Generic map(ClockFrequencyHz => ClockFrequencyHz) We're slowing down the clock to speed up simulation timeĬonstant ClockFrequencyHz : integer := 10 - 10 HzĬonstant ClockPeriod : time := 1000 ms / ClockFrequencyHz
#Modelsim altera 9.0 how to
In this video tutorial we will learn how to create a timer module in VHDL: But it will also react slower because the chain of events becomes longer. We are limited by the available physical resources in the underlying technology as well as the length of the counter versus the clock frequency.Īs the length of the counters increase, obviously it consumes more resources. We can continue this approach for counting days, weeks, and months too. Similarly, we can create an Hours counter for counting hours, incrementing when 60 minutes have passed. To count minutes, we can implement another Minutes counter which increments when 60 seconds have passed. When this counter reaches the value of the clock frequency, 100 million for example, we know that a second has passed and it’s time to increment another counter. To count seconds in VHDL, we can implement a counter that counts the number of clock periods which passes. This blog post is part of the Basic VHDL Tutorials series.
Therefore, if we know that the clock frequency is 100 MHz, we can measure one second by counting a hundred million clock cycles. Every digital design has access to a clock signal which oscillates at a fixed, known frequency. The answer is simply counting clock cycles. So how can we keep track of time in a design module? That only works in simulation because we can’t just tell the electrons in a circuit to pause for a given time. But what about production modules? The wait for statement cannot be used for that. I have no idea what I am doing wrong.In earlier tutorials we have used the wait for statement to delay time in simulation. Please if anyone has any advice, no matter how irelevant it may seem, please let me know. ini file is not altered and the new libraries do not appear in the file. # C:/modeltech_pe_6.5a/win32pe/vcom failed.Īlso when I execute the vmap command the. # ** Error: (vcom-19) Failed to access library 'd:/9.0/modelsim/libs/altera/vhdl/altera' at "d:/9.0/modelsim/libs/altera/vhdl/altera". # Model Technology ModelSim PE vcom 6.5a Compiler 2009.03 Mar 27 2009 I can do a refresh and modelsim seems to compile the librraies without any problems, but when I click on the '+' sign, and try to recompile the individual entities and packages I recieve the following error: Modelsim reponds with :Modifying C:/Documents and Settings/fcassidy/Mis documentos/Atlante/ATLANTE_Glue_Logic_FPGA/simulation/modelsim/Atlante_Glue_logic_FPGA_Functional_Sim.mpfĪnd the librray appears on the list. (which is where this particulat library resides) Vmap altera C:/altera/90/modelsim_ase/altera/vhdl/altera To map the relevant libraries I have typed into modelsim: I have still been trying to fix this issue and have tried various things, I am going to let you know what i have been trying and hopefully it may trigger an idea with someone.
#Modelsim altera 9.0 download
Does anybody know where I can download the libraries for Altera to use with the latest version of Quartus and Altera. I downloaded the modelsim altera edition so that I could get the relevant libraries. I am 3 days with this issue and don´t know what else to try, I´m totally lost.ĮDIT: When I attempt to recompile modelsim seems to be looking for the DVD drive (but the files all seem to be on the hard drive). I believe it may have something to do with the libraries. I arrived at this point trying to debug anothe problem where a PLL won´t work. I don´t understand why modelsim is looking here since I have the actual library mapped t:Ĭ:/altera/90/modelsim_ase/altera/vhdl/altera_mf * Error: (vcom-19) Failed to access library 'd:/9.0/modelsim/libs/altera/vhdl/altera_mf' at "d:/9.0/modelsim/libs/altera/vhdl/altera_mf". When I expand the library and look at the various entities and packages, if I click recompile I reciever an error saying: I have a library called "altera_mf" which I have mapped to the correct location on the hard drive.
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