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-rw-r--r--usrp2/fifo/Makefile.srcs5
-rw-r--r--usrp2/fifo/fifo_pacer.v24
-rw-r--r--usrp2/fifo/packet32_tb.v27
-rw-r--r--usrp2/fifo/packet_generator.v59
-rw-r--r--usrp2/fifo/packet_generator32.v21
-rw-r--r--usrp2/fifo/packet_tb.v29
-rw-r--r--usrp2/fifo/packet_verifier.v61
-rw-r--r--usrp2/fifo/packet_verifier32.v30
8 files changed, 256 insertions, 0 deletions
diff --git a/usrp2/fifo/Makefile.srcs b/usrp2/fifo/Makefile.srcs
index f0b5b7bae..c1287cd5c 100644
--- a/usrp2/fifo/Makefile.srcs
+++ b/usrp2/fifo/Makefile.srcs
@@ -28,4 +28,9 @@ fifo36_demux.v \
packet_router.v \
splitter36.v \
valve36.v \
+fifo_pacer.v \
+packet_generator32.v \
+packet_generator.v \
+packet_verifier32.v \
+packet_verifier.v \
))
diff --git a/usrp2/fifo/fifo_pacer.v b/usrp2/fifo/fifo_pacer.v
new file mode 100644
index 000000000..1bf03ab6e
--- /dev/null
+++ b/usrp2/fifo/fifo_pacer.v
@@ -0,0 +1,24 @@
+
+
+module fifo_pacer
+ (input clk,
+ input reset,
+ input [7:0] rate,
+ input enable,
+ input src1_rdy_i, output dst1_rdy_o,
+ output src2_rdy_o, input dst2_rdy_i,
+ output underrun, overrun);
+
+ wire strobe;
+
+ cic_strober strober (.clock(clk), .reset(reset), .enable(enable),
+ .rate(rate), .strobe_fast(1), .strobe_slow(strobe));
+
+ wire all_ready = src1_rdy_i & dst2_rdy_i;
+ assign dst1_rdy_o = all_ready & strobe;
+ assign src2_rdy_o = dst1_rdy_o;
+
+ assign underrun = strobe & ~src1_rdy_i;
+ assign overrun = strobe & ~dst2_rdy_i;
+
+endmodule // fifo_pacer
diff --git a/usrp2/fifo/packet32_tb.v b/usrp2/fifo/packet32_tb.v
new file mode 100644
index 000000000..82bb09c29
--- /dev/null
+++ b/usrp2/fifo/packet32_tb.v
@@ -0,0 +1,27 @@
+
+
+module packet32_tb();
+
+ wire [35:0] data;
+ wire src_rdy, dst_rdy;
+
+ wire clear = 0;
+ reg clk = 0;
+ reg reset = 1;
+
+ always #10 clk <= ~clk;
+ initial #1000 reset <= 0;
+
+ initial $dumpfile("packet32_tb.vcd");
+ initial $dumpvars(0,packet32_tb);
+
+ wire [31:0] total, crc_err, seq_err, len_err;
+
+ packet_generator32 pkt_gen (.clk(clk), .reset(reset), .clear(clear),
+ .data_o(data), .src_rdy_o(src_rdy), .dst_rdy_i(dst_rdy));
+
+ packet_verifier32 pkt_ver (.clk(clk), .reset(reset), .clear(clear),
+ .data_i(data), .src_rdy_i(src_rdy), .dst_rdy_o(dst_rdy),
+ .total(total), .crc_err(crc_err), .seq_err(seq_err), .len_err(len_err));
+
+endmodule // packet32_tb
diff --git a/usrp2/fifo/packet_generator.v b/usrp2/fifo/packet_generator.v
new file mode 100644
index 000000000..6e8b45ccd
--- /dev/null
+++ b/usrp2/fifo/packet_generator.v
@@ -0,0 +1,59 @@
+
+
+module packet_generator
+ (input clk, input reset, input clear,
+ output reg [7:0] data_o, output sof_o, output eof_o,
+ output src_rdy_o, input dst_rdy_i);
+
+ localparam len = 32'd2000;
+
+ reg [31:0] state;
+ reg [31:0] seq;
+ wire [31:0] crc_out;
+ wire calc_crc = src_rdy_o & dst_rdy_i & ~(state[31:2] == 30'h3FFF_FFFF);
+
+
