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-rw-r--r--fpga/usrp3/lib/gpif2/gpif2_to_fifo64.v228
1 files changed, 123 insertions, 105 deletions
diff --git a/fpga/usrp3/lib/gpif2/gpif2_to_fifo64.v b/fpga/usrp3/lib/gpif2/gpif2_to_fifo64.v
index 3d60c7326..c6d50a59d 100644
--- a/fpga/usrp3/lib/gpif2/gpif2_to_fifo64.v
+++ b/fpga/usrp3/lib/gpif2/gpif2_to_fifo64.v
@@ -1,118 +1,136 @@
//
// Copyright 2012-2013 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/>.
+//
module gpif2_to_fifo64
-#(
+ #(
parameter FIFO_SIZE = 9
-)
-(
- //input interface
- input gpif_clk, input gpif_rst,
- input [31:0] i_tdata,
- input i_tlast,
- input i_tvalid,
- output i_tready,
- output fifo_has_space,
- output fifo_nearly_full,
-
- //output fifo interface
- input fifo_clk, input fifo_rst,
- output [63:0] o_tdata,
- output o_tlast,
- output o_tvalid,
- input o_tready,
-
- output bus_error,
- output [159:0] debug
-);
-
- wire [31:0] int_tdata;
- wire int_tlast;
- wire int_tvalid, int_tready;
-
- wire [31:0] int0_tdata; wire int0_tlast, int0_tvalid, int0_tready;
-
- //this fifo provides a space signal so we know a burst is possible
- localparam BURST_SIZE = (FIFO_SIZE < 8)? FIFO_SIZE : 8;
- wire [15:0] space;
-
-
- assign fifo_has_space = space >= (1 << BURST_SIZE);
- assign fifo_nearly_full = (space < 6); // 5 spaces left.
-
- axi_fifo #(.WIDTH(33), .SIZE(0)) ingress_timing_fifo
- (
- .clk(gpif_clk), .reset(gpif_rst), .clear(1'b0),
- .i_tdata({i_tlast, i_tdata}), .i_tvalid(i_tvalid), .i_tready(i_tready), .space(),
- .o_tdata({int0_tlast, int0_tdata}), .o_tvalid(int0_tvalid), .o_tready(int0_tready), .occupied()
- );
- axi_fifo #(.WIDTH(33), .SIZE(BURST_SIZE)) min_read_buff
+ )
(
- .clk(gpif_clk), .reset(gpif_rst), .clear(1'b0),
- .i_tdata({int0_tlast, int0_tdata}), .i_tvalid(int0_tvalid), .i_tready(int0_tready), .space(space),
- .o_tdata({int_tlast, int_tdata}), .o_tvalid(int_tvalid), .o_tready(int_tready), .occupied()
- );
-
- reg input_write_error;
-
- always @(posedge gpif_clk) input_write_error <= i_tvalid & ~i_tready;
-
+ //input interface
+ input gpif_clk,
+ input gpif_rst,
+ input [31:0] i_tdata,
+ input i_tlast,
+ input i_tvalid,
+ output i_tready,
+ output fifo_has_space,
+ output fifo_nearly_full,
- wire [31:0] chk_tdata;
- wire chk_tlast;
- wire chk_tvalid, chk_tready;
+ //output fifo interface
+ input fifo_clk,
+ input fifo_rst,
+ output [63:0] o_tdata,
+ output o_tlast,
+ output o_tvalid,
+ input o_tready,
- axi_fifo_2clk #(.WIDTH(33), .SIZE(0/*SRL*/)) cross_clock_fifo
- (
- .reset(fifo_rst | gpif_rst),
- .i_aclk(gpif_clk), .i_tdata({int_tlast, int_tdata}), .i_tvalid(int_tvalid), .i_tready(int_tready),
- .o_aclk(fifo_clk), .o_tdata({chk_tlast, chk_tdata}), .o_tvalid(chk_tvalid), .o_tready(chk_tready)
- );
-
- wire [31:0] o32_tdata;
- wire o32_tlast;
- wire o32_tvalid, o32_tready;
-
- //reframes a tlast from the vita header - and drops bad packets
- //*
- gpif2_error_checker #(.SIZE(FIFO_SIZE)) checker
- (
- .clk(fifo_clk), .reset(fifo_rst), .clear(1'b0),
- .i_tdata(chk_tdata), .i_tlast(chk_tlast), .i_tvalid(chk_tvalid), .i_tready(chk_tready),
- .o_tdata(o32_tdata), .o_tlast(o32_tlast), .o_tvalid(o32_tvalid), .o_tready(o32_tready),
- .bus_error(bus_error), .debug(debug[63:0])
- );
- //*/
- //assign o32_tdata = chk_tdata;
- //assign o32_tlast = chk_tlast;
- //assign o32_tvalid = chk_tvalid;
- //assign chk_tready = o32_tready;
-
- axi_fifo32_to_fifo64 fifo32_to_fifo64
- (
- .clk(fifo_clk), .reset(fifo_rst), .clear(1'b0),
- .i_tdata(o32_tdata), .i_tuser(2'b0/*always 32 bits*/), .i_tlast(o32_tlast), .i_tvalid(o32_tvalid), .i_tready(o32_tready),
- .o_tdata(o_tdata), .o_tuser(/*ignored cuz vita has len*/), .o_tlast(o_tlast), .o_tvalid(o_tvalid), .o_tready(o_tready)
- );
-
- assign debug[159:64] = {
- fifo_nearly_full, // 146
- space[9:0], // 145:136
- input_write_error, // 135
- int_tlast, // 134
- int_tready, // 133
- int_tvalid, // 132
- i_tlast, // 131
- i_tready, // 130
- fifo_has_space, // 129
- i_tvalid, // 128
- int_tdata[31:0], // 127:96
- i_tdata[31:0] // 95:64
- };
+ output bus_error,
+ output [31:0] debug
+ );
+ wire [31:0] int_tdata;
+ wire int_tlast;
+ wire int_tvalid, int_tready;
+
+ wire [31:0] int0_tdata;
+ wire int0_tlast, int0_tvalid, int0_tready;
+
+ //
+ // Generate flags that show if initial FIFO's can accept a maximum sized burst from the FX3
+ // or if the FIFO is about to fill.
