Can Quartus multiple clock pulse inputs be used with one pin?

74LS74 is a double D flip-flop, the Q non-output terminal of one of the D flip-flops is connected to the D input terminal, and the clock signal input terminal is connected to the clock input signal, so that every time a clock pulse comes, the state of the D flip-flop will be flipped once, and every two Clock pulses will make the D flip-flop output a complete square wave, which realizes the 2-way frequency. By connecting two D-flip-flops on the same 74LS74 in series, the output of one D-flip-flop is used as the clock signal of the other D-flip-flop, and 4-way frequency can also be realized.

clk is the input pin, cout is the output pin, ldn, a, b, c, and the last state is 1001.

This can be adjusted by yourself, and you can choose to input a single pulse.

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The clock of your development board should be fixed, you should know what the frequency is by looking at the schematic, and if you want to get other frequencies, you can write a crossover yourself.

No problem, you can do it like this, I've used it.

If the CPLD crystal oscillator is high, there will definitely be interference problems, and you have to put some effort into the wiring, but you also have to determine it according to your actual needs, and the two CPLD models you said do not have frequency multipliers such as PLL. But these two should be fine to run 25m, I use 40m,

You can use another pin output to send another one as a clock, which will reduce the working frequency of the circuit, and there are also some integrated frequency multi-output chips to choose from, that is, the crystal oscillator is more than one point to multiple CPLDs

The first suggestion is to change to EPM1270, that EPM7160SLC is too old and discontinued.

It's better to get a newer, larger device.

The same goes for the price. The resource is ten times larger.

Second: If two CPLDs are used, either the two methods of gaojunyao1981 are used to enter one CPLD and then output to the second CPLD. Or just add the clock bufer

It should be no problem, you check how your crystal oscillator carrying capacity is. If the frequency is high, the interference will definitely be stronger.

With the non-true value table is.

1 in 2 out.

For example, if you enter a pulse type from the input 1 access.

When you enter 2 to 1, you allow the input 1 pulse to pass through and the input pulse to be reversed, from 1 to 0 or from 0 to 1

When you enter 2 is 0, then prohibit the passage of 1 pulse, at this time, the output pulse is always 1, and the output pulse does not change with the change of the input pulse, which means that the input is prohibited.

NAND gate logic characteristics: the output is low only when all inputs are high; As long as one input is low, the output is high.

To output high, one input input is a continuous pulse, and the rest are terminated low.

To disable the pulse output, the rest is terminated high.

Yes, many of them use active crystal oscillators as inputs, and the output is sine waves.

Testbench chips with Quartus have a fixed number of pin-connected clock inputs, which can only be used for software debugging.

Generate an excitation signal to test other modules. Generally, the crystal oscillator input pins on the block development board are fixed, which belongs to the test.

Try the program, and you will see a dedicated clock in the drop-down menu of location, and it will be in the pin

assignment, the pin can be connected to the clock input.

It's very simple.

reg new_data0 ;

reg new_data1 ;

always@(posedge clk) beginnew_data0 <=data;

new_data1 <=new_data0 ;

In the end figure, the new data is beaten 2 times, which is the new data1 in **

Different pins (pins) of each chip correspond to different functions. For example, there are pins that correspond to light-emitting diodes.

Some are the control end of the digital tube, and some are input clocks.

Once you have the comparison table, you can bind the inputs and outputs in your circuit to the pins that have the corresponding functions. Using the pin assignment (like in the tool menu bar), you can bind the pins.