diff options
Diffstat (limited to 'tests/arch/common/fsm.v')
| -rw-r--r-- | tests/arch/common/fsm.v | 51 |
1 files changed, 51 insertions, 0 deletions
diff --git a/tests/arch/common/fsm.v b/tests/arch/common/fsm.v new file mode 100644 index 000000000..9d3fbb64a --- /dev/null +++ b/tests/arch/common/fsm.v @@ -0,0 +1,51 @@ + module fsm ( clock, reset, req_0, req_1, gnt_0, gnt_1 );
+ input clock,reset,req_0,req_1;
+ output gnt_0,gnt_1;
+ wire clock,reset,req_0,req_1;
+ reg gnt_0,gnt_1;
+
+ parameter SIZE = 3;
+ parameter IDLE = 3'b001;
+ parameter GNT0 = 3'b010;
+ parameter GNT1 = 3'b100;
+ parameter GNT2 = 3'b101;
+
+ reg [SIZE-1:0] state;
+ reg [SIZE-1:0] next_state;
+
+ always @ (posedge clock)
+ begin : FSM
+ if (reset == 1'b1) begin
+ state <= #1 IDLE;
+ gnt_0 <= 0;
+ gnt_1 <= 0;
+ end
+ else
+ case(state)
+ IDLE : if (req_0 == 1'b1) begin
+ state <= #1 GNT0;
+ gnt_0 <= 1;
+ end else if (req_1 == 1'b1) begin
+ gnt_1 <= 1;
+ state <= #1 GNT0;
+ end else begin
+ state <= #1 IDLE;
+ end
+ GNT0 : if (req_0 == 1'b1) begin
+ state <= #1 GNT0;
+ end else begin
+ gnt_0 <= 0;
+ state <= #1 IDLE;
+ end
+ GNT1 : if (req_1 == 1'b1) begin
+ state <= #1 GNT2;
+ gnt_1 <= req_0;
+ end
+ GNT2 : if (req_0 == 1'b1) begin
+ state <= #1 GNT1;
+ gnt_1 <= req_1;
+ end
+ default : state <= #1 IDLE;
+ endcase
+ end
+endmodule
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