Re: error using Altera FIFO megafunction

Altera_Forum · ‎01-26-2012

Hello.

i've configured FIFO megafunc in such way as on img1

then i've tried to test its operating

in such way


module incomingCMD ();
  
  tri0 FULL, EMPTY, CLR, Q;
  tri0 CMD;
  tri0  USEDW;
  reg CLK, RDREQ, WRREQ;
  
  reg  command;
  
  assign CMD = command;
  assign CLR = 0'b0;
  
  initial
  begin
    CLK <= 0'b1;
    RDREQ <= 0'b0;
    WRREQ <= 0'b1;
  end
  
  always 
  begin
   # 10 CLK <= ~ CLK;
  end
  
  initial
  begin
   # 20 command <= 0'b1; 
   # 30 command <= 0'b0;
   # 50 command <= 0'b1;
   # 70 command <= 0'b0;
   # 90 command <= 0'b1;
   # 20 command <= 0'b0;
   # 70 command <= 0'b1;
   # 10 command <= 0'b0;
   # 50 command <= 0'b1;
   # 80 command <= 0'b0;
   # 20 command <= 0'b1;
   # 40 WRREQ <= 0'b0;
   # 20 RDREQ <= 0'b1;
  end
  
  fifoCMD cmdSroradgeDevice (
	.clock(CLK),
	.data(CMD),
	.rdreq(RDREQ),
	.sclr(CLR),
	.wrreq(WRREQ),
	.empty(EMPTY),
	.full(FULL),
	.q(Q),
	.usedw(USEDW));
endmodule

but i'got unexpected result my FIFO looks like dead. Sim on img2

Tell, me please my mistake...

And also one more question.. I'm going to write a controller SD Card R/W. SD uses CMD line both to get seriall commands and to response it. Thus i would like to know what is the best way to provide this relation. Am i right that trying to get responses in FIFO and than compare with command meanings ? Or there is some more comfortable way to do it?

Altera_Forum · ‎01-31-2012

The reason is ModelSim can't find or open "entity SCFIFO" from library altera_mf.


vsim rtl_work.fifo1
#  vsim rtl_work.fifo1 
#  Loading rtl_work.fifo1
#  ** Error: (vsim-3033) C:/StoreDev/Altera/incDevFIRBUp4_FIFO/fifo1.v(79): Instantiation of 'scfifo' failed. The design unit was not found.
#          Region: /fifo1
#          Searched libraries:
#              C:\StoreDev\Altera\incDevFIRBUp4_FIFO\simulation\modelsim\rtl_work
#  Error loading design

I'm using ModelSim Starter 10c and QII 11.1. According to version.txt they are compatible, but i still have a problem...

How can i directly put a link to "entity SCFIFO" in ModelSim

Altera_Forum · ‎01-31-2012

As i understand i'm using Windows7 and there is some incompatibility with ModelSim because it cant use library. How can i solve this problem?

Altera_Forum · ‎01-31-2012

the fifo model should be in a library called altera_mf. are you using ModelSim-A(S)E?

Altera_Forum · ‎01-31-2012

and i haven't run into any sim issues on Windows 7

Altera_Forum · ‎02-01-2012

Yes, i'm using ModelSim Altera Starter E 10c

Altera_Forum · ‎02-02-2012

As i see there is some misunderstanding on my part during simulation megafunctions...

i tried to find the answer in

http://www.altera.com/literature/hb/qts/qts_qii53001.pdf

http://www.altera.com/literature/hb/qts/qts_qii53025.pdf

but there is still some misunderstandind

is it correct sequence of operations to sim projects with altera mf?

1. create QII proj

2. create megafunction

3. compile proj

4. open modelsim

5. create modelsim proj

6. add to proj megafunction wizard generated file

6. create hdl file where mf used

7. add through file properties to mf file library file (C:\Altera\11.1sp1\modelsim_ase\altera\verilog\src\altera_mf)

8. compile

9. simulate

in this way it works... is it correct??

Altera_Forum · ‎02-02-2012

i normally use NativeLink to generate a sim script and edit to taste, but your steps sound more involved than necessary

either try NativeLink or try to just vlog your design files and test bench then run vsim. the fifo should reference the altera_mf library on its own