Merged r9433:9527 from features/gr-usrp2 into trunk. Adds usrp2 and gr-usrp2 top-level components. Trunk passes distcheck with mb-gcc installed, but currently not without them. The key issue is that when mb-gcc is not installed, the build system skips over the usrp2/firmware directory, and the firmware include files don't get put into the dist tarball. But we can't do the usual DIST_SUBDIRS method as the firmware is a subpackage.

git-svn-id: http://gnuradio.org/svn/gnuradio/trunk@9528 221aa14e-8319-0410-a670-987f0aec2ac5

1 files changed, 24 insertions, 0 deletions

diff --git a/usrp2/fpga/eth/header_ram.v b/usrp2/fpga/eth/header_ram.v
new file mode 100644
index 000000000..699f16a4f
--- /dev/null
+++ b/usrp2/fpga/eth/header_ram.v
@@ -0,0 +1,24 @@
+
+module header_ram
+  #(parameter REGNUM=0,
+    parameter WIDTH=32)
+    (input clk,
+     input set_stb,
+     input [7:0] set_addr,
+     input [31:0] set_data,
+     
+     input [3:0] addr,
+     output [31:0] q 
+     );
+   
+   reg [WIDTH-1:0] mini_ram[0:15];
+   wire 	   write_to_ram = (set_stb & (set_addr[7:4]==REGNUM[7:4]));
+   wire [3:0] 	   ram_addr = write_to_ram ? set_addr[3:0] : addr;
+		   
+   always @(posedge clk)
+     if(write_to_ram)
+       mini_ram[ram_addr] <= set_data;
+
+   assign 	   q = mini_ram[ram_addr];
+
+endmodule // header_ram