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/*
 * ptp_parser.v
 *
 * Copyright (c) 2012, BABY&HW. All rights reserved.
 *
 * This library is free software; you can redistribute it and/or
 * modify it under the terms of the GNU Lesser General Public
 * License as published by the Free Software Foundation; either
 * version 2.1 of the License, or (at your option) any later version.
 *
 * This library 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
 * Lesser General Public License for more details.
 *
 * You should have received a copy of the GNU Lesser General Public
 * License along with this library; if not, write to the Free Software
 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston,
 * MA 02110-1301  USA
 */
 
`timescale 1ns/1ns
 
module ptp_parser (
  input        clk, rst,
  input [31:0] int_data,
  input        int_valid,
  input        int_sop,
  input        int_eop,
  input [ 1:0] int_mod,
 
  input [ 7:0] ptp_msgid_mask,
 
  output reg        ptp_found,
  output reg [31:0] ptp_infor
);
 
// constant values
parameter c_vlan_tpid_1 = 16'h8100;
parameter c_vlan_tpid_2 = 16'h88a8;
parameter c_vlan_tpid_3 = 16'h9100;
 
parameter c_mpls_type_1 = 16'h8847;
parameter c_mpls_type_2 = 16'h8848;
 
parameter c_ipv4_type   = 16'h0800;
parameter c_ipv6_type   = 16'h86dd;
 
parameter c_ptp2_type   = 16'h88f7;
parameter c_ptp4_port_1 = 16'h013f;
parameter c_ptp4_port_2 = 16'h0140;
 
// buffer data input
reg [31:0] int_data_d1;
always @(posedge rst or posedge clk) begin
  if (rst) begin
    int_data_d1  <= 32'h00000000;
  end
  else begin
    if (int_valid) begin
      int_data_d1  <= int_data;
    end
  end
end
 
// packet parser: counter
reg [ 9:0] int_cnt, bypass_ipv4_cnt, bypass_ipv6_cnt, bypass_udp_cnt, ptp_cnt;
reg bypass_vlan, ptp_l2, bypass_mpls, bypass_ipv4, bypass_ipv6, found_udp, bypass_udp, ptp_l4, ptp_event;
always @(posedge rst or posedge clk) begin
  if (rst) begin
    int_cnt <= 10'd0;
    bypass_ipv4_cnt <= 10'd0;
    bypass_ipv6_cnt <= 10'd0;
    bypass_udp_cnt <= 10'd0;
  end
  else begin
    if (int_valid && int_sop)
      int_cnt <= 10'd0;
    else if (int_valid)
      int_cnt <= int_cnt + 10'd1 - bypass_vlan - bypass_mpls - (bypass_ipv4 || bypass_ipv6 || bypass_udp);
 
    if (int_valid && int_sop)
      bypass_ipv4_cnt <= 10'd0;
    else if (int_valid && bypass_ipv4)
      bypass_ipv4_cnt <= bypass_ipv4_cnt + 10'd1;
 
    if (int_valid && int_sop)
      bypass_ipv6_cnt <= 10'd0;
    else if (int_valid && bypass_ipv6)
      bypass_ipv6_cnt <= bypass_ipv6_cnt + 10'd1;
 
    if (int_valid && int_sop)
      bypass_udp_cnt <= 10'd0;
    else if (int_valid && bypass_udp)
      bypass_udp_cnt <= bypass_udp_cnt + 10'd1;
 
    if (int_valid && int_sop)
      ptp_cnt <= 10'd0;
    else if (int_valid && (ptp_l2 || (bypass_udp_cnt>=10'd2 && ptp_l4)))
      ptp_cnt <= ptp_cnt + 10'd1;
  end
end
 
