109 lines
2.8 KiB
Plaintext
109 lines
2.8 KiB
Plaintext
package Top;
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import Counter::*;
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import StmtFSM::*;
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typedef struct {
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Integer active;
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Integer fporch;
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Integer sync;
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Integer bporch;
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} SyncDescriptor;
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SyncDescriptor horizontal = SyncDescriptor{
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active: 640,
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fporch: 16,
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sync: 96,
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bporch: 48
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};
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SyncDescriptor vertical = SyncDescriptor{
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active: 480,
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fporch: 10,
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sync: 2,
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bporch: 33
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};
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interface SyncGenerator;
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method Action tick();
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method Bool preedge();
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method Bool out_n();
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method Bool out();
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method Bool active();
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endinterface
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interface ITop;
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(* always_ready *)
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method Bool paint();
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(* always_ready *)
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method Bool hsync();
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(* always_ready *)
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method Bool vsync();
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endinterface
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(* synthesize *)
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module mkTop (ITop);
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Reg#(Bool) rPaint <- mkReg(False);
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Reg#(Bool) rHsync <- mkReg(False);
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Reg#(Bool) rVsync <- mkReg(False);
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let blank_line_fsm = seq
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// Sync pulse
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repeat (96) rHsync <= True;
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// Back porch
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repeat (48) rHsync <= False;
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// Visible area
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repeat (640) noAction;
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// Front porch
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repeat (16) noAction;
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endseq;
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let video_line_fsm = seq
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// Sync pulse
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repeat (96) rHsync <= True;
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// Back porch
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repeat (48) rHsync <= False;
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// Visible area
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repeat (640) rPaint <= True;
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// Front porch
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repeat (16) rPaint <= False;
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endseq;
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let frame_fsm = seq
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while (True) seq
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// Sync pulse
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repeat (2) par
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rVsync <= True;
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blank_line_fsm;
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endpar
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// Back porch
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repeat (33) par
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rVsync <= False;
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blank_line_fsm;
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endpar
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// Visible area
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repeat (480) video_line_fsm;
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// Front porch
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repeat (10) blank_line_fsm;
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endseq
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endseq;
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let fsm <- mkFSM(frame_fsm);
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rule run_timing (fsm.done());
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fsm.start();
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endrule
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method Bool paint = rPaint._read;
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method Bool hsync = rHsync._read;
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method Bool vsync = rVsync._read;
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endmodule
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endpackage
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