Memory: Add coprocessor interface stub.

[firearm.git] / Memory.v

diff --git a/Memory.v b/Memory.v
index 3f82a5419cafbd21ec1a2e2b9d19ed81e132153d..04220ca93cb649060c286c1e9e96806ce1168f8c 100644 (file)
--- a/Memory.v
+++ b/Memory.v
@@ -16,6 +16,11 @@ module Memory(
        output reg [3:0] st_read,
        input [31:0] st_data,
        
+       /* Coprocessor interface */
+       output reg cp_req,
+       input cp_ack,
+       input cp_busy,
+       
        /* stage inputs */
        input inbubble,
        input [31:0] pc,
@@ -42,6 +47,7 @@ module Memory(
        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;
@@ -56,10 +62,10 @@ 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;
@@ -81,14 +87,17 @@ module Memory(
                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;
+               cp_req = 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 */