are two independent cloks and we need a gate level circuit diagram that can chose any one of them depending upon the value on the selectionl line. The selection line is one bit. So the clocks are not multiplication or division (...)

## verilog code for phase detector

i need a verilog code for phase detector to detect a positive edge of two clocks i.e one fast clock signal and one slow clock signal, simultaneously and produce output as just a single pulse..i need it soon..pls help out.

## jitter question, synchonizing two clocks

Hello friends, Can someone give me a little advice? I have a (quite pure) sine clock at about 12MHz and I need to multiply it 10 times to obtain 120MHz square. The question is originally jitter is multiplicative? Do I need to use dedicated multipliers like those:

## Literature needed on Static timing analysis

This is one of my favorite links for a beginners guide to STA STATIC TIMING ANALYSIS also weste harris has some pretty cool slides on two phase clocks, pulsed clocks, edge triggered flops and setup/hold/time borrowing here CMOS VLS

## Need some comments on my VHDL codes for async FIFO

Hi, everyone! I'm a beginner at VHDL coding. Recently in a project, we need to transfer data between two clock domains. These two clocks probably at the same frequency but with asynchronous phase. So I use async FIFO. The attachments include the VHDL codes and the testbench (not perfect). I don't know if it is fully (...)

## clk synchronous design methodologies

How can i synchronous two different clocks from two different modules.plz help me thanks in advance

## Compareing two clocks in VHDL

Hello can anybody help me to give logic for vhdl code, which will compare two frequencies say f1 and f2 and also their phase, and giving o/p based on the comparison.

## Phase shifter or delay line

Hi all, I am working on a design In which I have two clock that needs to be in sync always, however these two clocks are from different source. I want to add a phase shifter or delay line in between one of the clock so I can adjust the phase difference after the manufacture of the PCB. The frequency of (...)

## Clock Phase synchronisation

Can we phase synchronize two out of phase clocks using RTL code. If so can anyone share me the design approach.

## Help me with chopper amplifier

Just use two non overlapping clocks to switch the switches on and off .hence the input signal will get modulated ie multiplied by a square wave n in the output again use a similar pair of switches to turn on and off which is equivalent to the demodulation operation.

## Circuit that checks clocks performance that have different phase but same frequency

If the two clocks are XOR'ed, look for the XOR'ed output 1's posedge to coincide with a clock's posedge and negedge. The other clock is lagging this one.

## ANDing Clock with Data

it depends on the timing relation btw the two clocks

## 45 degree LO other than I/Q

Sure, take a 45deg vco phase and divide it by two using a toggle flip flop.

## What are the features of DCM in comparison with BUFG?

The DCM and the BUFG do not really compare. They serve two different purposes. The DCM is a digital clock manager which is a fancy name for a DLL or PLL. This is a complex block and shift clocks in phase, it can change the frequency of the input clock. A BUFG is just a global buffer that can connect to the low skew routing lines. (...)

## Detecting Rising edges of Clk1 and Clk2

are those clocks are from the same source??? What is phase shift between then, otherwise I dont think you can two risinggs at the same time

## Why we are using two phase clocks in 8085 microprocessor ?

Hey Its primarily done to double the frequency of operation (by triggering some actions at falling edge and some on rising edge) Here it's worth noting that 8085 has an internal clock divider.Having two phase clock again in a way compensates for that.Teason for employing such configuration is to have a more symmetric clock distribution.Please Ref

## What is a "clock pahse mixer"?

In a patent I encountered a block so called "clock phase mixer", which can average the rising edge and falling edge of two clocks. (see the waveform below,note the red reference line). How we relize it with circuit?

## Clock oscillator with 2 different phase shifts outputs

you want an oscillator on the board or generate two different clocks using FPGA? In case of FPGA, you can generate two clocks of different phase shifts using DCM/DLL/PLL

## How to generate a two phase differential non-overlapping clock?

from a single phase clock how to generate a two phase differential non-overlapping clock...

## High Speed Processor Clock Oscillators

The internal clock is a two stage operation. There is a crystal oscillator in the nx10 MHz range and then a phase locked loop with a divider in the feedback loop locked to the nx10 MHz crystal oscillator output. This is how they get the GHz internal clocks.

## How to measure and plot time jitter in Pspice?

Hi, I need to measure and plot time jitter (or phase difference between two clocks) using Pspice. Does anyone know how to do this? It has to be done with Pspice and in time domain.

## FASTSCAN and 2 clock domains

HI all, has any one experience in using FASTSCAN for scan pattern generation in a design where there are 2 (or more) clock domains. I want to pulse syncronously the two clocks during shift; then pulse sequestially in the capture phase. In this way it is possible to check also the connections between the different clock domains. Does (...)

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