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[spi_flash_wb.vhd]

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- added caching

git-svn-id: http://moon:8086/svn/vhdl/trunk@1296 cc03376c-175c-47c8-b038-4cd826a8556b
This commit is contained in:
jens
2015-06-13 09:57:36 +00:00
parent f96a017bc7
commit c7eed7504d
2 changed files with 217 additions and 32 deletions
Download Patch File Download Diff File Expand all files Collapse all files
lib/spi/src/spi_flash_wb.vhd
+166 -32
View File
@@ -36,6 +36,8 @@ END spi_flash_wb;
ARCHITECTURE rtl OF spi_flash_wb IS
type state_t is (reset, idle, spi_cmd, spi_data, cache_fill_start, cache_fill, finish);
-- Signals for UART connections
signal mst_cmd : cmd_t;
signal mst_cmd_vld : std_logic;
@@ -50,22 +52,37 @@ ARCHITECTURE rtl OF spi_flash_wb IS
signal mst_dout : unsigned(31 downto 0);
signal mst_dout_re : std_logic;
signal mst_dout_vld : std_logic;
signal word_addr : unsigned(CACHE_ADDR_BITS-1 downto 0);
signal fill_addr : unsigned(CACHE_ADDR_BITS-1 downto 2);
signal data_ram_addr_rd : unsigned(CACHE_ADDR_BITS-1 downto 2);
signal word_addr_reg : unsigned(CACHE_ADDR_BITS-1 downto 2);
signal tag_we : std_logic;
signal tag_reg : unsigned(FLASH_ADDR_BITS-1 downto CACHE_ADDR_BITS);
signal tag_valid : std_logic;
signal tag_match : std_logic;
signal cache_miss : std_logic;
signal register_access : std_logic;
signal state : state_t;
signal state_next : state_t;
signal ACK_mem : std_logic;
signal ACK_reg : std_logic;
signal DAT_mem : unsigned(31 downto 0);
signal DAT_reg : unsigned(31 downto 0);
begin
mst_dout_re <= '1';
mst_shift_en <= not spi_hold;
SRDY_O <= CYC_I;
mst_cmd <= to_cmd(2080, 32);
mst_din <= X"03" & ADDR_I(FLASH_ADDR_BITS-1 downto CACHE_ADDR_BITS) & X"00";
INT_O <= '0';
tag_match <= '1' when ADDR_I(tag_reg'range) = tag_reg else '0';
cache_miss <= CYC_I and STB_I and not WE_I and not tag_match;
register_access <= CYC_I and STB_I and ADDR_I(FLASH_ADDR_BITS);
ACK_O <= ACK_mem or ACK_reg;
DAT_O <= DAT_reg when ACK_reg = '1' else DAT_mem;
tag_match <= tag_valid when ADDR_I(tag_reg'range) = tag_reg else '0';
register_access <= ADDR_I(FLASH_ADDR_BITS);
data_ram_addr_rd <= word_addr_reg when tag_we = '1' else ADDR_I(CACHE_ADDR_BITS-1 downto 2);
inst_spi_master : entity work.spi_master
@@ -97,33 +114,152 @@ inst_spi_master : entity work.spi_master
status => mst_status
);
inst_data_ram : entity work.dpram_1w1r2c_ra
GENERIC MAP
(
addr_width => CACHE_ADDR_BITS-2,
data_width => 32
)
PORT MAP
(
clk_a => CLK_I,
clk_b => CLK_I,
re_b => '1',
we_a => mst_dout_vld,
addr_a => fill_addr,
addr_b => data_ram_addr_rd,
din_a => mst_dout,
dout_b => DAT_mem
);
word_addr_register:
process(CLK_I)
begin
if rising_edge(CLK_I) then
if (CYC_I and STB_I and not register_access and not WE_I) = '1' then
word_addr_reg <= ADDR_I(CACHE_ADDR_BITS-1 downto 2);
end if;
end if;
end process;
read_cache_ack:
process(CLK_I)
begin
if rising_edge(CLK_I) then
ACK_mem <= (CYC_I and STB_I and not register_access and not WE_I and tag_match) or tag_we;
end if;
end process;
tag_register:
process(CLK_I)
begin
if rising_edge(CLK_I) then
if RST_I = '1' then
tag_valid <= '0';
elsif tag_we = '1' then
tag_valid <= '1';
tag_reg <= ADDR_I(tag_reg'range);
end if;
end if;
end process;
fill_addr_register:
process(CLK_I)
begin
if rising_edge(CLK_I) then
if mst_cmd_vld = '1' then
fill_addr <= (others => '0');
elsif mst_dout_vld = '1' then
fill_addr <= fill_addr + 1;
end if;
end if;
end process;
proc_state_next:
process(CLK_I)
begin
if rising_edge(CLK_I) then
if RST_I = '1' then
state <= reset;
else
state <= state_next;
end if;
end if;
end process;
proc_fsm:
process(state, CYC_I, STB_I, WE_I, tag_match, mst_cmd_rdy, mst_din_rdy, mst_status, register_access)
begin
state_next <= state;
SRDY_O <= CYC_I;
mst_cmd_vld <= '0';
mst_din_vld <= '0';
tag_we <= '0';
case state is
when reset =>
state_next <= idle;
when idle =>
if (CYC_I and STB_I and not WE_I and not register_access) = '1' then
if tag_match = '0' then
state_next <= spi_cmd;
end if;
end if;
