merge memory
authorChristopher Lu <lu@stop.hsd1.pa.comcast.net>
Tue, 6 Jan 2009 08:20:31 +0000 (03:20 -0500)
committerChristopher Lu <lu@stop.hsd1.pa.comcast.net>
Tue, 6 Jan 2009 08:20:31 +0000 (03:20 -0500)
1  2 
Memory.v

diff --combined Memory.v
+++ b/Memory.v
@@@ -37,17 -37,16 +37,18 @@@ module Memory
        output reg [31:0] out_write_data = 32'hxxxxxxxx
        );
  
 -      reg [31:0] addr, raddr;
 -      reg next_notdone, next_inc_next;
 +      reg [31:0] addr, raddr, next_regdata;
 +      reg [3:0] next_regsel, cur_reg, prev_reg;
 +      reg next_writeback, next_notdone, next_inc_next;
        reg [31:0] align_s1, align_s2, align_rddata;
  
+       wire next_outbubble;    
        wire next_write_reg;
        wire [3:0] next_write_num;
        wire [31:0] next_write_data;
  
        reg [15:0] regs, next_regs;
 +      reg started = 1'b0, next_started;
  
        reg notdone = 1'b0;
        reg inc_next = 1'b0;
        begin
                outpc <= pc;
                outinsn <= insn;
-               outbubble <= rw_wait;
-               out_write_reg <= next_writeback;
-               out_write_num <= next_regsel;
-               out_write_data <= next_regdata;
+               outbubble <= next_outbubble;
+               out_write_reg <= next_write_reg;
+               out_write_num <= next_write_num;
+               out_write_data <= next_write_data;
                notdone <= next_notdone;
                inc_next <= next_inc_next;
                regs <= next_regs;
 +              prev_reg <= cur_reg;
 +              started <= next_started;
        end
  
        always @(*)
                next_write_num = write_num;
                next_write_data = write_data;
                next_inc_next = 1'b0;
+               next_outbubble = inbubble;
                outstall = 1'b0;
 -              
 +              next_regs = 16'b0;
 +              next_started = started;
 +
                casez(insn)
                `DECODE_LDRSTR_UNDEFINED: begin end
                `DECODE_LDRSTR: begin
                        if (!inbubble) begin
+                               next_outbubble = rw_wait;
                                outstall = rw_wait | notdone;
                        
                                addr = insn[23] ? op0 + op1 : op0 - op1; /* up/down select */
                        end
                end
                `DECODE_LDMSTM: begin
 -                      busaddr = {op0[31:2], 2'b0};
                        rd_req = insn[20];
                        wr_req = ~insn[20];
 -                      casez(regs)
 -                      16'b???????????????1: begin
 -                              next_regs = regs;
 -                      end
 -                      16'b??????????????10: begin
 -                      end
 -                      16'b?????????????100: begin
 -                      end
 -                      16'b????????????1000: begin
 -                      end
 -                      16'b???????????10000: begin
 -                      end
 -                      16'b??????????100000: begin
 -                      end
 -                      16'b?????????1000000: begin
 -                      end
 -                      16'b????????10000000: begin
 +                      if(!started) begin
 +                              next_regs = op1[15:0];
 +                              next_started = 1'b1;
                        end
 -                      16'b???????100000000: begin
 -                      end
 -                      16'b??????1000000000: begin
 -                      end
 -                      16'b?????10000000000: begin
 -                      end
 -                      16'b????100000000000: begin
 -                      end
 -                      16'b???1000000000000: begin
 -                      end
 -                      16'b??10000000000000: begin
 -                      end
 -                      16'b?100000000000000: begin
 +                      else if(inc_next) begin
 +                              if(insn[21]) begin
 +                                      next_write_reg = 1'b1;
 +                                      next_write_num = insn[19:16];
 +                                      next_write_data = op0;
 +                              end
 +                              next_started = 1'b0;
                        end
 -                      16'b1000000000000000: begin
 +                      else if(rw_wait) begin
 +                              next_regs = regs;
 +                              cur_reg = prev_reg;
                        end
 -                      default: begin
 -                              next_inc_next = 1'b1;
 +                      else begin
 +                              casez(regs)
 +                              16'b???????????????1: begin
 +                                      cur_reg = 4'h0;
 +                                      next_regs = regs & 16'b1111111111111110;
 +                              end
 +                              16'b??????????????10: begin
 +                                      cur_reg = 4'h1;
 +                                      next_regs = regs & 16'b1111111111111100;
 +                              end
 +                              16'b?????????????100: begin
 +                                      cur_reg = 4'h2;
 +                                      next_regs = regs & 16'b1111111111111000;
 +                              end
 +                              16'b????????????1000: begin
 +                                      cur_reg = 4'h3;
 +                                      next_regs = regs & 16'b1111111111110000;
 +                              end
 +                              16'b???????????10000: begin
 +                                      cur_reg = 4'h4;
 +                                      next_regs = regs & 16'b1111111111100000;
 +                              end
 +                              16'b??????????100000: begin
 +                                      cur_reg = 4'h5;
 +                                      next_regs = regs & 16'b1111111111000000;
 +                              end
 +                              16'b?????????1000000: begin
 +                                      cur_reg = 4'h6;
 +                                      next_regs = regs & 16'b1111111110000000;
 +                              end
 +                              16'b????????10000000: begin
 +                                      cur_reg = 4'h7;
 +                                      next_regs = regs & 16'b1111111100000000;
 +                              end
 +                              16'b???????100000000: begin
 +                                      cur_reg = 4'h8;
 +                                      next_regs = regs & 16'b1111111000000000;
 +                              end
 +                              16'b??????1000000000: begin
 +                                      cur_reg = 4'h9;
 +                                      next_regs = regs & 16'b1111110000000000;
 +                              end
 +                              16'b?????10000000000: begin
 +                                      cur_reg = 4'hA;
 +                                      next_regs = regs & 16'b1111100000000000;
 +                              end
 +                              16'b????100000000000: begin
 +                                      cur_reg = 4'hB;
 +                                      next_regs = regs & 16'b1111000000000000;
 +                              end
 +                              16'b???1000000000000: begin
 +                                      cur_reg = 4'hC;
 +                                      next_regs = regs & 16'b1110000000000000;
 +                              end
 +                              16'b??10000000000000: begin
 +                                      cur_reg = 4'hD;
 +                                      next_regs = regs & 16'b1100000000000000;
 +                              end
 +                              16'b?100000000000000: begin
 +                                      cur_reg = 4'hE;
 +                                      next_regs = regs & 16'b1000000000000000;
 +                              end
 +                              16'b1000000000000000: begin
 +                                      cur_reg = 4'hF;
 +                                      next_regs = 16'b0;
 +                              end
 +                              default: begin
 +                                      cur_reg = 4'hx;
 +                                      next_regs = 16'b0;
 +                              end
 +                              endcase
 +                              next_inc_next = next_regs == 16'b0;
 +                              next_notdone = ~next_inc_next | (rw_wait & insn[20] & insn[21]);
                        end
 -                      endcase
                end
                default: begin end
                endcase
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