ISE simulator v/s Modelsim

[rsabhilash]

Actually there was a problem in my code.
We have to wait 100 ns for global reset to finish.The stimulus are supplied after 100ns.But I fired them before 100ns.When I delayed the stimulus by 100ns there was data in dout.
Wrapper file fifo.v is sufficient for simulation in ISIM .
Thanks for your help

 

[imbichie]

ya its possible to view all the signals, in modelsim its doing by typing the command

"add wave -r /* ", try to find it in yours simulator and view it

 

[rsabhilash]

The command "add wave -r /* " does not work for ISIM.
But in the tab Sim objects all the internal signals are preset and can be added to the waveform window by just drag & drop.

 

[imbichie]

then do it and Check whether the FIFO write is working good or not

 

[rsabhilash]

hello,
It's working well.Now I can watch internal signals.

 

[imbichie]

means your FIFO write going properly,

if the FIFO write is going properly then why the FIFO empty flag is high always. the empty flag high means FIFO is empty na, how it happened

 

[rsabhilash]

That's old waveform.Now empty flag goes low

 

[imbichie]

can you write more data in to the fifo and check whether the FIFO full flag is high, after FIFO ful you just read the FIFO, i think it may be work

 

[rsabhilash]

I checked it.When data written became greater than it's depth then full flags goes high.
On reading one data from the full fifo the full flag goes low.

 

[imbichie]

is the read data available in the dout

 

[rsabhilash]

Now data is available at output while I make rd_en high.

 

[imbichie]

so your problem solved na

 

[rsabhilash]

Ya,I think so.Now I started the simulation of tri_mode_eth_mac (IP core from XIlinx)

 

[imbichie]

best wishes