diff options
Diffstat (limited to 'sdram_ctrl.vhd')
| -rw-r--r-- | sdram_ctrl.vhd | 10 |
1 files changed, 4 insertions, 6 deletions
diff --git a/sdram_ctrl.vhd b/sdram_ctrl.vhd index 58064bd..b0b4a1f 100644 --- a/sdram_ctrl.vhd +++ b/sdram_ctrl.vhd @@ -149,7 +149,7 @@ architecture rtl of sdram_ctrl is signal request_dqm : dqm_t; -- read state logic - signal r_data_valid: std_logic_vector(2 downto 0); + signal r_data_valid: std_logic_vector(3 downto 0); -- bus logic signal post_request: std_logic; @@ -532,8 +532,8 @@ begin if l2b_al(reset_n) then r_data_valid <= (others => '0'); elsif rising_edge(clock) then - r_data_valid(1 downto 0)<=r_data_valid(2 downto 1); - r_data_valid(2) <= b2l_ah(mem_cmd = MEM_CMD_READ); + r_data_valid(2 downto 0)<=r_data_valid(3 downto 1); + r_data_valid(3) <= b2l_ah(mem_cmd = MEM_CMD_READ); end if; end process; @@ -576,7 +576,6 @@ begin if not l2b_ah(request_pending) then -- the logic has pushed the request to the ram if l2b_al(request_rnw) then - bus_wait_n <= '1'; -- if it's a write we're all done b_state <= B_ST_WAIT_CS_N_HIGH; else @@ -589,14 +588,13 @@ begin if l2b_ah(r_data_valid(0)) then bus_data_out <= mem_data_in; -- bus_data_out <= request_addr(15 downto 0); - bus_wait_n <= '1'; b_state <= B_ST_WAIT_CS_N_HIGH; end if; elsif b_state = B_ST_WAIT_CS_N_HIGH then b_debug(6 downto 0) <= DEBUG_5; b_debug(7) <='1'; + bus_wait_n <= '1'; if not l2b_al(bus_cs_n) then - bus_wait_n <= '0'; b_state <=B_ST_WAIT_CS_N_LOW; end if; else |