cast from sc_ufixed to int in systemC

[Andreas]

Hi!

I'm working with systemC to realize a processor like structure.

I have a signed variable (RAM) declared after the systemC syntax
"sc_ufixed<32,32> RAM".

I also have an signed integer in my testbench, "int myIplImage.depth".

If I give this unsigned RAM the value of a signed variable
myIplImage.depth in my testbench,
::RAM[100] = myIplImage.depth;
the bit pattern is transferred.

But when I do it the other way around,
::myIplImage.depth = RAM[100];
to extract my results back to the testbench, the contest is messed up
since the RAM keeps a "bigger" value (since it's unsigned) then what
will fit into the signed variable "myIplImage.depth".

How can I transfer the unsigned value of my RAM back to the signed
variable in my testbench? (I like to do this in a bit wise matter,
just transfer the bit pattern.)

(PS. myIplImage.depth = (signed int)RAM[100] does not work...)

best regards,
Andreas Lundgren

 

[Eyck Jentzsch]

Andreas wrote:

Hi!

I'm working with systemC to realize a processor like structure.

I have a signed variable (RAM) declared after the systemC syntax
"sc_ufixed<32,32> RAM".

I also have an signed integer in my testbench, "int myIplImage.depth".

If I give this unsigned RAM the value of a signed variable
myIplImage.depth in my testbench,
::RAM[100] = myIplImage.depth;
the bit pattern is transferred.

But when I do it the other way around,
::myIplImage.depth = RAM[100];
to extract my results back to the testbench, the contest is messed up
since the RAM keeps a "bigger" value (since it's unsigned) then what
will fit into the signed variable "myIplImage.depth".

How can I transfer the unsigned value of my RAM back to the signed
variable in my testbench? (I like to do this in a bit wise matter,
just transfer the bit pattern.)

(PS. myIplImage.depth = (signed int)RAM[100] does not work...)

best regards,
Andreas Lundgren
If I'm not totally wrong you declare a fixpoint variable with 32 bits

and access bit 100, this should result in garbage...
the following should work:
RAM=myIplImage.depth;
myIplImage.depth=RAM.to_int();
or:
myIplImage.depth=(int)RAM.double();
HTH

-Eyck