dj-apendix/zx-multisound
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gs refactor

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This commit is contained in:
Eugene Lozovoy 2023-08-19 23:06:15 +03:00
parent a696ecdf28
commit 63a2324711
2 changed files with 16 additions and 14 deletions
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30
cpld/rtl/top.v
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@ -59,8 +59,9 @@ assign n_rstout = rst_n;
// n_iorq are useless in zxevo :(
// so we're detecting n_iorq cycle by n_rd/n_wr signal asserted without n_m1/n_mreq
reg ioreq;
reg ioreq, ioreq_prev;
always @(negedge clk32) begin
ioreq_prev <= ioreq;
// ioreq <= n_iorq == 1'b0 && n_m1 == 1'b1 && n_dos == 1'b1 && n_iodos == 1'b1;
ioreq <= n_m1 == 1'b1 && n_mreq == 1'b1 && (n_rd == 1'b0 || n_wr == 1'b0);
end
@ -77,11 +78,6 @@ always @(negedge clk32 or negedge rst_n) begin
rom_m1_access <= a[15:14] == 2'b00;
end
reg n_rd_wr_delayed, n_rd_wr_delayed1;
always @(posedge clk32) begin
n_rd_wr_delayed <= n_rd_wr_delayed1;
n_rd_wr_delayed1 <= n_wr & n_rd;
end
/* CONFIGURATION */
@ -156,6 +152,12 @@ assign midi_clk = clk12;
assign gclk = clk16;
assign n_grst = n_rstout;
reg gioreq, gioreq_prev;
always @(posedge clk32) begin
gioreq_prev <= gioreq;
gioreq <= n_giorq == 1'b0 && n_gm1 == 1'b1;
end
reg [8:0] g_int_cnt;
wire g_int_reload = g_int_cnt[8:6] == 4'b101;
always @(posedge clk12 or negedge rst_n) begin
@ -232,26 +234,26 @@ wire [7:0] gs_status = {gs_flag_data, 6'b111111, gs_flag_cmd};
always @(posedge clk32 or negedge rst_n) begin
if (!rst_n)
gs_flag_data <= 1'b0;
else if (~n_iorq && ~n_rd && n_rd_wr_delayed && port_b3)
else if (ioreq_rd && !ioreq_prev && port_b3)
gs_flag_data <= 1'b0;
else if (~n_iorq && ~n_wr && n_rd_wr_delayed && port_b3)
else if (ioreq_wr && !ioreq_prev && port_b3)
gs_flag_data <= 1'b1;
else if (~n_giorq && n_gm1 && ga[3:0] == 4'h2)
else if (gioreq && !gioreq_prev && ga[3:0] == 4'h2)
gs_flag_data <= 1'b0;
else if (~n_giorq && n_gm1 && ga[3:0] == 4'h3)
else if (gioreq && !gioreq_prev && ga[3:0] == 4'h3)
gs_flag_data <= 1'b1;
else if (~n_giorq && n_gm1 && ga[3:0] == 4'hA)
else if (gioreq && !gioreq_prev && ga[3:0] == 4'hA)
gs_flag_data <= ~gs_reg00[0];
end
always @(posedge clk32 or negedge rst_n) begin
if (!rst_n)
gs_flag_cmd <= 1'b0;
else if (~n_iorq && ~n_wr && n_rd_wr_delayed && port_bb)
else if (ioreq_wr && !ioreq_prev && port_bb)
gs_flag_cmd <= 1'b1;
else if (~n_giorq && n_gm1 && ga[3:0] == 4'h5)
else if (gioreq && !gioreq_prev && ga[3:0] == 4'h5)
gs_flag_cmd <= 1'b0;
else if (~n_giorq && n_gm1 && ga[3:0] == 4'hB)
else if (gioreq && !gioreq_prev && ga[3:0] == 4'hB)
gs_flag_cmd <= vol3[5];
end

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out/cpld.rev.A1.pof vendored
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