ASIC/FPGA Design and Verification Out Source Services

A memory model, for VHDL design, build in c code and Glib.

1. This code is written with the help of this tutorial as well as on some examples in this web site:
   GHDL c interfaces,
   A very simple example to Manage C data.
   


2. This example is made of three files: makefile, vhdl test-bench and c code for memory model.


3. Makefiles are discussed in this web site and this one follows the same guide lines:
   random number generation.
   GHDL c interfaces.
   
   As in the former cases the makefile supports run, with and without VCD waves as well as GDB invokation:
   make run
   make run GDB=gdb
   make vcd
   
   This makefile passes different switches to the compiler and linker:
   GLIBCC = -I/usr/include/glib-2.0 -I/usr/lib/i386-linux-gnu/glib-2.0/include
   GLIBLL = -lglib-2.0
   ...
   EFLAGS = -m -Wl,mem_model.o -Wl,$(GLIBLL)
   ...
   .PHONY : tb_vec
   tb_vec : work-obj93.cf
     $(GG) $(EFLAGS) --workdir=work --ieee=synopsys tb_vec
   ...
   


4. The c code uses Glib. Parts of the code is listed below:
   
   
   1. ...
   2. #include <glib.h>;
   3. ...
   4. //memory model
   5. typedef struct {
   6.   int addr;
   7.   int data;
   8. } c_mem_model;
   11. GSList* list = NULL;
   12. int mem_arr_44_wr_c(int mem_free, int addr, struct ghdl_string *s) {
   13. ...
   14.   //memory model
   15.   GSList* iterator = NULL;
   16.   c_mem_model* t_mem = NULL;
   18.   //memory free
   19.   if(mem_free == 1) {
   20.     if(g_slist_length(list) > 0) {
   21.       g_slist_free(list);
   22.       g_free(t_mem);
   23.     }
   24.     return 0;
   25.   }
   26. ...
   27.   //update memory
   28.   //if already exists, update.
   29.   for (iterator = list; iterator; iterator = iterator->next) {
   30.     if( ((c_mem_model*)iterator->data)->addr == addr ) {
   31.       flg = 1;
   32.       ((c_mem_model*)iterator->data)->data = res;
   33.       break;
   34.     }
   35.   }
   36.   //new entry
   37.   if(flg == 0) {
   38.     t_mem = g_new(c_mem_model, 1);//allocate
   39.     t_mem->addr = addr;
   40.     t_mem->data = res;
   41.     list = g_slist_append(list, t_mem);
   42.   }
   43. ...


5. For more info send mail with the subject c code memory model using Glib.