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[Commit-gnuradio] r5819 - gnuradio/branches/developers/matt/u2f/models
From: |
matt |
Subject: |
[Commit-gnuradio] r5819 - gnuradio/branches/developers/matt/u2f/models |
Date: |
Sat, 23 Jun 2007 18:37:27 -0600 (MDT) |
Author: matt
Date: 2007-06-23 18:37:25 -0600 (Sat, 23 Jun 2007)
New Revision: 5819
Added:
gnuradio/branches/developers/matt/u2f/models/cpld_model.v
Log:
moved from sim directory
Copied: gnuradio/branches/developers/matt/u2f/models/cpld_model.v (from rev
5774, gnuradio/branches/developers/matt/u2f/top/u2_sim/cpld_model.v)
===================================================================
--- gnuradio/branches/developers/matt/u2f/models/cpld_model.v
(rev 0)
+++ gnuradio/branches/developers/matt/u2f/models/cpld_model.v 2007-06-24
00:37:25 UTC (rev 5819)
@@ -0,0 +1,91 @@
+
+module cpld_model
+ (input aux_clk, input start, input mode, input done,
+ output dout, output sclk, output detached);
+
+ reg [7:0] rom[0:65535];
+
+ reg [15:0] addr;
+ reg [7:0] data;
+ assign dout = data[7];
+
+ reg sclk;
+
+ reg [2:0] state, bitcnt;
+
+ localparam IDLE = 3'd0;
+ localparam READ = 3'd1;
+ localparam BIT1 = 3'd2;
+ localparam BIT2 = 3'd3;
+ localparam DONE = 3'd4;
+ localparam DETACHED = 3'd5;
+ localparam ERROR = 3'd7;
+
+ integer i;
+ initial begin
+ for (i=0;i<65536;i=i+1) begin
+ rom[i] <= 32'h0;
+ end
+ #1 $readmemh("flash.rom",rom);
+ end
+
+ initial addr = 16'd0;
+ initial data = 8'd0;
+ initial state = IDLE;
+ initial bitcnt = 3'd0;
+ initial sclk = 1'b0;
+
+ always @(posedge aux_clk)
+ case(state)
+ IDLE :
+ if(start)
+ if(~mode)
+ state <= READ;
+ else
+ state <= ERROR;
+ READ :
+ // if(start)
+ // state <= ERROR;
+ //else
+ if(done)
+ state <= DONE;
+ else
+ begin
+ data <= rom[addr];
+ addr <= addr + 1;
+ bitcnt <= 3'd0;
+ if(addr==16'hFFFF)
+ state <= ERROR;
+ else
+ state <= BIT1;
+ end // else: !if(start)
+ BIT1 :
+ begin
+ sclk <= 1'b1;
+ state <= BIT2;
+ end
+ BIT2 :
+ begin
+ sclk <= 1'b0;
+ data <= {data[6:0],1'b0};
+ bitcnt <= bitcnt + 1;
+ if(bitcnt==7)
+ state <= READ;
+ else
+ state <=BIT1;
+ end
+ DONE :
+ begin
+ if(start)
+ state <= ERROR;
+ else
+ state <= DETACHED;
+ end
+ DETACHED :
+ if(start)
+ state <= ERROR;
+ endcase // case(state)
+
+ assign detached = (state == DETACHED) || (state == IDLE);
+
+endmodule // cpld_model
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