ym3438: fix ch index output, add sync signal (fm_sel23)

nukeykt · Aug 14, 2023 · cac7f92 · cac7f92
1 parent b739c94
commit cac7f92
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Showing 2 changed files with 4 additions and 1 deletion.
diff --git a/md_board.v b/md_board.v
@@ -56,6 +56,7 @@ module md_board
 	output [9:0] MOL_2612, MOR_2612, // ym2612 dac emulation, signed
 	output [15:0] PSG,
 	output [2:0] DAC_ch_index,
+	output fm_sel23,
 
 	// input
 	input [6:0] PA_i,
@@ -425,6 +426,8 @@ module md_board
 		.DAC_ch_index(DAC_ch_index)
 		);
 
+	assign fm_sel23 = TEST0_o;
+
 	wire [2:0] IPL;
 	reg BR;
 	wire BERR;

diff --git a/ym3438_regs.v b/ym3438_regs.v
@@ -510,7 +510,7 @@ module ym3438_reg_ctrl
 
 	// EXTRA start
 
-	wire [2:0] dac_index_i = fsm_dac_out_sel ? reg_cnt[2:0] : (reg_cnt[2:0] + 3'h1);
+	wire [2:0] dac_index_i = reg_cnt[1:0] + (reg_cnt[2] ? 3'h3 : 3'h0) + { 2'h0, ~fsm_dac_out_sel };
 
 	ym_slatch #(.DATA_WIDTH(3)) dac_index_lock
 		(