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module rxmac_to_ll8
(input clk, input reset, input clear,
input [7:0] rx_data, input rx_valid, input rx_error, input rx_ack,
output [7:0] ll_data, output ll_sof, output ll_eof, output ll_src_rdy, input ll_dst_rdy );
assign ll_data = rx_data;
assign ll_src_rdy = rx_valid;
assign ll_sof = ((xfer_state==XFER_IDLE)|(xfer_state==XFER_ERROR)|(xfer_state==XFER_OVERRUN));
assign ll_eof = (rx_ack | (xfer_state==XFER_ERROR) | (xfer_state==XFER_OVERRUN));
reg [1:0] xfer_state;
localparam XFER_IDLE = 0;
localparam XFER_ACTIVE = 1;
localparam XFER_ERROR = 2;
localparam XFER_OVERRUN = 3;
always @(posedge clk)
if(reset | clear)
xfer_state <= XFER_IDLE;
else
case(xfer_state)
XFER_IDLE :
if(rx_valid)
xfer_state <= XFER_ACTIVE;
XFER_ACTIVE :
if(rx_error)
xfer_state <= XFER_ERROR;
else if(~rx_valid)
xfer_state <= XFER_IDLE;
else if(~ll_dst_rdy)
xfer_state <= XFER_OVERRUN;
XFER_ERROR :
if(~rx_valid)
xfer_state <= XFER_IDLE;
XFER_OVERRUN :
if(ll_dst_rdy & ~rx_valid)
xfer_state <= XFER_IDLE;
endcase // case (xfer_state)
endmodule // rxmac_to_ll8
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