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module context_packet_gen
(input clk, input reset, input clear,
input trigger,
input [11:0] seqnum,
input [31:0] sid,
input [63:0] body,
input [63:0] vita_time,
output done,
output reg [63:0] o_tdata, output o_tlast, output o_tvalid, input o_tready);
reg [1:0] cp_state;
localparam CP_IDLE = 2'd0;
localparam CP_HEAD = 2'd1;
localparam CP_TIME = 2'd2;
localparam CP_DATA = 2'd3;
always @(posedge clk)
if(reset|clear)
cp_state <= CP_IDLE;
else
case(cp_state)
CP_IDLE :
if(trigger)
cp_state <= CP_HEAD;
CP_HEAD :
if(o_tready)
cp_state <= CP_TIME;
CP_TIME :
if(o_tready)
cp_state <= CP_DATA;
CP_DATA :
if(o_tready)
cp_state <= CP_IDLE;
endcase // case (cp_state)
assign o_tvalid = (cp_state != CP_IDLE);
assign o_tlast = (cp_state == CP_DATA);
always @*
case(cp_state)
CP_HEAD : o_tdata <= { 4'hA, seqnum, 16'd24, sid };
CP_TIME : o_tdata <= vita_time;
CP_DATA : o_tdata <= body;
default : o_tdata <= body;
endcase // case (cp_state)
assign done = o_tlast & o_tvalid & o_tready;
endmodule // context_packet_gen
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