Remove FSL from Tumbl completely

[fpga/lx-cpu1/tumbl.git] / hw / core_ctrl.vhd

diff --git a/hw/core_ctrl.vhd b/hw/core_ctrl.vhd
index 596bc223f0f82760ae34525687f37616f494caf7..ebc8049ba5a99856af7428ae8195922fc91bd663 100644 (file)
--- a/hw/core_ctrl.vhd
+++ b/hw/core_ctrl.vhd
@@ -51,9 +51,6 @@ ENTITY core_ctrl IS
         -- mem pipeline register
         MEM_REG_i       :  IN MEM_REG_Type;
         MEM_REG_o       : OUT MEM_REG_Type;
-        -- FSL to mem data delay register(s)
-        FSL_S2MEM_REG_i :  IN FSL_S2MEM_Type;
-        FSL_S2MEM_REG_o : OUT FSL_S2MEM_Type;
         -- decode control i/o
         ID2CTRL_i       :  IN ID2CTRL_Type;
         INT_CTRL_o      : OUT INT_CTRL_Type;
@@ -71,7 +68,6 @@ ENTITY core_ctrl IS
         MSR_o           : OUT MSR_Type;
         -- miscellaneous
         MEM2CTRL_i      :  IN MEM2CTRL_Type;
-        FSL_nStall_i    :  IN STD_LOGIC;
         done_o          : OUT STD_LOGIC
         );
 END ENTITY core_ctrl;
@@ -99,9 +95,6 @@ ARCHITECTURE rtl OF core_ctrl IS
     SIGNAL setup_int_r    : STD_LOGIC;
     SIGNAL int_busy_r     : STD_LOGIC;
 
-    SIGNAL S_Data_r       : STD_LOGIC_VECTOR (31 DOWNTO 0);
-    SIGNAL S_Data_2r      : STD_LOGIC_VECTOR (31 DOWNTO 0);
-
 
 BEGIN
 
@@ -110,7 +103,7 @@ BEGIN
     pc_ctrl_o      <= NOT rst_r;
     imem_addr_o    <= IF2ID_REG_i.program_counter;
     -- clock/wait control lines
-    clken_s        <= (MEM2CTRL_i.clken AND FSL_nStall_i) OR rst_i;
+    clken_s        <= MEM2CTRL_i.clken OR rst_i;
     clken_pipe_s   <= clken_s AND (NOT HAZARD_WRB_i.hazard);
     imem_clken_o   <= clken_pipe_s;
     gprf_clken_o   <= clken_s;
@@ -126,8 +119,6 @@ BEGIN
     INT_CTRL_o.setup_int   <= setup_int_r;
     INT_CTRL_o.rti_target  <= ID2EX_REG_r.program_counter;
     INT_CTRL_o.int_busy    <= int_busy_r;
-    --
-    FSL_S2MEM_REG_o.S_Data <= S_Data_2r;
 
 regd_proc:
     PROCESS ( clk_i, rst_i, halt_i,
@@ -136,7 +127,7 @@ regd_proc:
               flush_ID2EX_s, flush_EX2MEM_s, HAZARD_WRB_i,
               MEM_REG_i, ID2CTRL_i, int_i, MSR_i,
               int_busy_r, delayBit_r, IMM_LOCK_i, ID2EX_REG_i, ID2EX_REG_r,
-              EX2IF_REG_i, EX_WRB_i, S_Data_r, FSL_S2MEM_REG_i, EX2MEM_REG_i )
+              EX2IF_REG_i, EX_WRB_i, EX2MEM_REG_i )
 
         -- some local procedures
         PROCEDURE lp_rst_IF2ID_REG IS
@@ -162,10 +153,6 @@ regd_proc:
             ID2EX_REG_r.mem_Action       <= NO_MEM;
             ID2EX_REG_r.transfer_Size    <= WORD;
             ID2EX_REG_r.wrb_Action       <= NO_WRB;
-            ID2EX_REG_r.FSL_Test         <= '1';
-            ID2EX_REG_r.FSL_Non_blocking <= '1';
-            ID2EX_REG_r.FSL_Control      <= '0';
-            ID2EX_REG_r.FSL_Atomic       <= '0';
         END PROCEDURE;
 
         PROCEDURE lp_rst_EX2IF_REG IS
@@ -184,12 +171,6 @@ regd_proc:
             EX2MEM_REG_o.wrix_rD     <= (OTHERS => '0');
         END PROCEDURE;
 
-        PROCEDURE lp_rst_FSL2MEM_REG IS
-        BEGIN
-            S_Data_r  <= (OTHERS => '0');
-            S_Data_2r <= (OTHERS => '0');
-        END PROCEDURE;
-
         PROCEDURE lp_rst_IMM_LOCK IS
         BEGIN
             IMM_LOCK_r.locked   <= '0';
@@ -200,7 +181,6 @@ regd_proc:
         BEGIN
             MSR_o.IE  <= '0';
             MSR_o.C   <= '0';
-            MSR_o.FSL <= '0';
         END PROCEDURE;
 
         PROCEDURE lp_rst_EX_WRB IS
@@ -234,7 +214,6 @@ regd_proc:
                 lp_rst_MSR;
                 lp_rst_HAZARD_WRB;
                 lp_rst_MEM_REG;
-                lp_rst_FSL2MEM_REG;
                 delayBit_r    <= '0';
                 flush_ID2EX_r <= '0';
                 setup_int_r   <= '0';
@@ -283,8 +262,6 @@ regd_proc:
                     EX2IF_REG_r <= EX2IF_REG_i;
                     delayBit_2r <= delayBit_r;
                     EX_WRB_o    <= EX_WRB_i;
-                    S_Data_2r   <= S_Data_r;
-                    S_Data_r    <= FSL_S2MEM_REG_i.S_Data;
                 END IF;
                 IF (clken_s = '1') THEN
                     -- next test to prevent a flush from disrupting