// packet parser: comparator
always @(posedge rst or posedge clk) begin
  if (rst) begin
    bypass_vlan  <= 1'b0;
    bypass_mpls  <= 1'b0;
    bypass_ipv4  <= 1'b0;
    bypass_ipv6  <= 1'b0;
    found_udp    <= 1'b0;
    bypass_udp   <= 1'b0;
    ptp_l2    <= 1'b0;
    ptp_l4    <= 1'b0;
    ptp_event <= 1'b0;
  end
  else if (int_valid && int_sop) begin
    bypass_vlan  <= 1'b0;
    bypass_mpls  <= 1'b0;
    bypass_ipv4  <= 1'b0;
    bypass_ipv6  <= 1'b0;
    found_udp    <= 1'b0;
    bypass_udp   <= 1'b0;
    ptp_l2    <= 1'b0;
    ptp_l4    <= 1'b0;
    ptp_event <= 1'b0;
  end
  else begin
    // bypass vlan
    if      (int_valid && int_cnt==10'd4 && (int_data[31:16]==c_vlan_tpid_1 || int_data[31:16]==c_vlan_tpid_2 || int_data[31:16]==c_vlan_tpid_3))  // ether_type == vlan
      bypass_vlan <= 1'b1;
    else if (int_valid && int_cnt==10'd5 && (int_data[31:16]==c_vlan_tpid_1 || int_data[31:16]==c_vlan_tpid_2 || int_data[31:16]==c_vlan_tpid_3) && bypass_vlan)  // vlan_type == vlan
      bypass_vlan <= 1'b1;
    else if (int_valid && bypass_vlan)
      bypass_vlan <= 1'b0;
 
    // bypass mpls
    if      (int_valid && (int_cnt==10'd4 || bypass_vlan && int_cnt==10'd5) &&
            (int_data[31:16]==c_mpls_type_1 || int_data[31:16]==c_mpls_type_2))  // ether_type == mpls
      bypass_mpls <= 1'b1;
    else if (int_valid &&  int_cnt==10'd5 && bypass_mpls &&
             int_data[24]==1'b0)  // bottom of label stack == 0
      bypass_mpls <= 1'b1;
    else if (int_valid && bypass_mpls)
      bypass_mpls <= 1'b0;
 
    // bypass ipv4
    if      (int_valid && (int_cnt==10'd4 || (bypass_vlan || bypass_mpls) && int_cnt==10'd5) && bypass_ipv4_cnt==10'd0 &&
            (int_data[31:16]==c_ipv4_type || bypass_mpls) && int_data[15:12]==4'h4)  // ether_type == ipv4, ip_version == 4
      bypass_ipv4 <= 1'b1;
    else if (int_valid && bypass_ipv4_cnt==10'd4)
      bypass_ipv4 <= 1'b0;
 
    // bypass ipv6
    if      (int_valid && (int_cnt==10'd4 || (bypass_vlan || bypass_mpls) && int_cnt==10'd5) && bypass_ipv6_cnt==10'd0 &&
            (int_data[31:16]==c_ipv6_type || bypass_mpls) && int_data[15:12]==4'h6)  // ether_type == ipv6, ip_version == 6
      bypass_ipv6 <= 1'b1;
    else if (int_valid && bypass_ipv6_cnt==10'd9)
      bypass_ipv6 <= 1'b0;
 
    // check if it is udp
    if      (int_valid && bypass_ipv4_cnt==10'd1 && int_data[ 7: 0]== 8'h11)  // ipv4_protocol == udp
      found_udp <= 1'b1;
    else if (int_valid && bypass_ipv6_cnt==10'd1 && int_data[31:24]== 8'h11)  // ipv6_protocol == udp
      found_udp <= 1'b1;
 
    // bypass udp
    if      (int_valid && bypass_ipv4_cnt==10'd4 && bypass_udp_cnt==10'd0 && found_udp)  // ipv4_udp
      bypass_udp <= 1'b1;
    else if (int_valid && bypass_ipv6_cnt==10'd9 && bypass_udp_cnt==10'd0 && found_udp)  // ipv6_udp
      bypass_udp <= 1'b1;
    else if (int_valid && bypass_udp_cnt==10'd2)
      bypass_udp <= 1'b0;
 
