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How do I create a delay in VHDL?
The inertial delay model is the default delay implemented in VHDL because it’s behavior is very similar to the delay of the device. The delay assignment syntax is: b <= a after 20 ns; In this example b take the value of a after 20 ns second of inertial delay.
What is clock conditioning circuit?
The ProASIC3E Clock Conditioning Circuit (CCC) contains a PLL core, delay lines, clock multipliers/dividers, PLL reset generator (you have no control over the reset), global pads, and all the circuitry for the selection and interconnection of the “global” pads to the global network.
Which delay can be Modelled as transport delay?
Explanation: Transport delay represents a wire delay in which any pulse is propagated to the output signal delayed by a specified delay value. Therefore, Transport delay is useful in modeling the delay line devices and path delays in ASICs.
How to simulate a digital clock in VHDL?
Simulation results for the digital clock in VHDL: It is noted that when you run the simulation, you should use direct clock from input to simulate instead of the 1-second clock or reduce the value of the divisor in the clk_div entity because it would take a long time to create the 1-second clock.
How does VHDL work on a FPGA 2?
How VHDL works on FPGA 2. VHDL code for FIFO memory 3. VHDL code for FIR Filter 4. VHDL code for 8-bit Microcontroller 5. VHDL code for Matrix Multiplication 6. VHDL code for Switch Tail Ring Counter 7. VHDL code for digital alarm clock on FPGA 8.
What is the built in time type in VHDL?
VHDL defines built-in time type like this: type time is range – 2147483647 to 2147483647 units fs; ps = 1000 fs; ns = 1000 ps; us = 1000 ns; ms = 1000 us; sec = 1000 ms; min = 60 sec; hr = 60 min; end units ; It is a textbook example of physical type with primary unit: femtoseconds and secondary units up to an hour.
How to calculate granularity of time in VHDL?
Please note that range of values of the type is described using 32-bit signed integer, not real type. It means that the granularity of time in VHDL cannot be finer than 1 fs: decimal fractions of time can only happen if the secondary time units are used.