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detecting rising edge

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iliya24

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Hello.

I have an Enitiy that have in siraial input ,clk and output bus.

i need to count time between falling edge of my input until rising edge of the same input but all this needs to be synchronize to main cl k.
Thx
 

put a double syncroniser (flop1 ,flop2)and connect the output of this to a 3 rd flip flop...
now use (a and ~b) logic at the output of flops 2 and 3
where a and b are outputs of flops 2 and 3
...
all the flops are synconosed to mainclk...


Hello.

I have an Enitiy that have in siraial input ,clk and output bus.

i need to count time between falling edge of my input until rising edge of the same input but all this needs to be synchronize to main cl k.
Thx
 
Thx, could u help me some more i am a new to all this i cant realy undersatn how 3 flip lops will help me to detected risiing ede and falling edge i need to detected both but on the same input .
thx.
 

a exor b can detect both rise and fall edge
a and ~b detects rise edge
~a and b detects fall edge
please draw the circuit and verify by drawing waveforms

Thx, could u help me some more i am a new to all this i cant realy undersatn how 3 flip lops will help me to detected risiing ede and falling edge i need to detected both but on the same input .
thx.

- - - Updated - - -

a xor b can detect both rise and fall edge
a and ~b detects rise edge
~a and b detects fall edge
please draw the circuit and verify by drawing waveforms

Thx, could u help me some more i am a new to all this i cant realy undersatn how 3 flip lops will help me to detected risiing ede and falling edge i need to detected both but on the same input .
thx.
 
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