VGADisplay/src/vram_ctrl.nsl

   1 /**
   2 *       VRAM Control Module
   3 *       Module name is "vram_ctrl"
   4 *       @author zyanham
   5 *       @version 1.0
   6 *       Comment : Reading Steiner
   7 */
   8
   9 #include "vram.nsh"
  10
  11 declare vram_ctrl {
  12
  13         input    i_Wdata[8] ;   // in Write Data
  14         input    i_Wadrs[14] ;  // in Write Address
  15         input    i_Radrs[14] ;  // in Read Address
  16         output   o_Rdata[8] ;   // out Read Data
  17
  18         func_in  fi_Wr_req( i_Wadrs, i_Wdata ) ;
  19         func_in  fi_Rd_req( i_Radrs ) ;
  20         func_out fo_Rd_ack( o_Rdata ) ;
  21 }
  22 module vram_ctrl{
  23         vram u_VRAM ;
  24
  25         reg r_Radrs_hld[14] = 0 ;
  26
  27         {
  28                 /* Memory Terminal Assign */
  29
  30                 if(~fi_Wr_req) {
  31                         u_VRAM.we       = 0 ;
  32                 }
  33         }
  34
  35         func fi_Wr_req {
  36                 u_VRAM.we       = 1 ;
  37                 u_VRAM.d        = i_Wdata ;
  38                 u_VRAM.wa       = i_Wadrs ;
  39         }
  40
  41         func fi_Rd_req seq {
  42                         u_VRAM.ra = i_Radrs ;
  43                 {
  44                         u_VRAM.ra = r_Radrs_hld ;
  45                         fo_Rd_ack( u_VRAM.q ) ;
  46                 }
  47         }
  48 }