module ltc2195_rx (
input rst, // Reset input.
input dco, // Clock input.
input fr, // Frame sync signal.
input [ 3:0] rxd, // Serial data.
output reg [15:0] data, // Parallel data.
output reg done // Data recieved flag.
);
reg [1:0][3:0] data_p; // Positive edge data.
reg [1:0][3:0] data_n; // Negative edge data.
always_ff @(negedge dco, posedge rst)
if (rst)
data_n[1:0] <= '0;
else
data_n[1:0] <= {data_n[0], rxd}; // Recieve data at negative edge.
always_ff @(posedge dco, posedge rst)
if (rst)
begin
data_p <= '0;
data <= '0;
done <= '0;
end
else
begin
data_p[1:0] <= {data_p[0], rxd}; // Recieve data at positive edge.
if (fr) // Store data to output register.
{data[15], data[14], data[ 7], data[ 6],
data[13], data[12], data[ 5], data[ 4],
data[11], data[10], data[ 3], data[ 2],
data[ 9], data[ 8], data[ 1], data[ 0]
} <= {data_p[1], data_n[1], data_p[0], data_n[0]};
done <= fr; // Set recieved flag.
end
endmodule
И читать данные из выходного регистра по сигналу done.
