1 files changed, 53 insertions, 0 deletions
diff --git a/fpga/usrp2/control_lib/wb_ram_block.v b/fpga/usrp2/control_lib/wb_ram_block.v
new file mode 100644
index 000000000..da6c610d3
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+++ b/fpga/usrp2/control_lib/wb_ram_block.v
@@ -0,0 +1,53 @@
+//
+// 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/>.
+//
+
+
+
+// Since this is a block ram, there are no byte-selects and there is a 1-cycle read latency
+//   These have to be a multiple of 512 lines (2K) long
+
+module wb_ram_block
+  #(parameter AWIDTH=9)
+    (input clk_i,
+     input stb_i,
+     input we_i,
+     input [AWIDTH-1:0] adr_i,
+     input [31:0] dat_i,
+     output reg [31:0] dat_o,
+     output ack_o);
+
+   reg [31:0] distram [0:1<<(AWIDTH-1)];
+
+   always @(posedge clk_i)
+     begin
+	if(stb_i & we_i)
+	  distram[adr_i] <= dat_i;
+	dat_o <= distram[adr_i];
+     end
+
+   reg stb_d1, ack_d1;
+   always @(posedge clk_i)
+     stb_d1 <= stb_i;
+   
+   always @(posedge clk_i)
+     ack_d1 <= ack_o;
+   
+   assign ack_o = stb_i & (we_i | (stb_d1 & ~ack_d1));
+endmodule // wb_ram_block
+
+
+