matthias/2d_display_engine-new
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- Corrected write timing

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This commit is contained in:
Matthias Blankertz
2013-03-02 12:29:07 +01:00
parent c04775d4a7
commit cac9a8a60f
1 changed files with 6 additions and 6 deletions
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12
src/wb_ddr_ctrl_wb_dc_fsm.vhd
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@@ -70,7 +70,7 @@ constant ctrl_command_read : std_logic_vector(2 downto 0) := "110";
-- DDR-side FSM -- DDR-side FSM
type ctrl_states is (S_RESET, S_INITIALIZE, S_WAITINITDONE, S_IDLE, S_REFRESH, S_REQUEST_INIT, S_WRITE1, type ctrl_states is (S_RESET, S_INITIALIZE, S_WAITINITDONE, S_IDLE, S_REFRESH, S_REQUEST_INIT, S_WRITE1,
S_WRITE2, S_WRITE3, S_WRITE4, S_WRITE_END1, S_WRITE_END2, S_READ1, S_READ2, S_WRITE2, S_WRITE3, S_WRITE_END1, S_WRITE_END2, S_WRITE_END3, S_READ1, S_READ2,
S_READ3, S_READ4, S_READ5, S_READ_END1, S_READ_END2); S_READ3, S_READ4, S_READ5, S_READ_END1, S_READ_END2);
signal ctrl_state : ctrl_states := S_RESET; signal ctrl_state : ctrl_states := S_RESET;
signal burst_start_adr : std_ulogic_vector(12 downto 0) := (others => '-'); signal burst_start_adr : std_ulogic_vector(12 downto 0) := (others => '-');
@@ -143,13 +143,13 @@ ctrl_fsm_state : process(ddr2_clk180)
ctrl_state <= S_WRITE3; ctrl_state <= S_WRITE3;
end if; end if;
when S_WRITE3 => when S_WRITE3 =>
ctrl_state <= S_WRITE4;
when S_WRITE4 =>
ctrl_state <= S_WRITE2; ctrl_state <= S_WRITE2;
when S_WRITE_END1 => when S_WRITE_END1 =>
ctrl_state <= S_WRITE_END2; ctrl_state <= S_WRITE_END2;
when S_WRITE_END2 => when S_WRITE_END2 =>
ctrl_state <= S_WRITE_END3;
when S_WRITE_END3 =>
if ctrl_cmd_ack = '0' then if ctrl_cmd_ack = '0' then
ctrl_state <= S_IDLE; ctrl_state <= S_IDLE;
end if; end if;
@@ -243,7 +243,7 @@ ctrl_fsm_out : process(ctrl_state, ddr2_reset, we, ctrl_cmd_ack, fifo_from_sys_v
if fifo_from_sys_valid = '0' or row_addr /= burst_start_adr or if fifo_from_sys_valid = '0' or row_addr /= burst_start_adr or
we = '0' or ctrl_auto_ref_req = '1' then we = '0' or ctrl_auto_ref_req = '1' then
-- next request incompatible with burst type, or auto refresh requested -- next request incompatible with burst type, or auto refresh requested
ctrl_burst_done_d <= '1';
else else
ddr_dmask_en <= '1'; ddr_dmask_en <= '1';
ddr_dout_en <= '1'; ddr_dout_en <= '1';
@@ -257,11 +257,11 @@ ctrl_fsm_out : process(ctrl_state, ddr2_reset, we, ctrl_cmd_ack, fifo_from_sys_v
ddr_dout_high <= '1'; ddr_dout_high <= '1';
ddr_address_en <= '1'; ddr_address_en <= '1';
ctrl_command_register_d <= ctrl_command_write; ctrl_command_register_d <= ctrl_command_write;
when S_WRITE4 =>
ctrl_command_register_d <= ctrl_command_write;
fifo_from_sys_read_int <= '1'; fifo_from_sys_read_int <= '1';
when S_WRITE_END1 => when S_WRITE_END1 =>
ctrl_burst_done_d <= '1'; ctrl_burst_done_d <= '1';
when S_WRITE_END2 =>
ctrl_burst_done_d <= '1';
when S_READ1 => when S_READ1 =>
ctrl_command_register_d <= ctrl_command_read; ctrl_command_register_d <= ctrl_command_read;