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//
// Copyright 2014 Ettus Research LLC
// Copyright 2018 Ettus Research, a National Instruments Company
//
// SPDX-License-Identifier: LGPL-3.0-or-later
//
module compressed_vita_to_vrlp
(input clk, input reset, input clear,
input [63:0] i_tdata, input i_tlast, input i_tvalid, output i_tready,
output [63:0] o_tdata, output [15:0] o_tuser, output o_tlast, output o_tvalid, input o_tready
);
wire [19:0] vrlp_size = 20'd3 + {4'b0000,i_tdata[47:32]};
reg odd_len;
reg [2:0] cv2v_state;
reg [63:0] o_tdata_int;
wire o_tlast_int, o_tvalid_int, o_tready_int;
localparam CV2V_VRLP = 3'd0; // VRLP header
localparam CV2V_VRT_ECH = 3'd1; // Extension context header
localparam CV2V_VRT_IFH = 3'd2; // IF Data header
localparam CV2V_BODY = 3'd3;
localparam CV2V_VEND_ODD = 3'd4;
localparam CV2V_VEND_EVEN = 3'd4;
always @(posedge clk)
if(reset | clear)
begin
cv2v_state <= CV2V_VRLP;
odd_len <= 1'b0;
end
else
case(cv2v_state)
CV2V_VRLP :
if(i_tvalid & o_tready_int)
begin
odd_len <= i_tdata[32];
if(i_tdata[63])
cv2v_state <= CV2V_VRT_ECH;
else
cv2v_state <= CV2V_VRT_IFH;
end
CV2V_VRT_ECH, CV2V_VRT_IFH :
if(i_tvalid & o_tready_int)
cv2v_state <= CV2V_BODY;
CV2V_BODY :
if(i_tlast & i_tvalid & o_tready_int)
if(odd_len)
cv2v_state <= CV2V_VRLP;
else
cv2v_state <= CV2V_VEND_EVEN;
CV2V_VEND_EVEN :
if(o_tready_int)
cv2v_state <= CV2V_VRLP;
endcase // case (cv2v_state)
assign i_tready = o_tready_int & (cv2v_state != CV2V_VRLP) & (cv2v_state != CV2V_VEND_EVEN);
assign o_tvalid_int = i_tvalid | (cv2v_state == CV2V_VEND_EVEN);
always @*
case(cv2v_state)
CV2V_VRLP : o_tdata_int <= { 32'h5652_4c50 /*VRLP*/, i_tdata[59:48] /*seqnum*/, vrlp_size[19:0] };
CV2V_VRT_ECH : o_tdata_int <= { 4'h5 /*type*/, 4'h0, 3'b00, i_tdata[61] /*time*/, i_tdata[51:48] /*seqnum*/, i_tdata[47:32] /*len*/, i_tdata[31:0] /*sid*/ };
CV2V_VRT_IFH : o_tdata_int <= { 4'h1 /*type*/, 1'b0, i_tdata[62] /*TRL*/, 1'b0, i_tdata[60] /*eob*/, 3'b00, i_tdata[61] /*time*/, i_tdata[51:48] /*seqnum*/, i_tdata[47:32] /*len*/, i_tdata[31:0] /*sid*/ };
CV2V_BODY : o_tdata_int <= (i_tlast & odd_len) ? { i_tdata[63:32], 32'h5645_4E44 /*VEND*/ } : i_tdata;
CV2V_VEND_EVEN : o_tdata_int <= { 32'h5645_4E44 /*VEND*/, 32'h0};
default : o_tdata_int <= i_tdata;
endcase // case (cv2v_state)
assign o_tlast_int = (cv2v_state == CV2V_VEND_EVEN) | ((cv2v_state == CV2V_BODY) & i_tlast & odd_len);
// Short FIFO before output
axi_fifo_short #(.WIDTH(81)) axi_fifo_short
(.clk(clk), .reset(reset), .clear(clear),
.i_tdata({o_tlast_int, i_tdata[15:0], o_tdata_int}), .i_tvalid(o_tvalid_int), .i_tready(o_tready_int),
.o_tdata({o_tlast, o_tuser, o_tdata}), .o_tvalid(o_tvalid), .o_tready(o_tready),
.space(), .occupied());
endmodule // compressed_vita_to_vrlp
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