    // check if it is L2 PTP
    if (int_valid && (int_cnt==10'd4 || bypass_vlan && int_cnt==10'd5) && int_data[31:16]==c_ptp2_type)  // ether_type == ptp
      ptp_l2 <= 1'b1;
    // check if it is L4 PTP
    if (int_valid && bypass_udp_cnt==10'd0 && bypass_udp &&
       (int_data[31:16]==c_ptp4_port_1 || int_data[31:16]==c_ptp4_port_2))  // udp_dest_port == ptp_event || ptp_general
      ptp_l4 <= 1'b1;
 
    // check if it is PTP Event message
    if      (int_valid && (int_cnt==10'd4 || bypass_vlan && int_cnt==10'd5) && int_data[31:16]==c_ptp2_type &&
            (ptp_msgid_mask[int_data[11: 8]]))  // ptp_message_id == ptp_event
      ptp_event <= 1'b1;
    else if (int_valid && int_cnt==10'd5 && bypass_udp_cnt==10'd1 && ptp_l4 &&
            (ptp_msgid_mask[int_data[11: 8]]))  // ptp_message_id == ptp_event 
      ptp_event <= 1'b1;
  end
end
 
// ptp message
reg [31:0] ptp_data;
reg [ 3:0] ptp_msgid;
reg [15:0] ptp_seqid;
reg [11:0] ptp_cksum;
always @(posedge rst or posedge clk) begin
  if (rst) begin
    ptp_data  <= 32'd0;
    ptp_msgid <= 4'd0;
    ptp_seqid <= 16'd0;
    ptp_cksum <= 12'd0;
  end
  else if (int_valid && int_sop) begin
    ptp_data  <= 32'd0;
    ptp_msgid <= 4'd0;
    ptp_seqid <= 16'd0;
    ptp_cksum <= 12'd0;
  end
  else begin
    // get PTP identification information as additional information to Timestamp
    // ptp message body
    if (int_valid && (ptp_l2 || (bypass_udp_cnt>=10'd2 && ptp_l4)))
      ptp_data <= {int_data_d1[15:0], int_data[31:16]};
    // message id
    if (int_valid && ptp_cnt==10'd1)
      ptp_msgid <= ptp_data[27:24];
    // sequence id
    if (int_valid && ptp_cnt==10'd8)
      ptp_seqid <= ptp_data[15:0];
    // sum up clock id and source port id
    if (int_valid && ptp_cnt==10'd6)
      ptp_cksum <= ptp_data[31:24] + ptp_data[23:16] + ptp_data[15: 8] + ptp_data[ 7: 0] + ptp_cksum;
    if (int_valid && ptp_cnt==10'd7)
      ptp_cksum <= ptp_data[31:24] + ptp_data[23:16] + ptp_data[15: 8] + ptp_data[ 7: 0] + ptp_cksum;
    if (int_valid && ptp_cnt==10'd8)
      ptp_cksum <= ptp_data[31:24] + ptp_data[23:16]                                     + ptp_cksum;
  end
end
 
// parser output
always @(posedge rst or posedge clk) begin
  if (rst) begin
    ptp_found <=  1'b0;
    ptp_infor <= 32'd0;
  end
  else if (int_valid && int_sop) begin
    ptp_found <=  1'b0;
    ptp_infor <= 32'd0;
  end
  else if (int_valid && ptp_cnt==10'd9) begin
    ptp_found <=  ptp_event;
    ptp_infor <= {ptp_msgid, ptp_cksum, ptp_seqid};  // 4+12+16
  end
end
 
