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extend flexbus_register

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This commit is contained in:
Markus Fröschle
2016-07-29 05:25:13 +00:00
parent 02e1530cce
commit 268147a9be
2 changed files with 52 additions and 23 deletions
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2
FPGA_Quartus_13.1/firebee1.qsf
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@@ -677,7 +677,6 @@ set_global_assignment -name AUTO_DELAY_CHAINS_FOR_HIGH_FANOUT_INPUT_PINS OFF
set_global_assignment -name OPTIMIZE_FOR_METASTABILITY OFF
set_instance_assignment -name GLOBAL_SIGNAL "GLOBAL CLOCK" -to i_video|i_video_mod_mux_clutctr|CLK13M_q
set_instance_assignment -name GLOBAL_SIGNAL "GLOBAL CLOCK" -to i_video|i_video_mod_mux_clutctr|CLK17M_q
set_instance_assignment -name PARTITION_HIERARCHY root_partition -to | -section_id Top
set_global_assignment -name VHDL_FILE firebee_utils_pkg.vhd
set_global_assignment -name AHDL_FILE altpll_reconfig1_pllrcfg_t4q.tdf
set_global_assignment -name AHDL_FILE altpll_reconfig1.tdf
@@ -865,3 +864,4 @@ set_global_assignment -name QIP_FILE lpm_shiftreg0.qip
set_global_assignment -name QIP_FILE lpm_counter1.qip
set_global_assignment -name QIP_FILE altiobuf_bidir0.qip
set_global_assignment -name VHDL_FILE flexbus_register.vhd
set_instance_assignment -name PARTITION_HIERARCHY root_partition -to | -section_id Top

71
FPGA_Quartus_13.1/flexbus_register.vhd
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@@ -2,50 +2,79 @@ library ieee;
use ieee.std_logic_1164.all;
use ieee.numeric_std.all;
library work;
use work.firebee_utils_pkg.all;
entity flexbus_register is
generic
(
reg_width : integer := 11;
match_address : std_logic_vector(31 downto 0) := (others => '0');
match_mask : std_logic_vector(31 downto 0) := (others => '1');
num_ignore : integer range 0 to 31;
match_fbcs : integer := 0
);
port
(
clk : in std_logic;
-- FlexBus signals
fb_addr : in std_logic_vector(31 downto 0);
fb_data : inout std_logic_vector(31 downto 0);
fb_cs : in std_logic_vector(5 downto 1);
fb_ad_in : in std_logic_vector(31 downto 0);
fb_ad_out : out std_logic_vector(31 downto 0);
fb_cs_n : in std_logic_vector(5 downto 1);
fb_wr_n : in std_logic;
fb_ta_n : out std_logic;
reg_value : inout std_logic_vector(reg_width - 1 downto 0);
cs : out std_logic := '0'
fb_oe_n : in std_logic;
fb_size : in std_logic_vector(1 downto 0);
register_ta : out std_logic
);
end entity flexbus_register;
architecture rtl of flexbus_register is
signal fbcs_match : std_logic;
signal address_match : std_logic;
signal fb_b : std_logic_vector(3 downto 0); -- byte selects
signal cs : std_logic;
signal reg_value : std_logic_vector(reg_width - 1 downto 0);
begin
fbcs_match <= '1' when fb_cs(match_fbcs) = '1' else '0';
address_match <= '1' when (fb_addr and match_mask) = (match_address and match_mask) else '0';
-- byte selects
-- HWORD
-- HHBYT
-- LONG UND LINE
fb_b(0) <= (fb_size(1) and (not fb_size(0)) and (not fb_addr(1))) or
((not fb_size(1)) and fb_size(0) and (not fb_addr(1)) and (not fb_addr(0))) or
((not fb_size(1)) and (not fb_size(0))) or
(fb_size(1) and fb_size(0));
-- HWORD
-- HLBYT
-- LONG UND LINE
fb_b(1) <= (fb_size(1) and (not fb_size(0) and (not fb_addr(1)))) or
((not fb_size(1)) and fb_size(0) and (not fb_addr(1)) and fb_addr(0)) or
((not fb_size(1)) and (not fb_size(0))) or
(fb_size(1) and fb_size(0));
-- LWORD
-- LHBYT
-- LONG UND LINE
fb_b(2) <= (fb_size(1) and (not fb_size(0)) and fb_addr(1)) or
((not fb_size(1)) and fb_size(0) and fb_addr(1) and (not fb_addr(0))) or
((not fb_size(1)) and (not fb_size(0))) or (fb_size(1) and fb_size(0));
-- LWORD
-- LLBYT
-- LONG UND LINE
fb_b(3) <= (fb_size(1) and (not fb_size(0)) and fb_addr(1)) or
((not fb_size(1)) and fb_size(0) and fb_addr(1) and fb_addr(0)) or
((not fb_size(1)) and (not fb_size(0))) or
(fb_size(1) and fb_size(0));
fbcs_match <= '1' when not(fb_cs_n(match_fbcs)) = '1' else '0';
address_match <= f_addr_cmp_mask(fb_addr, match_address, num_ignore);
p_register_access : process(all)
begin
if rising_edge(clk) then
if fbcs_match = '1' and address_match = '1' then
cs <= '1';
if fb_wr_n = '0' then -- write access
reg_value <= fb_data(reg_width - 1 downto 0);
else -- read access
fb_data(reg_width - 1 downto 0) <= reg_value;
fb_ta_n <= '0';
end if;
else
fb_data <= (others => 'Z');
fb_ta_n <= 'Z';
cs <= '0';
end if;
end if;
end process p_register_access;
end architecture rtl;