+ always @(posedge clk)
+ if(reset | clear)
+ seq <= 0;
+ else
+ if(eof_o & src_rdy_o & dst_rdy_i)
+ seq <= seq + 1;
+
+ always @(posedge clk)
+ if(reset | clear)
+ state <= 0;
+ else
+ if(src_rdy_o & dst_rdy_i)
+ if(state == (len - 1))
+ state <= 32'hFFFF_FFFC;
+ else
+ state <= state + 1;
+
+ always @*
+ case(state)
+ 0 : data_o <= len[7:0];
+ 1 : data_o <= len[15:8];
+ 2 : data_o <= len[23:16];
+ 3 : data_o <= len[31:24];
+ 4 : data_o <= seq[7:0];
+ 5 : data_o <= seq[15:8];
+ 6 : data_o <= seq[23:16];
+ 7 : data_o <= seq[31:24];
+ 32'hFFFF_FFFC : data_o <= crc_out[31:24];
+ 32'hFFFF_FFFD : data_o <= crc_out[23:16];
+ 32'hFFFF_FFFE : data_o <= crc_out[15:8];
+ 32'hFFFF_FFFF : data_o <= crc_out[7:0];
+ default : data_o <= state[7:0];
+ endcase // case (state)
+
+ assign src_rdy_o = 1;
+ assign sof_o = (state == 0);
+ assign eof_o = (state == 32'hFFFF_FFFF);
+
+ wire clear_crc = eof_o & src_rdy_o & dst_rdy_i;
+
+ crc crc(.clk(clk), .reset(reset), .clear(clear_crc), .data(data_o),
+ .calc(calc_crc), .crc_out(crc_out), .match());
+
+endmodule // packet_generator
diff --git a/usrp2/fifo/packet_generator32.v b/usrp2/fifo/packet_generator32.v
new file mode 100644
index 000000000..6f8004964
--- /dev/null
+++ b/usrp2/fifo/packet_generator32.v
@@ -0,0 +1,21 @@
+
+
+module packet_generator32
+ (input clk, input reset, input clear,
+ output [35:0] data_o, output src_rdy_o, input dst_rdy_i);
+
+ wire [7:0] ll_data;
+ wire ll_sof, ll_eof, ll_src_rdy, ll_dst_rdy_n;
+
+ packet_generator pkt_gen
+ (.clk(clk), .reset(reset), .clear(clear),
+ .data_o(ll_data), .sof_o(ll_sof), .eof_o(ll_eof),
+ .src_rdy_o(ll_src_rdy), .dst_rdy_i(~ll_dst_rdy_n));
+
+ ll8_to_fifo36 ll8_to_f36
+ (.clk(clk), .reset(reset), .clear(clear),
+ .ll_data(ll_data), .ll_sof_n(~ll_sof), .ll_eof_n(~ll_eof),
+ .ll_src_rdy_n(~ll_src_rdy), .ll_dst_rdy_n(ll_dst_rdy_n),
+ .f36_data(data_o), .f36_src_rdy_o(src_rdy_o), .f36_dst_rdy_i(dst_rdy_i));
+
+endmodule // packet_generator32
diff --git a/usrp2/fifo/packet_tb.v b/usrp2/fifo/packet_tb.v
new file mode 100644
index 000000000..3c423d2ba
--- /dev/null
+++ b/usrp2/fifo/packet_tb.v
@@ -0,0 +1,29 @@
+
+
+module packet_tb();
+
+ wire [7:0] data;
+ wire sof, eof, src_rdy, dst_rdy;
+
+ wire clear = 0;
+ reg clk = 0;
+ reg reset = 1;
+
+ always #10 clk <= ~clk;
+ initial #1000 reset <= 0;
+
+ initial $dumpfile("packet_tb.vcd");
+ initial $dumpvars(0,packet_tb);
+
+ wire [31:0] total, crc_err, seq_err, len_err;
+
+ packet_generator pkt_gen (.clk(clk), .reset(reset), .clear(clear),
+ .data_o(data), .sof_o(sof), .eof_o(eof),
+ .src_rdy_o(src_rdy), .dst_rdy_i(dst_rdy));
+
+ packet_verifier pkt_ver (.clk(clk), .reset(reset), .clear(clear),
+ .data_i(data), .sof_i(sof), .eof_i(eof),
+ .src_rdy_i(src_rdy), .dst_rdy_o(dst_rdy),
+ .total(total), .crc_err(crc_err), .seq_err(seq_err), .len_err(len_err));
+
+endmodule // packet_tb