when spi_cmd =>
mst_cmd_vld <= '1';
if mst_cmd_rdy = '1' then
state_next <= spi_data;
end if;
when spi_data =>
mst_din_vld <= '1';
if mst_din_rdy = '1' then
state_next <= cache_fill_start;
end if;
when cache_fill_start =>
if mst_status.xfer_busy = '1' then
state_next <= cache_fill;
end if;
when cache_fill =>
if mst_status.xfer_busy = '0' then
state_next <= finish;
end if;
when finish =>
tag_we <= '1';
state_next <= idle;
when others =>
state_next <= idle;
end case;
end process;
------------------------------------------------------------------
registers_write:
process(CLK_I)
begin
mst_cmd_vld <= '0';
mst_din_vld <= '0';
if rising_edge(CLK_I) then
mst_ctrl.clk_div <= to_unsigned(100, 8);
if RST_I = '1' then
mst_ctrl.clk_div <= to_unsigned(0, 8);
mst_ctrl.cpol <= '0';
mst_ctrl.cpha <= '0';
elsif (register_access and WE_I) = '1' then
mst_ctrl.msb_first <= '1';
elsif (CYC_I and STB_I and register_access and WE_I) = '1' then
case ADDR_I(5 downto 2) is
mst_cmd_vld <= DAT_I(0);
when "0000" =>
mst_cmd.xfer_size <= DAT_I;
when "0001" =>
mst_cmd.data_size <= DAT_I;
when "0010" =>
mst_din <= DAT_I;
mst_din_vld <= '1';
when "0011" =>
when "0100" =>
@@ -141,32 +277,30 @@ registers_read:
registers_read:
process(CLK_I)
begin
mst_dout_re <= '0';
ACK_O <= '0';
if (register_access) = '1' then
ACK_O <= not WE_I;
DAT_O <= (others => '0');
if rising_edge(CLK_I) then
ACK_reg <= '0';
if (CYC_I and STB_I and register_access) = '1' then
ACK_reg <= not WE_I;
DAT_reg <= (others => '0');
case ADDR_I(5 downto 2) is
DAT_O(2 downto 0) <= mst_dout_vld & mst_din_rdy & mst_cmd_rdy;
DAT_O(15 downto 8) <= spi_hold & mst_status.rx_valid & mst_status.read_fifo_empty & mst_status.read_fifo_full & mst_status.write_fifo_empty & mst_status.write_fifo_full & mst_status.cmd_fifo_empty & mst_status.cmd_fifo_full;
when "0000" =>
DAT_reg(2 downto 0) <= mst_dout_vld & mst_din_rdy & mst_cmd_rdy;
DAT_reg(15 downto 8) <= spi_hold & mst_status.xfer_busy & mst_status.read_fifo_empty & mst_status.read_fifo_full & mst_status.write_fifo_empty & mst_status.write_fifo_full & mst_status.cmd_fifo_empty & mst_status.cmd_fifo_full;
DAT_O <= mst_cmd.xfer_size;
when "0001" =>
DAT_reg <= mst_cmd.xfer_size;
DAT_O <= mst_cmd.data_size;
when "0010" =>
DAT_reg <= mst_cmd.data_size;
DAT_O <= mst_dout;
mst_dout_re <= not WE_I;
when "0011" =>
DAT_reg <= mst_dout;
DAT_O(7 downto 0) <= mst_ctrl.clk_div;
DAT_O(8) <= mst_ctrl.cpol;
DAT_O(9) <= mst_ctrl.cpha;
DAT_O(10) <= mst_ctrl.msb_first;
when "0100" =>
DAT_reg(7 downto 0) <= mst_ctrl.clk_div;
DAT_reg(8) <= mst_ctrl.cpol;
DAT_reg(9) <= mst_ctrl.cpha;
DAT_reg(10) <= mst_ctrl.msb_first;
when others => null;
lib/spi/src/tb_spi_flash_wb.vhd
+51
View File
@@ -88,6 +88,13 @@ uut : entity work.spi_flash_wb
);
inst_spi_slave: entity work.S25fl064k
GENERIC MAP
(
UserPreload => TRUE,
mem_file_name => "tb_spi_flash_wb.mem",
screg_file_name => "none"
)
PORT MAP (
SCK => mst_clk, -- serial clock input
SI => mosi, -- serial data input
@@ -122,6 +129,50 @@ STIMULUS: process
wait until rising_edge(CLK) and ACK_O = '1';
CYC_I <= '0';
wait for 10*CLK_PERIOD;
wait until rising_edge(CLK);
ADDR_I <= X"0000_0000";
STB_I <= '1';
CYC_I <= '1';
wait until rising_edge(CLK) and SRDY_O = '1';
STB_I <= '0';
wait until rising_edge(CLK) and ACK_O = '1';
CYC_I <= '0';
wait for 10*CLK_PERIOD;
wait until rising_edge(CLK);
ADDR_I <= X"0000_0004";
STB_I <= '1';
CYC_I <= '1';
wait until rising_edge(CLK) and SRDY_O = '1';
STB_I <= '0';
wait until rising_edge(CLK) and ACK_O = '1';
CYC_I <= '0';
wait for 10*CLK_PERIOD;
wait until rising_edge(CLK);
ADDR_I <= X"0000_0100";
STB_I <= '1';
CYC_I <= '1';
wait until rising_edge(CLK) and SRDY_O = '1';
STB_I <= '0';
wait until rising_edge(CLK) and ACK_O = '1';
CYC_I <= '0';
wait for 10*CLK_PERIOD;
CYC_I <= '1';
for i in 0 to 63 loop
ADDR_I <= to_unsigned(4*i, 32);
STB_I <= '1';
wait until rising_edge(CLK) and SRDY_O = '1';
STB_I <= '0';
wait until rising_edge(CLK) and ACK_O = '1';
end loop;
wait for 10*CLK_PERIOD;
CYC_I <= '1';
wait;
end process;