From a170b9b42345794429486dd4f3316e84ea2cc871 Mon Sep 17 00:00:00 2001
From: Josh Blum <josh@joshknows.com>
Date: Fri, 22 Jan 2010 11:46:58 -0800
Subject: Moved usrp1 fpga files into usrp1 subdir.

---
 usrp1/inband_lib/channel_demux.v | 78 ++++++++++++++++++++++++++++++++++++++++
 1 file changed, 78 insertions(+)
 create mode 100644 usrp1/inband_lib/channel_demux.v

(limited to 'usrp1/inband_lib/channel_demux.v')

diff --git a/usrp1/inband_lib/channel_demux.v b/usrp1/inband_lib/channel_demux.v
new file mode 100644
index 000000000..cca5cdb65
--- /dev/null
+++ b/usrp1/inband_lib/channel_demux.v
@@ -0,0 +1,78 @@
+module channel_demux
+ #(parameter NUM_CHAN = 2) (     //usb Side
+   input [31:0]usbdata_final,
+   input WR_final, 
+   // TX Side
+   input reset,
+   input txclk,
+   output reg [NUM_CHAN:0] WR_channel,
+   output reg [31:0] ram_data,
+   output reg [NUM_CHAN:0] WR_done_channel );
+   /* Parse header and forward to ram */
+	
+    reg [2:0]reader_state;
+    reg [4:0]channel ;
+    reg [6:0]read_length ;
+	
+	 // States
+    parameter IDLE      =    3'd0;
+    parameter HEADER    =    3'd1;
+    parameter WAIT      =    3'd2;
+    parameter FORWARD   =    3'd3;
+	
+	`define CHANNEL 20:16
+	`define PKT_SIZE 127
+	wire [4:0] true_channel;
+	assign true_channel = (usbdata_final[`CHANNEL] == 5'h1f) ?
+							NUM_CHAN : (usbdata_final[`CHANNEL]);
+	
+	always @(posedge txclk)
+	  begin
+	    if (reset)
+	      begin
+	       reader_state <= IDLE;
+	       WR_channel <= 0;
+	       WR_done_channel <= 0;
+	      end
+	      else
+	        case (reader_state)
+	        IDLE: begin
+	            if (WR_final)
+	                reader_state <= HEADER; 
+	            end
+	       
+            // Store channel and forware header
+	        HEADER: begin
+	            channel <= true_channel;
+	            WR_channel[true_channel] <= 1;
+	            ram_data <= usbdata_final;
+				read_length <= 7'd0 ;
+				
+                reader_state <= WAIT;
+	        end
+	       
+	        WAIT: begin
+	           WR_channel[channel] <= 0;
+	
+			   if (read_length == `PKT_SIZE)
+	               reader_state <= IDLE;
+	           else if (WR_final)
+	               reader_state <= FORWARD;
+	        end
+	       
+	        FORWARD: begin
+	           WR_channel[channel] <= 1;
+	           ram_data <= usbdata_final;
+	           read_length <= read_length + 7'd1;
+	           
+	           reader_state <= WAIT;
+	        end
+	
+			default:
+               begin
+					//error handling
+                   reader_state <= IDLE;
+               end
+	       endcase
+	   end
+endmodule
-- 
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