42 Threads found on edaboard.com: Level Trigger And Edge Trigger
When we choose to use edge and when level Sensitive interrupts? What difference between them?
level Sensitive Interrupt -> what problems it has and how they might be resolved?
ASIC Design Methodologies and Tools (Digital) :: 13.11.2005 06:10 :: ldm :: Replies: 6 :: Views: 9650
manasiw2 u cant do that, if u tie the clock to the select pin using a single MUX then if become latch no DFF cause the output will change as long as the input is changing if the clk is still high.
It become level trigger not edge trigger.
I think kanagavel_docs have provide a good (...)
ASIC Design Methodologies and Tools (Digital) :: 06.11.2007 00:57 :: laststep :: Replies: 7 :: Views: 3005
There are few points to be note here....
1. Make sure that the interrupt is not masked. and note its priority!
2. Whats the nature of interrupt I mean level sensitive OR edge trigger or both??
3. You are using switch that mans you may need debouncing!!
PLD, SPLD, GAL, CPLD, FPGA Design :: 06.09.2005 00:27 :: nand_gates :: Replies: 1 :: Views: 780
When I use positive level trigger D-latch, What's the propagation time for D-latch?
I.e. from positive edge or from negative edge?
Any suggestions will be appreciated!
ASIC Design Methodologies and Tools (Digital) :: 27.10.2005 23:41 :: davyzhu :: Replies: 3 :: Views: 1130
Only one. Otherwise, it's a buffer.
When level is high, latch gets whatever value coming in. When level is low, it won't latch new value (it stays at old value)
ASIC Design Methodologies and Tools (Digital) :: 17.03.2006 12:59 :: stevepre :: Replies: 10 :: Views: 784
what exactly is the difference between triggering done by edge and level of a signal.?
Thanks In Advance
Electronic Elementary Questions :: 02.03.2008 07:02 :: graciousparul :: Replies: 6 :: Views: 1764
This is my I2C interface code for TMP100, i know it's having lot's of mistakes, i have desined using edge triggering and how to write code for edge triggering and shall i make scl signal is input r output, and shall i design (...)
PLD, SPLD, GAL, CPLD, FPGA Design :: 17.12.2008 19:36 :: Mkanimozhi :: Replies: 1 :: Views: 823
It's instructive to review the transistor or gate level schematics of usual edge sensitive flip-flops. You'll realize, that they are made of two level sensitive building blocks (latches). See the HC74 schematic from the TI datasheet. You can replace two transfer gates by a multiplexer, if you
ASIC Design Methodologies and Tools (Digital) :: 23.05.2010 04:55 :: FvM :: Replies: 9 :: Views: 1798
I have got a situation where is triggering is continuous, i have to generate a 1 second pulse by triggering through a continuous high level voltage, there is no falling edge till the circuit gets reset. Not getting any clue.. :-|
Analog Circuit Design :: 27.02.2011 07:39 :: memustufa :: Replies: 1 :: Views: 1048
I have read the ARM document about Cortex-M3 (or M0) and it say it can be used as level sensetive or pulse (edge) interrupt within the NVIC controller. The problem that it rather vague on how to do this, if this is done by software.
I fails to see any kind of register within the NVIC or such that control the type of the interrupt (to (...)
Microcontrollers :: 21.07.2011 23:22 :: riscy00 :: Replies: 1 :: Views: 825
I wonder how you drive a LED from the comparator output and keeping a sufficient high level at the same time? Without a schematic that shows all component values it's hard to know.
Analog Circuit Design :: 23.09.2012 09:28 :: FvM :: Replies: 7 :: Views: 423
Please excuse me, I didn't get you. actually what your doing there?
I guess you need two signals from op-amps (using two external interrupt.. please note it external interrupt is only a trigger like rising or falling edge of the signal).you wish to calculate time difference between both interrupt events. am I right friend? (...)
Microcontrollers :: 08.06.2013 14:13 :: Jinzpaul4u :: Replies: 7 :: Views: 315
What are the limits of the prf detector? If these are logic level pulses or can be converted to logic levels by a comparator you can use a counter which is reset periodically and then examine the count value.
Microcontrollers :: 07.05.2003 19:45 :: flatulent :: Replies: 7 :: Views: 1112
you can debounce by software.
Normally slow signals can be triggered to with an interrupt. The moment when the trigger occurs is not precise to the edge of the signal any more. This can now drift by temperature etc.
One thing you can do is leave away your capacitor. when first receiving a rising (...)