+ //
+ localparam BURST_SIZE = (FIFO_SIZE < 8)? FIFO_SIZE : 8;
+ wire [15:0] space;
+ assign fifo_has_space = space >= (1 << BURST_SIZE);
+ assign fifo_nearly_full = (space < 6); // 5 spaces left.
+
+ //
+ // This FIFO is provdied purely to easy FPGA timing closure as data is comming from I/O pins.
+ //
+ axi_fifo #(.WIDTH(33), .SIZE(0)) ingress_timing_fifo
+ (
+ .clk(gpif_clk), .reset(gpif_rst), .clear(1'b0),
+ .i_tdata({i_tlast, i_tdata}), .i_tvalid(i_tvalid), .i_tready(i_tready), .space(),
+ .o_tdata({int0_tlast, int0_tdata}), .o_tvalid(int0_tvalid), .o_tready(int0_tready), .occupied()
+ );
+
+ //
+ // This FIFO provides space to accept a single burst from FX3 and it's fullness drives flags to GPIF2 logic
+ //
+ axi_fifo #(.WIDTH(33), .SIZE(BURST_SIZE)) min_read_buff
+ (
+ .clk(gpif_clk), .reset(gpif_rst), .clear(1'b0),
+ .i_tdata({int0_tlast, int0_tdata}), .i_tvalid(int0_tvalid), .i_tready(int0_tready), .space(space),
+ .o_tdata({int_tlast, int_tdata}), .o_tvalid(int_tvalid), .o_tready(int_tready), .occupied()
+ );
+
+ //
+ // This logic allows signals to cross from the GPIF2 clock domain to the BUS clock domain.
+ // It may now be obselete if bus_clk and gpif_clk are merged
+ //
+ wire [31:0] chk_tdata;
+ wire chk_tlast;
+ wire chk_tvalid, chk_tready;
+
+ axi_fifo_2clk #(.WIDTH(33), .SIZE(0/*SRL*/)) cross_clock_fifo
+ (
+ .reset(fifo_rst | gpif_rst),
+ .i_aclk(gpif_clk), .i_tdata({int_tlast, int_tdata}), .i_tvalid(int_tvalid), .i_tready(int_tready),
+ .o_aclk(fifo_clk), .o_tdata({chk_tlast, chk_tdata}), .o_tvalid(chk_tvalid), .o_tready(chk_tready)
+ );
+
+ //
+ // Performs basic tests on incomming packets such as testing if size on the wire patches
+ // the internal size field. Uses axi_packet_gate internally so can back pressure upstream if
+ // packet needs to be dropped.
+ //
+ wire [31:0] o32_tdata;
+ wire o32_tlast;
+ wire o32_tvalid, o32_tready;
+
+ gpif2_error_checker #(.SIZE(FIFO_SIZE)) checker
+ (
+ .clk(fifo_clk), .reset(fifo_rst), .clear(1'b0),
+ .i_tdata(chk_tdata), .i_tlast(chk_tlast), .i_tvalid(chk_tvalid), .i_tready(chk_tready),
+ .o_tdata(o32_tdata), .o_tlast(o32_tlast), .o_tvalid(o32_tvalid), .o_tready(o32_tready),
+ .bus_error(bus_error), .debug()
+ );
-
+ //assign o32_tdata = chk_tdata;
+ //assign o32_tlast = chk_tlast;
+ //assign o32_tvalid = chk_tvalid;
+ //assign chk_tready = o32_tready;
+
+ //
+ // Convert 32bit AXIS bus to 64bit
+ //
+ axi_fifo32_to_fifo64 fifo32_to_fifo64
+ (
+ .clk(fifo_clk), .reset(fifo_rst), .clear(1'b0),
+ .i_tdata(o32_tdata), .i_tuser(2'b0/*always 32 bits*/), .i_tlast(o32_tlast), .i_tvalid(o32_tvalid), .i_tready(o32_tready),
+ .o_tdata(o_tdata), .o_tuser(/*ignored cuz vita has len*/), .o_tlast(o_tlast), .o_tvalid(o_tvalid), .o_tready(o_tready)
+ );
+
+
+ /////////////////////////////////////////////
+ //
+ // Debug logic only
+ //
+ /////////////////////////////////////////////
+
endmodule //fifo_to_gpif2
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