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[Commit-gnuradio] r5192 - gnuradio/branches/developers/matt/u2f/control_
From: |
matt |
Subject: |
[Commit-gnuradio] r5192 - gnuradio/branches/developers/matt/u2f/control_lib |
Date: |
Mon, 30 Apr 2007 01:19:19 -0600 (MDT) |
Author: matt
Date: 2007-04-30 01:19:19 -0600 (Mon, 30 Apr 2007)
New Revision: 5192
Added:
gnuradio/branches/developers/matt/u2f/control_lib/wb_semaphore.v
Log:
semaphore memory, first cut
Added: gnuradio/branches/developers/matt/u2f/control_lib/wb_semaphore.v
===================================================================
--- gnuradio/branches/developers/matt/u2f/control_lib/wb_semaphore.v
(rev 0)
+++ gnuradio/branches/developers/matt/u2f/control_lib/wb_semaphore.v
2007-04-30 07:19:19 UTC (rev 5192)
@@ -0,0 +1,42 @@
+
+// up to 8 semaphores
+
+// After a read operation, the semaphore is always locked
+// If it was already locked before the read (meaning someone else holds the
lock)
+// then a 1 is returned
+// If it was not already locked (meaning the reader now holds the lock)
+// then a 0 is returned
+
+// A write operation clears the lock
+
+module wb_semaphore
+ #(parameter count=8, DBUS_WIDTH=32)
+ (input wb_clk_i,
+ input wb_rst_i,
+ input [DBUS_WIDTH-1:0] wb_dat_i,
+ input [2:0] wb_adr_i,
+ input wb_cyc_i,
+ input wb_stb_i,
+ input wb_we_i,
+ output wb_ack_o,
+ output [DBUS_WIDTH-1:0] wb_dat_o);
+
+ reg [count-1:0] locked;
+
+ always @(posedge clock)
+ if(wb_rst_i)
+ locked <= {count{1'b0}};
+ else if(wb_stb_i)
+ if(wb_we_i)
+ locked[adr_i] <= 1'b0;
+ else
+ locked[adr_i] <= 1'b1;
+
+ assign wb_dat_o[DBUS_WIDTH-1:1] = {(DBUS_WIDTH-1){1'b0}};
+ assign wb_dat_o[0] = locked[adr_i];
+ assign wb_ack_o = wb_stb_i;
+
+
+endmodule // wb_semaphore
+
+
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