Hi,
I am a verification engineer and have been using OSVVM since a few months. I find it really useful and pretty practical.
Right now I am verifying an SPI design with a self-checking testbench, and have a problem with memory allocation for storing the random driver signals. Currently I am using VHDL Access variable and build a linked list with it, which seems very neat. The linked list built from the drivers will be checked in the comparator at the end of the simulation by comparing the driver’s list and the predictor’s list in no time.
But the problem is, in an Access variable, only 16-bit (65535) elements are supported. If I tried to allocate new memory after that, it will point back to the first location. Here is a simple example:
type data_type;
type data_list is access data_type;
type data_type is record
value: integer;
end record;
...
process
begin
data_list := new data_type;
while simulation = '1' loop
wait until rising_edge(clk);
value:= value+1;
data_list.value := value;
data_list.next_el:= new data_type;
data_list := data_list.next_el;
end loop;
end process;
My question is, is there a way to “outsmart” this memory limit? Or is there a better, faster, more efficient way to store those stimulus, and at the same time flexible to be used in the comparator?
Thanks in advance.
Best regards,
Louis
.