endmodule

Line No.	Rev	Author	Line
1	34	edn_walter	`/*`
2	38	edn_walter	`* ptp_parser.v`
3	34	edn_walter	`*`
4	37	edn_walter	`* Copyright (c) 2012, BABY&HW. All rights reserved.`
5	34	edn_walter	`*`
6			`* This library is free software; you can redistribute it and/or`
7			`* modify it under the terms of the GNU Lesser General Public`
8			`* License as published by the Free Software Foundation; either`
9			`* version 2.1 of the License, or (at your option) any later version.`
10			`*`
11			`* This library is distributed in the hope that it will be useful,`
12			`* but WITHOUT ANY WARRANTY; without even the implied warranty of`
13			`* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU`
14			`* Lesser General Public License for more details.`
15			`*`
16			`* You should have received a copy of the GNU Lesser General Public`
17			`* License along with this library; if not, write to the Free Software`
18			`* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston,`
19			`* MA 02110-1301 USA`
20			`*/`
21
22	4	ash_riple	`timescale 1ns/1ns
23
24			`module ptp_parser (`
25			`input clk, rst,`
26	10	edn_walter	`input [31:0] int_data,`
27			`input int_valid,`
28			`input int_sop,`
29			`input int_eop,`
30			`input [ 1:0] int_mod,`
31	4	ash_riple
32	43	edn_walter	`input [ 7:0] ptp_msgid_mask,`
33
34	4	ash_riple	`output reg ptp_found,`
35	37	edn_walter	`output reg [31:0] ptp_infor`
36	4	ash_riple	`);`
37
38	57	edn_walter	`// constant values`
39	56	edn_walter	`parameter c_vlan_tpid_1 = 16'h8100;`
40			`parameter c_vlan_tpid_2 = 16'h88a8;`
41			`parameter c_vlan_tpid_3 = 16'h9100;`
42
43	57	edn_walter	`parameter c_mpls_type_1 = 16'h8847;`
44			`parameter c_mpls_type_2 = 16'h8848;`
45
46			`parameter c_ipv4_type = 16'h0800;`
47			`parameter c_ipv6_type = 16'h86dd;`
48
49			`parameter c_ptp2_type = 16'h88f7;`
50			`parameter c_ptp4_port_1 = 16'h013f;`
51			`parameter c_ptp4_port_2 = 16'h0140;`
52
53			`// buffer data input`
54	10	edn_walter	`reg [31:0] int_data_d1;`
55	4	ash_riple	`always @(posedge rst or posedge clk) begin`
56			`if (rst) begin`
57	10	edn_walter	`int_data_d1 <= 32'h00000000;`
58	4	ash_riple	`end`
59			`else begin`
60	10	edn_walter	`if (int_valid) begin`
61			`int_data_d1 <= int_data;`
62	4	ash_riple	`end`
63			`end`
64			`end`
65
66	29	edn_walter	`// packet parser: counter`
67	10	edn_walter	`reg [ 9:0] int_cnt, bypass_ipv4_cnt, bypass_ipv6_cnt, bypass_udp_cnt, ptp_cnt;`
68	35	edn_walter	`reg bypass_vlan, ptp_l2, bypass_mpls, bypass_ipv4, bypass_ipv6, found_udp, bypass_udp, ptp_l4, ptp_event;`
69	4	ash_riple	`always @(posedge rst or posedge clk) begin`
70	10	edn_walter	`if (rst) begin`
71			`int_cnt <= 10'd0;`
72			`bypass_ipv4_cnt <= 10'd0;`
73	11	edn_walter	`bypass_ipv6_cnt <= 10'd0;`
