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74 Threads found on Flip Flop Delay
Thank you for the reply!!! I appologize for the unclear description. I simulated my d flip flop in modelsim, verfied the functionality. Then loaded the d flip flop verilog code to synopsys design vision. I loaded link and target libraries and synthesized the design. Next i added delays to the input and (...)
Hello, Wonder how the placement detail of double flop synchronizer handled? I came across this below text from the paper "A word of caution: the two flip-flops should be placed near each other, or else the wire delay between them would detract from th
Hi All, I have attached a figure. 130355 Can this architecture be used as D flip-flop (edge triggered) provided delay of inverter is very less? if Yes, then why don't we use it, as it will take less area? Regards, Ashish PS : Please ignore this post. It's wrongly posted.
I am designing a phase frequency detector for a PLL using the standard configuration as shown below. 121611 Each D FF is implemented as shown below: 121613 Can you tell me how I can determine the maximum operating frequency of each flip flop? Also, how do the sizing of the CMOS pairs in e
The D stands for delay. It is nothing but a flip flop (a DFF).
for a conditional discharge flip flop circuit how to do theoretical analysis such as calculating total power, leakage power, delay
Hi. I need to construct an 8-bit accumulator. For this, I need an 8-bit adder. But my ASIC vendor?s technology library has only 4-bit adders. So I construct the accumulator. When I synthesized the circuit, I found that there was a max-delay violation on the ?Carry? signal between the two adders. To correct this, I added a flip flop in (...)
What's about Min delay constraints? Min delay plays a role between the 1st stage and 2nd stage flip flop in a 2 stage synchronizer. As there are no combo logic between 1st and 2nd stage FF in a synchronizer the signal may reach fast enough to cause hold time failure in the 2nd FF. If the hold time requirement of the 2nd
I think he mean you can take flip-flop delay time for maximum rate of the response of each component.
synopsys design visions, report _areas is sequential cells counts = flip flop counts ?
Hi, I run some simulations on a D flip-flop. If input signal D changes at the active edge of CLK of the DFF, it's obvious that output will delay a cycle. But when D and CLK separately connects to a IO pad whose delay is 1ns, I get a different result that output Q follows input D without any delay. (...)
you can detect it with a d-latch or d-flip flop in which the D input is connected to '1' and pulse input is connected to clock pin.with an incomming pulse, output goes can use another FF to reset the first FF and make it ready for another incomming pulse.
Is that signal width long enough to change the state of flip flop? Or even better asked could this two logical circurit works the same if we looked at the as black boxes and just watch the input and output?Whether is works or not depends upon the actual pulse width and if that width if long enough to clock the part
HI. Consider the case where you have some data that you want to latch into a register under some particular conditions: Here you would assert the gate signal whenever you want to save the data from flip-flop D1 into flip-flop D2 (maybe the D2 is a read buffer or part of a shift register, and a read transaction was just (...)
do you want the circuit to hod its state (or latch on ) after the on delay? if yes then this is the circuit. 85582 else you can attach a flip flop to the o/p
Hi, I am trying to design a flip-flop. I am using Cadence Virtuoso. I am trying to get the setup time of the circuit by checking the point where the c-q delay increases by 20%. Can you help me with varying the position of rising edge of data with respect to the clock. I also think that I might have to use PERL script to do it?? Or is (...)
I'd like to measure propagation delay through a chip. This is often on the order of 5-7 ns, and I'd like to be able to sense down to a nanosecond or less so I can get good accuracy. Here's the approach I'm thinking: I'm interested in measuring delay through a logic chip (this whole project is for a demonstration) so
hi, if a flip-flop triggers at positive edge of a clock then what is the time required for the output to change and what are the factors affecting the change of output. is this delay means clock to out delay only ? when it refers to positive edge triggering what is the actual time for which sampling occurs ?
You probably need to use an ECL or PECL device. I'm not sure there is a one-chip solution, but you might be able create a circuit with a flip-flop and a delay line.
retain arc is basically Clock-> Q arc in D flip flop. Retain time is defined as the shortest delay from input port (CLK) to O/P port (Q). therefore the definition on retain_rise_slew and retain_rise is apparent.