system: Remember to wire the DCache to the memory!
[firearm.git] / Memory.v
index 4af216d..e10a2e7 100644 (file)
--- a/Memory.v
+++ b/Memory.v
@@ -22,6 +22,7 @@ module Memory(
        input [31:0] insn,
        input [31:0] op0,
        input [31:0] op1,
+       input [31:0] op2,
        input write_reg,
        input [3:0] write_num,
        input [31:0] write_data,
@@ -36,11 +37,11 @@ module Memory(
        output reg [31:0] out_write_data = 32'hxxxxxxxx
        );
 
-       reg [31:0] addr, raddr, next_regdata;
-       reg [3:0] next_regsel;
-       reg next_writeback, next_notdone, next_inc_next;
+       reg [31:0] addr, raddr;
+       reg 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;
@@ -54,10 +55,10 @@ module Memory(
        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;
@@ -77,12 +78,14 @@ module Memory(
                next_write_num = write_num;
                next_write_data = write_data;
                next_inc_next = 1'b0;
+               next_outbubble = inbubble;
                outstall = 1'b0;
                
                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 */
@@ -98,8 +101,7 @@ module Memory(
                                align_rddata = insn[22] ? {24'b0, align_s2[7:0]} : align_s2;
                                
                                if(!insn[20]) begin
-                                       st_read = insn[15:12];
-                                       wr_data = insn[22] ? {4{st_data[7:0]}} : st_data; /* XXX need to actually store just a byte */
+                                       wr_data = insn[22] ? {4{op2[7:0]}} : op2; /* XXX need to actually store just a byte */
                                end
                                else if(!inc_next) begin
                                        next_write_reg = 1'b1;
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