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moved logic into process

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This commit is contained in:
Markus Fröschle
2014-12-26 19:47:22 +00:00
parent df5164157d
commit 0c26287af7
1 changed files with 38 additions and 29 deletions
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67
vhdl/rtl/vhdl/DDR/DDR_CTRL.vhd
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@@ -183,41 +183,50 @@ ARCHITECTURE BEHAVIOUR of DDR_CTRL IS
SIGNAL va_p : unsigned(12 DOWNTO 0);
SIGNAL ba_s : unsigned(1 DOWNTO 0) ;
SIGNAL ba_p : unsigned(1 DOWNTO 0);
BEGIN
access_width <= long_access WHEN fb_size1 = '0' AND fb_size0 = '0' ELSE
word_access WHEN fb_size1 = '1' AND fb_size0 = '0' ELSE
byte_access WHEN fb_size1 = '0' AND fb_size0 = '1' ELSE
line_access;
-- Byte selectors:
byte_sel(0) <= '1' WHEN fb_adr(1 DOWNTO 0) = "00" OR
access_width = line_access OR
access_width = long_access
ELSE '0';
byte_sel(1) <= '1' WHEN fb_adr(1 DOWNTO 0) = "01" OR
(access_width = word_access AND fb_adr(1) = '0') OR
access_width = line_access OR
access_width = long_access
ELSE '0';
byte_sel(2) <= '1' WHEN fb_adr(1 DOWNTO 0) = "10" OR
access_width = line_access OR
access_width = long_access
ELSE '0';
byte_sel(3) <= '1' WHEN fb_adr(1 DOWNTO 0) = "11" OR
(access_width = word_access AND fb_adr(1) = '1') OR
access_width = line_access OR
access_width = long_access
ELSE '0';
BEGIN
---------------------------------------------------------------------------------------------------------------------------------------------------------------
------------------------------------ ddr_access_cpu READ (REG DDR => ddr_access_cpu) AND WRITE (ddr_access_cpu => REG DDR) ---------------------------------------------------------------------
fbctrl_reg : PROCESS
VARIABLE aw : access_width_t;
BEGIN
WAIT UNTIL rising_edge(clk_main);
-- determine access type
CASE std_logic_vector'(fb_size1 & fb_size0) IS
WHEN "00" => aw := long_access;
WHEN "01" => aw := byte_access;
WHEN "10" => aw := word_access;
WHEN OTHERS => aw := line_access;
END CASE;
-- determine byte selectors
IF fb_adr(1 DOWNTO 0) = "00" OR aw = line_access OR aw = long_access THEN
byte_sel(0) <= '1';
ELSE
byte_sel(0) <= '0';
END IF;
IF fb_adr(1 DOWNTO 0) = "01" OR (aw = word_access AND fb_adr(1) = '0') OR aw = line_access OR aw = long_access THEN
byte_sel(1) <= '1';
ELSE
byte_sel(1) <= '0';
END IF;
IF fb_adr(1 DOWNTO 0) = "10" OR aw = line_access OR aw = long_access THEN
byte_sel(2) <= '1';
ELSE
byte_sel(2) <= '0';
END IF;
IF fb_adr(1 DOWNTO 0) = "11" OR (aw = word_access AND fb_adr(1) = '1') OR aw = line_access OR aw = long_access THEN
byte_sel(3) <= '1';
ELSE
byte_sel(3) <= '0';
END IF;
fb_regddr <= fb_regddr_next;
access_width <= aw;
END PROCESS FBCTRL_REG;
fbctrl_dec : PROCESS(fb_regddr, bus_cyc, ddr_sel, access_width, fb_wr_n, ddr_cs)