Microcontrollers :: 16.10.2003 11:30 :: Aoxomox :: Replies: 6 :: Views: 1629
does somebody have 'drag and drop' asm library for decoding 1/3-2/3 pulses ?
bit 0 is 1/3 x total period logic level 0 and 2/3 x total period 1
bit 1 is 2/3 0 and 1/3 1
this code can be inverted, no matter
Microcontrollers :: 14.01.2004 11:16 :: tgq :: Replies: 3 :: Views: 1254
Hi all, I can't get ISP1581's interrupt output signal, plz help me!
I think I have configed all neccessary registers for interrupt signal output pin, such as GLINTEN bit of mode register,also the interrupt configure register & interrupt enable register, and I tried every trigger mode, but saddly the output is always high(high (...)
Microcontrollers :: 22.12.2004 05:36 :: eDance :: Replies: 2 :: Views: 730
The Simulink block "Variable Transport Delay" is found in 6.5 and 7.0 at least and could model a DLL.
The problem could be that the "Variable Transport Delay" uses a discrete time circular buffer. That is to allow logic, real and complex values to path at the input at a higher rate than the delay time. That limit time resolution to (...)
Analog Circuit Design :: 12.10.2005 10:47 :: rfsystem :: Replies: 5 :: Views: 3515
If your clock spike is not large and locate on high or low voltage level (not on edge), schmitt triger inverter is a good choice.
ASIC Design Methodologies and Tools (Digital) :: 11.09.2006 23:50 :: laglead :: Replies: 5 :: Views: 914
Maybe you could trying taking the control shot not from the relay directly but after a differentiatot (RC Cicruit) followed by a voltage clipper (Diode + R) to take only the off-on transistion.
i.e. Relay -> Differentiator->Negative level
Electronic Elementary Questions :: 23.10.2006 17:21 :: elmolla :: Replies: 5 :: Views: 2085
Jep is correct, you can not have another signal edge trigger event after clock_edge_trigger. It will always gives error. and it is also NOT NECESSARY!
Use only level trigger.
eg. if (...)
PLD, SPLD, GAL, CPLD, FPGA Design :: 09.12.2007 14:27 :: mpatel :: Replies: 2 :: Views: 1776
It is because latch is level sensitive.
Meaning, as long as latch enable is active, any signal at input port will be captured at the output port.
Unlike Flip flop, it is an edge sensitive or edge trigger.
The output port will capture the input signal at edge (...)
ASIC Design Methodologies and Tools (Digital) :: 24.02.2008 20:54 :: no_mad :: Replies: 2 :: Views: 1171
How will delay is generatedin verilog. What is circuit for edge triggerred and level trigerred inpus.
PLD, SPLD, GAL, CPLD, FPGA Design :: 20.03.2008 00:33 :: deeptijohar :: Replies: 5 :: Views: 552
i understand here u want to add dc components to ur output pulse abt 1.5v
i mean here shift zero level of output pulse.
or want to control the vp of ur output pulse.
Analog Circuit Design :: 03.12.2009 12:17 :: nashwan :: Replies: 10 :: Views: 3211
If EPROM's CE and OE pins are edge-triggered, it's not possible to read data continuosly. If they are level triggered, it's possible to read data by changing address inputs.
PLD, SPLD, GAL, CPLD, FPGA Design :: 19.08.2010 07:34 :: Ilgaz :: Replies: 6 :: Views: 892
Sorry If I am spelling your name differently (just guessing that it may be you name).
After reading your problem, It looks to me that its a simple problem of level triggring. Means the chip/circuit in which this signal is transfering may be level capture circuit.
Let me explain in other way...
For every signal when ever its changi
Professional Hardware and Electronics Design :: 12.02.2011 02:42 :: birdy123 :: Replies: 4 :: Views: 835
Just want to confirm if the purpose of averaging in acquisition mode in a oscilloscpe is to average the absolute signal and remove the apparent and random noise. Is it applicable or right to use averaging in an oscilloscope in measuring very low level ripple in a DC/DC converter?
Power Electronics :: 10.07.2011 00:36 :: alimjoco :: Replies: 6 :: Views: 854
remove the two lines that define sei() and
cli() , they are already defined in so you don't need to redefine them.
The problem that I see is that you have INT1 to trigger with a rising edge on the pin but you haven't connected a pull down resistor to ensure that it can't (...)
Microcontrollers :: 26.09.2011 04:31 :: alexan_e :: Replies: 4 :: Views: 658
It is very common to have a "pad" module in modern I.C. design library. Besides including both input and output capable circuits there are ESD protection, Schmitt trigger configuration, output drive strength setting, pull-up or pull down resistor, edge polarity detection/latching for interrupt signalling, (...)
Electronic Elementary Questions :: 18.04.2012 20:51 :: RCinFLA :: Replies: 4 :: Views: 408
The FlipFlop is usually described as "positive-edge-triggered". You find the same gate level diagram for TTL IC 7474 (with additional nPRE and nCLR inputs).
