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small changes to SI module

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This commit is contained in:
Mateusz Faderewski 2024-01-25 23:37:04 +01:00
parent 3462479457
commit ad66e89e5d
1 changed files with 16 additions and 5 deletions
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21
fw/rtl/n64/n64_si.sv
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@ -59,6 +59,7 @@ module n64_si (
// Data falling/rising event generator
logic last_si_dq_in;
logic si_dq_in_inhibit;
always_ff @(posedge clk) begin
if (si_clk_rising_edge) begin
@ -70,8 +71,8 @@ module n64_si (
logic si_dq_rising_edge;
always_comb begin
si_dq_falling_edge = si_clk_rising_edge && last_si_dq_in && !si_dq_in;
si_dq_rising_edge = si_clk_rising_edge && !last_si_dq_in && si_dq_in;
si_dq_falling_edge = si_clk_rising_edge && last_si_dq_in && !si_dq_in && !si_dq_in_inhibit;
si_dq_rising_edge = si_clk_rising_edge && !last_si_dq_in && si_dq_in && !si_dq_in_inhibit;
end
@ -94,7 +95,7 @@ module n64_si (
always_comb begin
rx_timeout = si_clk_rising_edge && si_dq_in && (&rx_sub_bit_counter);
rx_bit_valid = si_dq_rising_edge;
rx_bit_data = (rx_sub_bit_counter > 5'd4) ? 1'b0 : 1'b1;
rx_bit_data = (rx_sub_bit_counter >= 5'd4) ? 1'b0 : 1'b1;
end
@ -124,7 +125,7 @@ module n64_si (
logic rx_stop;
always_comb begin
rx_stop = si_clk_rising_edge && si_dq_in && (rx_sub_bit_counter == 5'd16) && (rx_bit_counter == 3'd1);
rx_stop = si_clk_rising_edge && si_dq_in && (rx_sub_bit_counter == 5'd15) && (rx_bit_counter == 3'd1);
end
@ -260,7 +261,8 @@ module n64_si (
typedef enum bit [1:0] {
TX_STATE_IDLE,
TX_STATE_DATA,
TX_STATE_STOP
TX_STATE_STOP,
TX_STATE_STOP_WAIT
} e_tx_state;
e_tx_state tx_state;
@ -278,12 +280,14 @@ module n64_si (
if (reset) begin
tx_state <= TX_STATE_IDLE;
si_dq_in_inhibit <= 1'b0;
end else begin
case (tx_state)
TX_STATE_IDLE: begin
if (tx_start) begin
tx_byte_counter <= 4'd0;
tx_state <= TX_STATE_DATA;
si_dq_in_inhibit <= 1'b1;
end
end
@ -299,7 +303,14 @@ module n64_si (
TX_STATE_STOP: begin
tx_stop <= 1'b1;
if (!tx_busy && tx_stop) begin
tx_state <= TX_STATE_STOP_WAIT;
end
end
TX_STATE_STOP_WAIT: begin
if (!tx_busy) begin
tx_state <= TX_STATE_IDLE;
si_dq_in_inhibit <= 1'b0;
end
end
endcase