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module vita_tx_control
#(parameter BASE=0,
parameter WIDTH=32)
(input clk, input reset, input clear,
input set_stb, input [7:0] set_addr, input [31:0] set_data,
input [63:0] vita_time,
output underrun,
// From vita_tx_deframer
input [4+64+WIDTH-1:0] sample_fifo_i,
input sample_fifo_src_rdy_i,
output sample_fifo_dst_rdy_o,
// To DSP Core
output [WIDTH-1:0] sample,
output run,
input strobe,
output [31:0] debug
);
assign sample = sample_fifo_i[4+64+WIDTH-1:4+64];
wire [63:0] send_time = sample_fifo_i[63:0];
wire eop = sample_fifo_i[64];
wire eob = sample_fifo_i[65];
wire sob = sample_fifo_i[66];
wire send_at = sample_fifo_i[67];
wire now, early, late, too_early;
// FIXME ignore too_early for now for timing reasons
assign too_early = 0;
time_compare
time_compare (.time_now(vita_time), .trigger_time(send_time), .now(now), .early(early),
.late(late), .too_early());
// .late(late), .too_early(too_early));
localparam IBS_IDLE = 0;
localparam IBS_RUN = 1; // FIXME do we need this?
localparam IBS_CONT_BURST = 2;
localparam IBS_UNDERRUN = 3;
localparam IBS_UNDERRUN_DONE = 4;
reg [2:0] ibs_state;
wire clear_state;
setting_reg #(.my_addr(BASE+1)) sr
(.clk(clk),.rst(rst),.strobe(set_stb),.addr(set_addr),
.in(set_data),.out(),.changed(clear_state));
always @(posedge clk)
if(reset | clear_state)
ibs_state <= 0;
else
case(ibs_state)
IBS_IDLE :
if(sample_fifo_src_rdy_i)
if(~send_at | now)
ibs_state <= IBS_RUN;
else if(late | too_early)
ibs_state <= IBS_UNDERRUN;
IBS_RUN :
if(strobe)
if(~sample_fifo_src_rdy_i)
ibs_state <= IBS_UNDERRUN;
else if(eop)
if(eob)
ibs_state <= IBS_IDLE;
else
ibs_state <= IBS_CONT_BURST;
IBS_CONT_BURST :
if(strobe)
ibs_state <= IBS_UNDERRUN_DONE;
else if(sample_fifo_src_rdy_i)
ibs_state <= IBS_RUN;
IBS_UNDERRUN :
if(sample_fifo_src_rdy_i & eop)
ibs_state <= IBS_UNDERRUN_DONE;
IBS_UNDERRUN_DONE :
;
endcase // case (ibs_state)
assign sample_fifo_dst_rdy_o = (ibs_state == IBS_UNDERRUN) | (strobe & (ibs_state == IBS_RUN)); // FIXME also cleanout
assign run = (ibs_state == IBS_RUN) | (ibs_state == IBS_CONT_BURST);
assign underrun = (ibs_state == IBS_UNDERRUN_DONE);
assign debug = { { now,early,late,too_early,eop,eob,sob,send_at },
{ sample_fifo_src_rdy_i, sample_fifo_dst_rdy_o, strobe, run, underrun, ibs_state[2:0] },
{ 8'b0 },
{ 8'b0 } };
endmodule // vita_tx_control
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