74	10	edn_walter	`bypass_udp_cnt <= 10'd0;`
75			`end`
76			`else begin`
77	29	edn_walter	`if (int_valid && int_sop)`
78	10	edn_walter	`int_cnt <= 10'd0;`
79	29	edn_walter	`else if (int_valid)`
80	35	edn_walter	`int_cnt <= int_cnt + 10'd1 - bypass_vlan - bypass_mpls - (bypass_ipv4 \|\| bypass_ipv6 \|\| bypass_udp);`
81	10	edn_walter
82	29	edn_walter	`if (int_valid && int_sop)`
83	10	edn_walter	`bypass_ipv4_cnt <= 10'd0;`
84	29	edn_walter	`else if (int_valid && bypass_ipv4)`
85	10	edn_walter	`bypass_ipv4_cnt <= bypass_ipv4_cnt + 10'd1;`
86
87	29	edn_walter	`if (int_valid && int_sop)`
88	11	edn_walter	`bypass_ipv6_cnt <= 10'd0;`
89	29	edn_walter	`else if (int_valid && bypass_ipv6)`
90	11	edn_walter	`bypass_ipv6_cnt <= bypass_ipv6_cnt + 10'd1;`
91
92	29	edn_walter	`if (int_valid && int_sop)`
93	10	edn_walter	`bypass_udp_cnt <= 10'd0;`
94	29	edn_walter	`else if (int_valid && bypass_udp)`
95	10	edn_walter	`bypass_udp_cnt <= bypass_udp_cnt + 10'd1;`
96	29	edn_walter
97			`if (int_valid && int_sop)`
98			`ptp_cnt <= 10'd0;`
99			`else if (int_valid && (ptp_l2 \|\| (bypass_udp_cnt>=10'd2 && ptp_l4)))`
100			`ptp_cnt <= ptp_cnt + 10'd1;`
101	10	edn_walter	`end`
102	4	ash_riple	`end`
103
104	29	edn_walter	`// packet parser: comparator`
105	4	ash_riple	`always @(posedge rst or posedge clk) begin`
106			`if (rst) begin`
107	10	edn_walter	`bypass_vlan <= 1'b0;`
108	35	edn_walter	`bypass_mpls <= 1'b0;`
109	10	edn_walter	`bypass_ipv4 <= 1'b0;`
110	11	edn_walter	`bypass_ipv6 <= 1'b0;`
111	10	edn_walter	`found_udp <= 1'b0;`
112			`bypass_udp <= 1'b0;`
113			`ptp_l2 <= 1'b0;`
114			`ptp_l4 <= 1'b0;`
115	4	ash_riple	`ptp_event <= 1'b0;`
116	10	edn_walter	`end`
117	29	edn_walter	`else if (int_valid && int_sop) begin`
118	10	edn_walter	`bypass_vlan <= 1'b0;`
119	35	edn_walter	`bypass_mpls <= 1'b0;`
120	10	edn_walter	`bypass_ipv4 <= 1'b0;`
121	11	edn_walter	`bypass_ipv6 <= 1'b0;`
122	10	edn_walter	`found_udp <= 1'b0;`
123			`bypass_udp <= 1'b0;`
124			`ptp_l2 <= 1'b0;`
125			`ptp_l4 <= 1'b0;`
126			`ptp_event <= 1'b0;`
127			`end`
128			`else begin`
129			`// bypass vlan`
130	56	edn_walter	`if (int_valid && int_cnt==10'd4 && (int_data[31:16]==c_vlan_tpid_1 \|\| int_data[31:16]==c_vlan_tpid_2 \|\| int_data[31:16]==c_vlan_tpid_3)) // ether_type == vlan`
131	10	edn_walter	`bypass_vlan <= 1'b1;`
132	56	edn_walter	`else if (int_valid && int_cnt==10'd5 && (int_data[31:16]==c_vlan_tpid_1 \|\| int_data[31:16]==c_vlan_tpid_2 \|\| int_data[31:16]==c_vlan_tpid_3) && bypass_vlan) // vlan_type == vlan`
133	12	edn_walter	`bypass_vlan <= 1'b1;`
134	29	edn_walter	`else if (int_valid && bypass_vlan)`
135	10	edn_walter	`bypass_vlan <= 1'b0;`
136
137	35	edn_walter	`// bypass mpls`
138	52	edn_walter	`if (int_valid && (int_cnt==10'd4 \|\| bypass_vlan && int_cnt==10'd5) &&`
