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Defender: use clk_mem for ROM download

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This commit is contained in:
Gyorgy Szombathelyi
2021-05-22 19:43:48 +02:00
parent 458b05452a
commit cb166e6d88
1 changed files with 9 additions and 5 deletions
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14
Arcade_MiST/Williams 6809 rev.1 Hardware/Defender Hardware/rtl/Defender_MiST.sv
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@@ -205,7 +205,7 @@ ROM Structure:
7400-7BFF snd cpu 2k
*/
data_io data_io (
.clk_sys ( clk_sys ),
.clk_sys ( clk_mem ),
.SPI_SCK ( SPI_SCK ),
.SPI_SS2 ( SPI_SS2 ),
.SPI_DI ( SPI_DI ),
@@ -228,7 +228,7 @@ wire [11:0] snd_rom_addr;
wire snd_vma;
wire [15:0] snd_do;
sdram #(.MHZ(54)) sdram(
sdram #(.MHZ(72)) sdram(
.*,
.init_n ( pll_locked ),
.clk ( clk_mem ),
@@ -258,9 +258,8 @@ sdram #(.MHZ(54)) sdram(
.snd_q ( snd_do )
);
always @(posedge clk_sys) begin
always @(posedge clk_mem) begin
reg ioctl_wr_last = 0;
reg snd_vma_r, snd_vma_r2;
ioctl_wr_last <= ioctl_wr;
if (ioctl_downl && ioctl_index == 0) begin
@@ -269,6 +268,11 @@ always @(posedge clk_sys) begin
port2_req <= ~port2_req;
end
end
end
always @(posedge clk_sys) begin
reg snd_vma_r, snd_vma_r2;
snd_vma_r <= snd_vma; snd_vma_r2 <= snd_vma_r;
if (snd_vma_r2) snd_addr <= snd_rom_addr;
end
@@ -314,7 +318,7 @@ defender defender (
.snd_do ( snd_addr[0] ? snd_do[15:8] : snd_do[7:0] ),
.snd_vma ( snd_vma ),
.dl_clock ( clk_sys ),
.dl_clock ( clk_mem ),
.dl_addr ( ioctl_addr[15:0] ),
.dl_data ( ioctl_dout ),
.dl_wr ( ioctl_wr && ioctl_index == 0 ),