Please notice, that all usual edge-triggered circuits, e.g. CMOS transfer gate designs are (...)
ASIC Design Methodologies and Tools (Digital) :: 01.03.2012 07:01 :: FvM :: Replies: 4 :: Views: 846
What's the exact difference between edge and level triggering in an oscilloscope? I have searched the Tectronix book but I couldn't find level triggering at all. I am quite confused. Could you help me?
Thanks a lot...
Electronic Elementary Questions :: 15.06.2012 23:13 :: SherlockBenedict :: Replies: 6 :: Views: 530
I'd use a CMOS comparator like, e.g. LMC7211, supply it with 5 .. 5.5V and set the trigger level at 4V.
Analog Circuit Design :: 29.06.2012 07:49 :: erikl :: Replies: 6 :: Views: 294
I don't understand though why "reset" is under "negedge" in the sensitivity list...
The aynchronous reset of a DFF is level sensetive and not edge I see it, the code should be
always @ ( posedge clk or reset)
always @ ( posedge clk or (...)
PLD, SPLD, GAL, CPLD, FPGA Design :: 13.07.2012 09:20 :: j_andr :: Replies: 10 :: Views: 520
the FF is triggered by edge (falling or rising) and a latch is trigger by level
Electronic Elementary Questions :: 29.08.2012 10:47 :: gabrielg :: Replies: 3 :: Views: 529
I have not worked with the Philip's chip before, but I once worked with it's National counterpart. Anyway, the interrupt is an active-low interrupt. If I'm not wrong, the interrupt signal will remain low as long as the interrupt conditions on the usb controller has not been cleared. However, the PIC's external interrupt pin is (...)
Microcontrollers :: 31.07.2004 10:37 :: checkmate :: Replies: 3 :: Views: 967
yes its a Latch. what doubt u have in that?
Latch is level sensitive, so in the diagram B is the select line and A is the D input. u can understand from the wave form easily.
for practical understanding write a verilog code, simulate and see..
ASIC Design Methodologies and Tools (Digital) :: 07.03.2008 02:09 :: research_vlsi :: Replies: 15 :: Views: 5014
You may use a two input OR gate with an RC delayed signal to one input and the signal direct to the other input, and use the output of the OR gate.. In this case you have to make sure that the high period of the signal is long enough to charge the capacitor to high level even for the first time.
An alternative method is to (...)
Professional Hardware and Electronics Design :: 10.04.2008 09:08 :: laktronics :: Replies: 3 :: Views: 1618
On power-on all I/O pins are set as inputs and pulled-up by internal (weak) circuit ..
ExtInt0 and ExtInt1 can be set to trigger an interrupt on the falling edge or low level, that mans that you can safely pull them down to the GND level and by doing so (...)
Microcontrollers :: 27.03.2010 01:53 :: IanP :: Replies: 2 :: Views: 700
As long as the ege of your signal are less than 10mS apart, the easiest way would be to use the "Interrupt On Change" interrupt to detect an edge, and set a timer to trigger 10mS later. When the timer interrupt fires, set an output bit according the the input level at capture time.
Microcontrollers :: 28.04.2010 13:15 :: GSM Man :: Replies: 3 :: Views: 555
This problem has had me pulling my hair out for 2 weeks now... it is wired up on my bench and can't find the right incantation to make it work!
How do I do TTL level switching of a high voltage A/C circuit with the modified sine wave as shown? Should I be using something other than a triac? Is the problem that the load is capacitive?
Power Electronics :: 04.03.2011 23:39 :: AleXYZ :: Replies: 23 :: Views: 6063
There are many kinds and sources of noise, and the method you would use to
characterize a transistor or an amplifiier's generated noise, is different than
the methods you'd use to chase down system level noises like the interferer
A spectrum analyzer will let you find continuous fixed-frequency "noise". But
inj a digital (...)
Analog Circuit Design :: 20.03.2011 15:28 :: dick_freebird :: Replies: 3 :: Views: 1485
In gate level simulation you have to take care about trigger you your stimulus on proper time.
Most of time improper trigger of reset will cause problem in you gate level simulation, while in you RTL same test-bench will work. For you if you are reducing clock frequency you are getting (...)
ASIC Design Methodologies and Tools (Digital) :: 14.10.2011 01:24 :: shitansh :: Replies: 6 :: Views: 407
You could begin with simple substitution, but you run into
the problem that MOS VT varies way more than BJT Vbe,
in "make" tolerances, and about as badly with temperature.
You would need a shunt at the final devices which is not
there, probably because pumping the shunt BJTs into
saturation and staying there for free is a good thing for
Analog Circuit Design :: 16.11.2012 15:27 :: dick_freebird :: Replies: 2 :: Views: 345