139	57	edn_walter	`(int_data[31:16]==c_mpls_type_1 \|\| int_data[31:16]==c_mpls_type_2)) // ether_type == mpls`
140	35	edn_walter	`bypass_mpls <= 1'b1;`
141	52	edn_walter	`else if (int_valid && int_cnt==10'd5 && bypass_mpls &&`
142	35	edn_walter	`int_data[24]==1'b0) // bottom of label stack == 0`
143			`bypass_mpls <= 1'b1;`
144			`else if (int_valid && bypass_mpls)`
145			`bypass_mpls <= 1'b0;`
146
147	10	edn_walter	`// bypass ipv4`
148	52	edn_walter	`if (int_valid && (int_cnt==10'd4 \|\| (bypass_vlan \|\| bypass_mpls) && int_cnt==10'd5) && bypass_ipv4_cnt==10'd0 &&`
149	57	edn_walter	`(int_data[31:16]==c_ipv4_type \|\| bypass_mpls) && int_data[15:12]==4'h4) // ether_type == ipv4, ip_version == 4`
150	10	edn_walter	`bypass_ipv4 <= 1'b1;`
151	29	edn_walter	`else if (int_valid && bypass_ipv4_cnt==10'd4)`
152	10	edn_walter	`bypass_ipv4 <= 1'b0;`
153
154			`// bypass ipv6`
155	52	edn_walter	`if (int_valid && (int_cnt==10'd4 \|\| (bypass_vlan \|\| bypass_mpls) && int_cnt==10'd5) && bypass_ipv6_cnt==10'd0 &&`
156	57	edn_walter	`(int_data[31:16]==c_ipv6_type \|\| bypass_mpls) && int_data[15:12]==4'h6) // ether_type == ipv6, ip_version == 6`
157	11	edn_walter	`bypass_ipv6 <= 1'b1;`
158	29	edn_walter	`else if (int_valid && bypass_ipv6_cnt==10'd9)`
159	11	edn_walter	`bypass_ipv6 <= 1'b0;`
160	10	edn_walter
161	52	edn_walter	`// check if it is udp`
162	29	edn_walter	`if (int_valid && bypass_ipv4_cnt==10'd1 && int_data[ 7: 0]== 8'h11) // ipv4_protocol == udp`
163	10	edn_walter	`found_udp <= 1'b1;`
164	29	edn_walter	`else if (int_valid && bypass_ipv6_cnt==10'd1 && int_data[31:24]== 8'h11) // ipv6_protocol == udp`
165	11	edn_walter	`found_udp <= 1'b1;`
166	10	edn_walter
167			`// bypass udp`
168	29	edn_walter	`if (int_valid && bypass_ipv4_cnt==10'd4 && bypass_udp_cnt==10'd0 && found_udp) // ipv4_udp`
169	10	edn_walter	`bypass_udp <= 1'b1;`
170	29	edn_walter	`else if (int_valid && bypass_ipv6_cnt==10'd9 && bypass_udp_cnt==10'd0 && found_udp) // ipv6_udp`
171	11	edn_walter	`bypass_udp <= 1'b1;`
172	29	edn_walter	`else if (int_valid && bypass_udp_cnt==10'd2)`
173	11	edn_walter	`bypass_udp <= 1'b0;`
174	10	edn_walter
175			`// check if it is L2 PTP`
176	57	edn_walter	`if (int_valid && (int_cnt==10'd4 \|\| bypass_vlan && int_cnt==10'd5) && int_data[31:16]==c_ptp2_type) // ether_type == ptp`
177	10	edn_walter	`ptp_l2 <= 1'b1;`
178			`// check if it is L4 PTP`
179	29	edn_walter	`if (int_valid && bypass_udp_cnt==10'd0 && bypass_udp &&`
180	57	edn_walter	`(int_data[31:16]==c_ptp4_port_1 \|\| int_data[31:16]==c_ptp4_port_2)) // udp_dest_port == ptp_event \|\| ptp_general`
181	10	edn_walter	`ptp_l4 <= 1'b1;`
182
183			`// check if it is PTP Event message`
184	57	edn_walter	`if (int_valid && (int_cnt==10'd4 \|\| bypass_vlan && int_cnt==10'd5) && int_data[31:16]==c_ptp2_type &&`
