Fix a few scattered bugs, and get fetch to work.

[firearm.git] / BusArbiter.v

diff --git a/BusArbiter.v b/BusArbiter.v
new file mode 100644 (file)
index 0000000..2ddea59
--- /dev/null
+++ b/BusArbiter.v
@@ -0,0 +1,17 @@
+module BusArbiter(
+       input [7:0] bus_req,
+       output reg [7:0] bus_ack);
+
+       always @(*)
+               casez (bus_req)
+               8'b00000000: bus_ack = 8'b00000000;
+               8'b???????1: bus_ack = 8'b00000001;
+               8'b??????10: bus_ack = 8'b00000010;
+               8'b?????100: bus_ack = 8'b00000100;
+               8'b????1000: bus_ack = 8'b00001000;
+               8'b???10000: bus_ack = 8'b00010000;
+               8'b??100000: bus_ack = 8'b00100000;
+               8'b?1000000: bus_ack = 8'b01000000;
+               8'b10000000: bus_ack = 8'b10000000;
+               endcase
+endmodule