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gs: parameter for automatic INT rate calculation.

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sorgelig
2020-08-17 01:32:17 +08:00
parent 9d3a77adf9
commit c348a981fc
1 changed files with 14 additions and 12 deletions
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26
rtl/gs.v
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@@ -66,7 +66,7 @@
*/
module gs #(parameter ROMFILE="gs105b.mif")
module gs #(parameter ROMFILE="gs105b.mif", CLK_RATE = 56000000)
(
input RESET,
input CLK,
@@ -119,22 +119,24 @@ T80pa cpu
.DI(cpu_di_bus)
);
// INT#
reg ce_37480;
always @(posedge CLK) begin
reg [9:0] cnt;
if(CE) begin
cnt <= cnt + 1'b1;
if (cnt == 746) begin // 37.48kHz
cnt <= 0;
int_n <= 0;
end
end
reg [31:0] sum = 0;
ce_37480 = 0;
sum = sum + 37480;
if(sum >= CLK_RATE) begin
sum = sum - CLK_RATE;
ce_37480 = 1;
end
end
// INT#
always @(posedge CLK) begin
if (ce_37480) int_n <= 0;
if (~cpu_iorq_n & ~cpu_m1_n) int_n <= 1;
end
reg bit7;
reg bit0;
always @(posedge CLK) begin