first cut at making a bidirectional 2 port ram for the gpmc data interface

ISE chokes on the unequal size ram

1 files changed, 44 insertions, 0 deletions

diff --git a/usrp2/control_lib/ram_2port_mixed_width.v b/usrp2/control_lib/ram_2port_mixed_width.v
new file mode 100644
index 000000000..3fa43114f
--- /dev/null
+++ b/usrp2/control_lib/ram_2port_mixed_width.v
@@ -0,0 +1,44 @@
+
+
+module ram_2port_mixed_width
+  #(parameter AWIDTH=9)
+    (input clk16,
+     input en16,
+     input we16,
+     input [10:0] addr16,
+     input [15:0] di16,
+     output reg [15:0] do16,
+     
+     input clk32,
+     input en32,
+     input we32,
+     input [9:0] addr32,
+     input [31:0] di32,
+     output reg [31:0] do32);
+   
+   reg [31:0] 	       ram [(1<<AWIDTH)-1:0];
+   integer 	       i;
+   initial
+     for(i=0;i<512;i=i+1)
+       ram[i] <= 32'b0;
+   
+   always @(posedge clk16)
+     if (en16)
+       begin
+          if (we16)
+            if(addr16[0])
+	      ram[addr16[10:1]][15:0] <= di16;
+	    else
+	      ram[addr16[10:1]][31:16] <= di16;
+	  do16 <= addr16[0] ? ram[addr16[10:1]][15:0] : ram[addr16[10:1]][31:16];
+       end
+
+   always @(posedge clk32)
+     if (en32)
+       begin
+          if (we32)
+            ram[addr32] <= di32;
+          do32 <= ram[addr32];
+       end
+
+endmodule // ram_2port_mixed_width