Revision 1418
Added by markw 12 months ago
| atari_chips/pokeyv2/flash_controller.vhd | ||
|---|---|---|
|
|
||
|
signal complete : std_logic;
|
||
|
signal update_robin : std_logic;
|
||
|
signal flash_read : std_logic;
|
||
|
signal flash_read_next : std_logic;
|
||
|
signal flash_read_reg : std_logic;
|
||
|
signal flash_readvalid : std_logic;
|
||
|
signal flash_write_next : std_logic;
|
||
|
signal flash_write_reg : std_logic;
|
||
| ... | ... | |
|
flash_do_reg <= (others=>'0');
|
||
|
flash_complete_reg <= (others=>'0');
|
||
|
flash_write_reg <= '0';
|
||
|
flash_read_reg <= '0';
|
||
|
elsif (clk'event and clk='1') then
|
||
|
state_reg <= state_next;
|
||
|
request_addr_reg <= request_addr_next;
|
||
| ... | ... | |
|
flash_do_reg <= flash_do_next;
|
||
|
flash_complete_reg <= flash_complete_next;
|
||
|
flash_write_reg <= flash_write_next;
|
||
|
flash_read_reg <= flash_read_next;
|
||
|
end if;
|
||
|
end process;
|
||
|
|
||
| ... | ... | |
|
|
||
|
flash_readvalid, flash_waitrequest,
|
||
|
|
||
|
flash_write_reg,
|
||
|
flash_write_reg, flash_read_reg,
|
||
|
|
||
|
complete,
|
||
|
update_robin
|
||
| ... | ... | |
|
robin_next <= robin_reg;
|
||
|
|
||
|
complete <= '0';
|
||
|
flash_read <= '0';
|
||
|
flash_read_next <= flash_read_reg;
|
||
|
flash_write_next <= flash_write_reg;
|
||
|
|
||
|
device := '0';
|
||
| ... | ... | |
|
update_robin <= '1';
|
||
|
end if;
|
||
|
when state_read=>
|
||
|
flash_read <= '1';
|
||
|
flash_read_next <= '1';
|
||
|
state_next <= state_read_wait;
|
||
|
when state_read_wait =>
|
||
|
flash_read <= flash_waitrequest;
|
||
|
if (flash_waitrequest = '0') then
|
||
|
flash_read_next <= '0';
|
||
|
end if;
|
||
|
if (flash_readvalid = '1') then
|
||
|
complete <= '1';
|
||
|
state_next <= state_delay;
|
||
| ... | ... | |
|
|
||
|
-- mux on selected device
|
||
|
process(device_reg, flash_data_do, flash_config_do,
|
||
|
flash_write_reg,flash_read,flash_data_readvalid,flash_data_waitrequest)
|
||
|
flash_write_reg,flash_read_reg,flash_data_readvalid,flash_data_waitrequest)
|
||
|
begin
|
||
|
flash_do <= (others=>'0');
|
||
|
|
||
| ... | ... | |
|
|
||
|
if (device_reg='1') then --config
|
||
|
flash_do <= flash_config_do;
|
||
|
flash_config_read <= flash_read;
|
||
|
flash_config_read <= flash_read_reg;
|
||
|
flash_config_write <= flash_write_reg;
|
||
|
flash_readvalid <= '1';
|
||
|
elsif (device_reg='0') then --main
|
||
|
flash_do <= flash_data_do;
|
||
|
flash_data_read <= flash_read;
|
||
|
flash_data_read <= flash_read_reg;
|
||
|
flash_data_write <= flash_write_reg;
|
||
|
flash_readvalid <= flash_data_readvalid;
|
||
|
flash_waitrequest <= flash_data_waitrequest;
|
||
Also available in: Unified diff
Had a combinatorial loop, register flash_read. This needs testing on all 04/08/16 combinations!