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https://opencores.org/ocsvn/ft245r_interface/ft245r_interface/trunk
[/] [ft245r_interface/] [trunk/] [ft245rl_interface.vhd] - Diff between revs 2 and 3
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| Rev 2 |
Rev 3 |
| Line 122... |
Line 122... |
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-- Well, here we simply write a byte to FT245RL's data bus
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-- Well, here we simply write a byte to FT245RL's data bus
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elsif(do_write = '1')then
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elsif(do_write = '1')then
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c_state <= WRITE_BYTE;
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c_state <= WRITE_BYTE;
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end if;
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end if;
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-- leds <= "1111";
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-- Read one byte from the device
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-- Read one byte from the device
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when READ_BYTE =>
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when READ_BYTE =>
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busy <= '1';
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busy <= '1';
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nrd <= '0';
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nrd <= '0';
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current_delay <= t3_delay;
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current_delay <= t3_delay;
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c_state <= DO_DELAY;
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c_state <= DO_DELAY;
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n_state <= READ_BYTE1;
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n_state <= READ_BYTE1;
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-- leds <= "1111";
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when READ_BYTE1 =>
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when READ_BYTE1 =>
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current_delay <= t1_delay - t3_delay;
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current_delay <= t1_delay - t3_delay;
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c_state <= DO_DELAY;
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c_state <= DO_DELAY;
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n_state <= READ_BYTE2;
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n_state <= READ_BYTE2;
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-- leds <= "1110";
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when READ_BYTE2 =>
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when READ_BYTE2 =>
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data_out <= in_buff;
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data_out <= in_buff;
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nrd <= '1';
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nrd <= '1';
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current_delay <= t5_delay;
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current_delay <= t5_delay;
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c_state <= DO_DELAY;
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c_state <= DO_DELAY;
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n_state <= READ_BYTE3;
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n_state <= READ_BYTE3;
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-- leds <= "1101";
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when READ_BYTE3 =>
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when READ_BYTE3 =>
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current_delay <= t2_delay;
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current_delay <= t2_delay;
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c_state <= DO_DELAY;
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c_state <= DO_DELAY;
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n_state <= IDLE;
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n_state <= IDLE;
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data_available <= '1';
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data_available <= '1';
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busy <= '0';
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busy <= '0';
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-- leds <= "1100";
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-- Write one byte to the device
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-- Write one byte to the device
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when WRITE_BYTE =>
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when WRITE_BYTE =>
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busy <= '1';
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busy <= '1';
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if(ntxe = '0')then
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if(ntxe = '0')then
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| Line 169... |
Line 164... |
n_state <= WRITE_BYTE1;
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n_state <= WRITE_BYTE1;
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out_buff <= data_in;
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out_buff <= data_in;
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else
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else
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c_state <= WRITE_BYTE;
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c_state <= WRITE_BYTE;
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end if;
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end if;
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-- leds <= "1011";
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when WRITE_BYTE1 =>
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when WRITE_BYTE1 =>
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nwr <= '0';
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nwr <= '0';
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current_delay <= t11_delay;
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current_delay <= t11_delay;
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c_state <= DO_DELAY;
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c_state <= DO_DELAY;
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n_state <= WRITE_BYTE2;
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n_state <= WRITE_BYTE2;
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-- leds <= "1010";
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when WRITE_BYTE2 =>
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when WRITE_BYTE2 =>
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we <= '0';
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we <= '0';
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current_delay <= t12_delay;
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current_delay <= t12_delay;
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c_state <=DO_DELAY;
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c_state <=DO_DELAY;
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n_state <= WRITE_BYTE3;
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n_state <= WRITE_BYTE3;
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-- leds <= "1001";
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when WRITE_BYTE3 =>
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when WRITE_BYTE3 =>
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busy <= '0';
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busy <= '0';
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c_state <= IDLE;
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c_state <= IDLE;
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-- leds <= "1000";
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when DO_DELAY =>
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when DO_DELAY =>
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if(delay_cnt < current_delay)then
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if(delay_cnt < current_delay)then
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delay_cnt <= delay_cnt + 1;
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delay_cnt <= delay_cnt + 1;
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else
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else
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c_state <= n_state;
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c_state <= n_state;
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delay_cnt <= 0;
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delay_cnt <= 0;
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end if;
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end if;
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-- leds <= "0111";
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when others =>
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when others =>
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c_state <= INIT;
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c_state <= INIT;
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end case; -- c_state
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end case; -- c_state
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end if;
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end if;
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