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  • Fatal Error bad reference

Fatal Error bad reference

UVM 6660
#uvm 278
xfinity
xfinity
Full Access
52 posts
October 13, 2020 at 1:45 pm

Hi All,

I got this Fatal error while running a sim :
** Fatal: (SIGSEGV) Bad handle or reference.

Fatal error in Module spi_if at /***/***/***/spi_if.sv line 651

I saw line 651 of the SPI interface i see this code :

always @(SCK)
begin
   if (curr_mode) begin
      MinData = spi_cfg.Mindr * DELAY_UNIT * 1ps;
   end
   else begin
#651      MinData = spi_cfg.Minsr * DELAY_UNIT * 1ps;
   end
end
 
spi_cfg is handle of class spi_agent_config   
spi_agent_config   spi_cfg;
 
The variable Minsr is defined as int in the class spi_agent_config 
 
Not sure what to debug in this case, any pointers 
 
Thanks,
Tejas

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dave_59
dave_59
Forum Moderator
10658 posts
October 13, 2020 at 1:53 pm

In reply to tejasakulu:

spi_cfg is not a class handle, it is a class variable that should hold a handle to a spi_agent_config object. Make sure you have assigned it and is not currently null.

— Dave Rich, Verification Architect, Siemens EDA

xfinity
xfinity
Full Access
52 posts
October 13, 2020 at 2:05 pm

In reply to dave_59:

Hi Dave :

Sorry i did not get that can you elaborate please

Thanks,
Tejas

dave_59
dave_59
Forum Moderator
10658 posts
October 13, 2020 at 2:28 pm

In reply to tejasakulu:
See http://go.mentor.com/class-on-classes

Have you constructed or assigned a handle to spi_cfg?

Add this line before line #651

if (spi_cfg == null) $fatal(1, "I was lazy and did not construct an object before trying to reference it");

— Dave Rich, Verification Architect, Siemens EDA

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