how to create memory model using vr_ad

Hi Srik.

Have you used vr_ad at all before? If not, I suggest you read the documentation and look at the examples that come with vr_ad.
The vr_ad (and the documentation) is part of IPCM, so get that first if you don't have it.

vr_ad lets you model really simple sparse memories by default, and also lets you overlay an e struct onto the memory, to give you a structured way to address the memory.

I've pasted a snippet from the IPCM6.1 docs to get you started:

To instantiate a memory:

   1. Extend vr_ad_mem_kind, and add a new kind (according to eRM naming conventions).

      For example, you could add the kind EX_MEM as follows:
      extend vr_ad_mem_kind : [EX_MEM];
   2. Extend the relevant unit by adding a field of the specific vr_ad_mem subtype, and constrain the memory to the appropriate size.

      For example, you could set a 1Kx64 memory as follows:
      extend ACTIVE SLAVE vr_xbus_agent {
          mem : EX_MEM vr_ad_mem;
              keep mem.size == 0x1024;
              keep mem.addressing_width_in_bytes == 8;
      };

   3. Add the memory to the address space using add_with_offset() (same as adding a register file)

      For example, assuming that the memories of the slaves are mapped in consecutive addresses, you could map all active XBus slaves as follows:
      extend vr_xbus_env {
          post_generate() is also {
              for each (slave) in active_slaves {
                  addr_map.add_with_offset(index*1000,slave.mem);   
              };
          };
      };


Hope this helps!

Steve.

Originally posted in cdnusers.org by stephenh

Hi Srik.

Have you used vr_ad at all before? If not, I suggest you read the documentation and look at the examples that come with vr_ad.
The vr_ad (and the documentation) is part of IPCM, so get that first if you don't have it.

vr_ad lets you model really simple sparse memories by default, and also lets you overlay an e struct onto the memory, to give you a structured way to address the memory.

I've pasted a snippet from the IPCM6.1 docs to get you started:

To instantiate a memory:

   1. Extend vr_ad_mem_kind, and add a new kind (according to eRM naming conventions).

      For example, you could add the kind EX_MEM as follows:
      extend vr_ad_mem_kind : [EX_MEM];
   2. Extend the relevant unit by adding a field of the specific vr_ad_mem subtype, and constrain the memory to the appropriate size.

      For example, you could set a 1Kx64 memory as follows:
      extend ACTIVE SLAVE vr_xbus_agent {
          mem : EX_MEM vr_ad_mem;
              keep mem.size == 0x1024;
              keep mem.addressing_width_in_bytes == 8;
      };

   3. Add the memory to the address space using add_with_offset() (same as adding a register file)

      For example, assuming that the memories of the slaves are mapped in consecutive addresses, you could map all active XBus slaves as follows:
      extend vr_xbus_env {
          post_generate() is also {
              for each (slave) in active_slaves {
                  addr_map.add_with_offset(index*1000,slave.mem);   
              };
          };
      };


Hope this helps!

Steve.

Originally posted in cdnusers.org by stephenh