185	43	edn_walter	`(ptp_msgid_mask[int_data[11: 8]])) // ptp_message_id == ptp_event`
186	10	edn_walter	`ptp_event <= 1'b1;`
187	52	edn_walter	`else if (int_valid && int_cnt==10'd5 && bypass_udp_cnt==10'd1 && ptp_l4 &&`
188	43	edn_walter	`(ptp_msgid_mask[int_data[11: 8]])) // ptp_message_id == ptp_event`
189	10	edn_walter	`ptp_event <= 1'b1;`
190			`end`
191			`end`
192
193	29	edn_walter	`// ptp message`
194			`reg [31:0] ptp_data;`
195	37	edn_walter	`reg [ 3:0] ptp_msgid;`
196			`reg [15:0] ptp_seqid;`
197			`reg [11:0] ptp_cksum;`
198	10	edn_walter	`always @(posedge rst or posedge clk) begin`
199			`if (rst) begin`
200	29	edn_walter	`ptp_data <= 32'd0;`
201	7	edn_walter	`ptp_msgid <= 4'd0;`
202	8	edn_walter	`ptp_seqid <= 16'd0;`
203	37	edn_walter	`ptp_cksum <= 12'd0;`
204	4	ash_riple	`end`
205	29	edn_walter	`else if (int_valid && int_sop) begin`
206			`ptp_data <= 32'd0;`
207	7	edn_walter	`ptp_msgid <= 4'd0;`
208	8	edn_walter	`ptp_seqid <= 16'd0;`
209	37	edn_walter	`ptp_cksum <= 12'd0;`
210	4	ash_riple	`end`
211			`else begin`
212	10	edn_walter	`// get PTP identification information as additional information to Timestamp`
213	29	edn_walter	`// ptp message body`
214			`if (int_valid && (ptp_l2 \|\| (bypass_udp_cnt>=10'd2 && ptp_l4)))`
215			`ptp_data <= {int_data_d1[15:0], int_data[31:16]};`
216	10	edn_walter	`// message id`
217	29	edn_walter	`if (int_valid && ptp_cnt==10'd1)`
218	37	edn_walter	`ptp_msgid <= ptp_data[27:24];`
219	10	edn_walter	`// sequence id`
220	29	edn_walter	`if (int_valid && ptp_cnt==10'd8)`
221	37	edn_walter	`ptp_seqid <= ptp_data[15:0];`
222			`// sum up clock id and source port id`
223			`if (int_valid && ptp_cnt==10'd6)`
224			`ptp_cksum <= ptp_data[31:24] + ptp_data[23:16] + ptp_data[15: 8] + ptp_data[ 7: 0] + ptp_cksum;`
225			`if (int_valid && ptp_cnt==10'd7)`
226			`ptp_cksum <= ptp_data[31:24] + ptp_data[23:16] + ptp_data[15: 8] + ptp_data[ 7: 0] + ptp_cksum;`
227			`if (int_valid && ptp_cnt==10'd8)`
228			`ptp_cksum <= ptp_data[31:24] + ptp_data[23:16] + ptp_cksum;`
229	4	ash_riple	`end`
230			`end`
231
232	29	edn_walter	`// parser output`
233	4	ash_riple	`always @(posedge rst or posedge clk) begin`
234			`if (rst) begin`
235			`ptp_found <= 1'b0;`
236	37	edn_walter	`ptp_infor <= 32'd0;`
237	4	ash_riple	`end`
238	29	edn_walter	`else if (int_valid && int_sop) begin`
239	4	ash_riple	`ptp_found <= 1'b0;`
240	37	edn_walter	`ptp_infor <= 32'd0;`
241	4	ash_riple	`end`
242	29	edn_walter	`else if (int_valid && ptp_cnt==10'd9) begin`
243	4	ash_riple	`ptp_found <= ptp_event;`
244	37	edn_walter	`ptp_infor <= {ptp_msgid, ptp_cksum, ptp_seqid}; // 4+12+16`
245	4	ash_riple	`end`
246			`end`
247
248			`endmodule`

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