Page 184 - 3-2

always @(posedge clk)
if(bot_idle)
bot_cnt<=0;
else
begin
bot_cnt<=bot_cnt+16'd1;
if(bot_cnt_max) bot_state<=~bot_state;
end

reg oneu_state;
reg oneu_up;
reg oneu_sync_0;
always @(posedge clk) oneu_sync_0<=~oneu;
reg oneu_sync_1;
always @(posedge clk) oneu_sync_1<=oneu_sync_0;

reg [15:0] oneu_cnt;

wire oneu_idle = (oneu_state==oneu_sync_1);
wire oneu_cnt_max = &oneu_cnt;

always @(posedge clk)
if(oneu_idle)
oneu_cnt<=0;
else
begin
oneu_cnt<=oneu_cnt+16'd1;
if(oneu_cnt_max) oneu_state<=~oneu_state;
end

reg twou_state;
reg twou_up;

reg twou_sync_0;
always @(posedge clk) twou_sync_0<=~twou;
reg twou_sync_1;
always @(posedge clk) twou_sync_1<=twou_sync_0;

reg [15:0] twou_cnt;

wire twou_idle = (twou_state==twou_sync_1);
wire twou_cnt_max = &twou_cnt;

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