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delayed address latching cycle - might break other builds, needs testing

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Polprzewodnikowy 2022-09-16 21:50:49 +02:00
parent 093aabe940
commit ad802282b7
1 changed files with 10 additions and 8 deletions
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18
fw/rtl/n64/n64_pi.sv
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@ -20,16 +20,16 @@ module n64_pi (
logic [1:0] n64_reset_ff;
logic [1:0] n64_nmi_ff;
logic [2:0] n64_pi_alel_ff;
logic [2:0] n64_pi_aleh_ff;
logic [3:0] n64_pi_alel_ff;
logic [3:0] n64_pi_aleh_ff;
logic [1:0] n64_pi_read_ff;
logic [2:0] n64_pi_write_ff;
always_ff @(posedge clk) begin
n64_reset_ff <= {n64_reset_ff[0], n64_reset};
n64_nmi_ff <= {n64_nmi_ff[0], n64_nmi};
n64_pi_aleh_ff <= {n64_pi_aleh_ff[1:0], n64_pi_aleh};
n64_pi_alel_ff <= {n64_pi_alel_ff[1:0], n64_pi_alel};
n64_pi_aleh_ff <= {n64_pi_aleh_ff[2:0], n64_pi_aleh};
n64_pi_alel_ff <= {n64_pi_alel_ff[2:0], n64_pi_alel};
n64_pi_read_ff <= {n64_pi_read_ff[0], n64_pi_read};
n64_pi_write_ff <= {n64_pi_write_ff[1:0], n64_pi_write};
end
@ -44,8 +44,8 @@ module n64_pi (
always_comb begin
pi_reset = n64_reset_ff[1];
pi_nmi = n64_nmi_ff[1];
pi_aleh = n64_pi_aleh_ff[2];
pi_alel = n64_pi_alel_ff[2];
pi_aleh = n64_pi_aleh_ff[3];
pi_alel = n64_pi_alel_ff[3];
pi_read = n64_pi_read_ff[1];
pi_write = n64_pi_write_ff[2];
end
@ -250,6 +250,7 @@ module n64_pi (
logic [15:0] read_fifo_rdata;
logic read_fifo_wait;
logic [15:0] read_fifo_buffer;
n64_pi_fifo read_fifo_inst (
.clk(clk),
@ -268,6 +269,7 @@ module n64_pi (
always_ff @(posedge clk) begin
read_fifo_read <= 1'b0;
read_fifo_buffer <= read_fifo_rdata;
if (reset || !pi_reset || alel_op) begin
read_fifo_wait <= 1'b0;
@ -279,14 +281,14 @@ module n64_pi (
read_fifo_wait <= 1'b1;
end else begin
read_fifo_read <= 1'b1;
n64_pi_dq_out <= read_fifo_rdata;
n64_pi_dq_out <= read_fifo_buffer;
end
end
if (!read_fifo_empty && read_fifo_wait) begin
read_fifo_read <= 1'b1;
read_fifo_wait <= 1'b0;
n64_pi_dq_out <= read_fifo_rdata;
n64_pi_dq_out <= read_fifo_buffer;
end
end