1 files changed, 64 insertions, 0 deletions
diff --git a/fpga/usrp2/control_lib/system_control.v b/fpga/usrp2/control_lib/system_control.v
new file mode 100644
index 000000000..7e7b71f3c
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+++ b/fpga/usrp2/control_lib/system_control.v
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+//
+// Copyright 2011 Ettus Research LLC
+//
+// This program is free software: you can redistribute it and/or modify
+// it under the terms of the GNU General Public License as published by
+// the Free Software Foundation, either version 3 of the License, or
+// (at your option) any later version.
+//
+// This program is distributed in the hope that it will be useful,
+// but WITHOUT ANY WARRANTY; without even the implied warranty of
+// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+// GNU General Public License for more details.
+//
+// You should have received a copy of the GNU General Public License
+// along with this program.  If not, see <http://www.gnu.org/licenses/>.
+//
+
+// System bootup order:
+//    0 - Internal POR to reset this block.  Maybe control it from CPLD in the future?
+//    1 - Everything in reset
+//    2 - Take RAM Loader out of reset
+//    3 - When RAM Loader done, take processor and wishbone out of reset
+
+module system_control 
+  (input wb_clk_i,
+   output reg ram_loader_rst_o,
+   output reg wb_rst_o,
+   input ram_loader_done_i
+   );
+
+   reg 		POR = 1'b1;
+   reg [3:0] 	POR_ctr;
+
+   initial POR_ctr = 4'd0;
+   always @(posedge wb_clk_i)
+     if(POR_ctr == 4'd15)
+       POR <= 1'b0;
+     else
+       POR_ctr <= POR_ctr + 4'd1;
+   
+   always @(posedge POR or posedge wb_clk_i)
+     if(POR)
+       ram_loader_rst_o <= 1'b1;
+     else
+       ram_loader_rst_o <= #1 1'b0;
+
+   // Main system reset
+   reg 		delayed_rst;
+   
+   always @(posedge POR or posedge wb_clk_i)
+     if(POR)
+       begin
+	  wb_rst_o <= 1'b1;
+	  delayed_rst <= 1'b1;
+       end
+     else if(ram_loader_done_i)
+       begin
+	  delayed_rst <= 1'b0;
+	  wb_rst_o <= delayed_rst;
+       end
+
+endmodule // system_control
+
+