diff --git a/usrp2/fifo/packet_verifier.v b/usrp2/fifo/packet_verifier.v
new file mode 100644
index 000000000..b49ad1bbb
--- /dev/null
+++ b/usrp2/fifo/packet_verifier.v
@@ -0,0 +1,61 @@
+
+
+// Packet format --
+// Line 1 -- Length, 32 bits
+// Line 2 -- Sequence number, 32 bits
+// Last line -- CRC, 32 bits
+
+module packet_verifier
+ (input clk, input reset, input clear,
+ input [7:0] data_i, input sof_i, input eof_i, input src_rdy_i, output dst_rdy_o,
+
+ output reg [31:0] total,
+ output reg [31:0] crc_err,
+ output reg [31:0] seq_err,
+ output reg [31:0] len_err);
+
+ reg [31:0] seq_num;
+ reg [31:0] length;
+ wire first_byte, last_byte;
+ reg second_byte, last_byte_d1;
+
+ wire calc_crc = src_rdy_i & dst_rdy_o;
+
+ crc crc(.clk(clk), .reset(reset), .clear(last_byte_d1), .data(data_i),
+ .calc(calc_crc), .crc_out(), .match(match_crc));
+
+ assign first_byte = src_rdy_i & dst_rdy_o & sof_i;
+ assign last_byte = src_rdy_i & dst_rdy_o & eof_i;
+ assign dst_rdy_o = ~last_byte_d1;
+
+ // stubs for now
+ wire match_seq = 1;
+ wire match_len = 1;
+
+ always @(posedge clk)
+ if(reset | clear)
+ last_byte_d1 <= 0;
+ else
+ last_byte_d1 <= last_byte;
+
+ always @(posedge clk)
+ if(reset | clear)
+ begin
+ total <= 0;
+ crc_err <= 0;
+ seq_err <= 0;
+ len_err <= 0;
+ end
+ else
+ if(last_byte_d1)
+ begin
+ total <= total + 1;
+ if(~match_crc)
+ crc_err <= crc_err + 1;
+ else if(~match_seq)
+ seq_err <= seq_err + 1;
+ else if(~match_len)
+ seq_err <= len_err + 1;
+ end
+
+endmodule // packet_verifier
diff --git a/usrp2/fifo/packet_verifier32.v b/usrp2/fifo/packet_verifier32.v
new file mode 100644
index 000000000..06a13d242
--- /dev/null
+++ b/usrp2/fifo/packet_verifier32.v
@@ -0,0 +1,30 @@
+
+
+module packet_verifier32
+ (input clk, input reset, input clear,
+ input [35:0] data_i, input src_rdy_i, output dst_rdy_o,
+ output [31:0] total, output [31:0] crc_err, output [31:0] seq_err, output [31:0] len_err);
+
+ wire [7:0] ll_data;
+ wire ll_sof_n, ll_eof_n, ll_src_rdy_n, ll_dst_rdy;
+ wire [35:0] data_int;
+ wire src_rdy_int, dst_rdy_int;
+
+ fifo_short #(.WIDTH(36)) fifo_short
+ (.clk(clk), .reset(reset), .clear(clear),
+ .datain(data_i), .src_rdy_i(src_rdy_i), .dst_rdy_o(dst_rdy_o),
+ .dataout(data_int), .src_rdy_o(src_rdy_int), .dst_rdy_i(dst_rdy_int));
+
+ fifo36_to_ll8 f36_to_ll8
+ (.clk(clk), .reset(reset), .clear(clear),
+ .f36_data(data_int), .f36_src_rdy_i(src_rdy_int), .f36_dst_rdy_o(dst_rdy_int),
+ .ll_data(ll_data), .ll_sof_n(ll_sof_n), .ll_eof_n(ll_eof_n),
+ .ll_src_rdy_n(ll_src_rdy_n), .ll_dst_rdy_n(~ll_dst_rdy));
+
+ packet_verifier pkt_ver
+ (.clk(clk), .reset(reset), .clear(clear),
+ .data_i(ll_data), .sof_i(~ll_sof_n), .eof_i(~ll_eof_n),
+ .src_rdy_i(~ll_src_rdy_n), .dst_rdy_o(ll_dst_rdy),
+ .total(total), .crc_err(crc_err), .seq_err(seq_err), .len_err(len_err));
+
+endmodule // packet_verifier32
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