Question about simulation of VIP cores

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Hi,

I'm doing a simulation of Clocked Video Input with Altera-Modelsim using NativeLink, but it seems the IP cores doesn't respond to my testbench as the attachment below, while I have successfully simulated the reconfiguration of altera's pll.

My question is that if the VIP cores support simulation or not, are there any differences between simulation of CVI and PLL?

Thanks for reply!

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Hi,

how does your testbench lookslike ?

Kind regards

GPK

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Hi,

how does your testbench lookslike ?

Kind regards

GPK

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Hi, GPK

I have attached my testbench, thanks for help!

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Hi, GPK

I have attached my testbench, thanks for help!

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Hi,

are you using a synchronous reset ? It looks to me that in your testbench the clocks starts after releasing the reset.

Kind regards

GPK

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Hi,

are you using a synchronous reset ? It looks to me that in your testbench the clocks starts after releasing the reset.

Kind regards

GPK

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Hi, GPK

As quoted from the VIP user guide, "The MegaCore function is asynchronously reset when rst is asserted high. The reset must be de-asserted synchronously with respect to the rising edge of the is_clk signal."

And I have commented the delay for the clocks initial as below, but it still doesn't work.

Thanks again!

initial

begin

dclk_in = 0;

//#120;

forever# 25 dclk_in = ~dclk_in;

end

initial

begin

sys_clk = 0;

//#120;

forever# 5 sys_clk = ~sys_clk;

end

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Hi, GPK

As quoted from the VIP user guide, "The MegaCore function is asynchronously reset when rst is asserted high. The reset must be de-asserted synchronously with respect to the rising edge of the is_clk signal."

And I have commented the delay for the clocks initial as below, but it still doesn't work.

Thanks again!

initial

begin

dclk_in = 0;

//#120;

forever# 25 dclk_in = ~dclk_in;

end

initial

begin

sys_clk = 0;

//#120;

forever# 5 sys_clk = ~sys_clk;

end

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Hi,

to be honest I was not convinced that the reset is the root cause, but you never know ....

In my experience HiZ often means that nothing is connected to the outputs. Do run a complete Quartus P&R. If yes did you some strange messages that something is missing ??? Or have your core tri-state capable outputs ?

Kind regards

GPK

--- Quote Start ---

Hi,

to be honest I was not convinced that the reset is the root cause, but you never know ....

In my experience HiZ often means that nothing is connected to the outputs. Do run a complete Quartus P&R. If yes did you some strange messages that something is missing ??? Or have your core tri-state capable outputs ?

Kind regards

GPK

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Hi, GPK

Yes, I did P&R, but no strange messages turned out. Do you have any other suggestions?

Thanks again.

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Hi, GPK

Yes, I did P&R, but no strange messages turned out. Do you have any other suggestions?

Thanks again.

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Hi,

is it possible for you to look deeper into the IP block, in order to find out whether there are parts of the block running ?

BTW: I found this remark in the documentation

RTL Simulation Reports Errors When Using Verilog HDL

EDA RTL simulation started from the Quartus II software reports errors in the

ModelSim® simulator for designs containing Video and Image Processing Suite

MegaCore functions when the output files are in Verilog HDL.

Affected Configurations

This issue affects configurations that use NativeLink to run a ModelSim simulation

from Verilog HDL.

Design Impact

An error message reports that software cannot find the Altera library.

Workaround

Compile the file db/alt_cusp90_package.vhd to the Altera library. To perform this

compilation, modify the top-level .do script in the simulation/modelsim directory.

Solution Status

This issue will be fixed in a future version of the Video and Image Processing Suite.

Kind regards

GPK