What is the VHDL code for the clock divider?
The VHDL code for the clock divider is synthesizable and verified on FPGA. In the VHDL code for simulation purposes, the divisor is set to be 1 so the clock frequency of clk_out is obtained by dividing the frequency of clk_in by 2 as explained in the main VHDL code of the clock divider.
How to create a 50% duty cycle divider in VHDL?
Figure 1 The VHDL code for a 50%-duty-cycle divider creates various timing relationships, such as that for a divide-by-5 implementation. The code includes a package-declaration section, so a simple use clause makes this section visible in a higher level design. The architecture of the design requires three inputs.
Is there a 50% duty cycle divided down clock?
Realizing a 50%-duty-cycle, divided-down clock is not always a trivial task, particularly when the divisor rate is an odd number. You can use the VHDL source code in Listing 1 to synthesize an FPGA or a CPLD circuit that produces a 50%-duty-cycle waveform for any integer N greater than 0.
Why do you need clock divider in FPGA?
The integer clock divider allows you to reconfigure the clock frequency simply setting the clock division factor. When you deal with custom hard macro inside the FPGA i.e transceiver, PCIe macro and so on, this approach cannot be used. In this case, the layout tool raises an error when the clock routing is not possible.
What is the name of the clock divider?
Clock Divider is also known as frequency divider, which divides the input clock frequency and produce output clock.
How to implement clock divider without the reset signal?
Implementing the divider without the reset signal, you shall set the initial condition to clk_counter signal during the declaration of the signal itself: Remember that this VHDL code it is still synthesizable, so you can use it without any problem, but your clock divider start condition is unknown.
How to calculate clock rate in VHDL surf?
The second bit, bit1, numbering LSB as bit 0, change its status at half of bit 0, so bit 1 rate is ¼ of clock rate. The bit k rate is 1/ (2^ (k+1)) clock rate. The VHDL for clock divider by a power of two is very simple and straightforward as you can see in the example below.