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//////////////////////////////////////////////////////////////////////
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//////////////////////////////////////////////////////////////////////
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`include "spi_defines.v"
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`include "spi_defines.v"
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`include "timescale.v"
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`include "timescale.v"
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module spi_shift (clk, rst, latch, len, lsb, go,
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module spi_shift (clk, rst, latch, byte_sel, len, lsb, go,
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pos_edge, neg_edge, rx_negedge, tx_negedge,
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pos_edge, neg_edge, rx_negedge, tx_negedge,
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tip, last,
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tip, last,
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p_in, p_out, s_clk, s_in, s_out);
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p_in, p_out, s_clk, s_in, s_out);
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parameter Tp = 1;
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parameter Tp = 1;
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input clk; // system clock
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input clk; // system clock
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input rst; // reset
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input rst; // reset
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input [3:0] latch; // latch signal for storing the data in shift register
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input [3:0] latch; // latch signal for storing the data in shift register
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input [3:0] byte_sel; // byte select signals for storing the data in shift register
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input [`SPI_CHAR_LEN_BITS-1:0] len; // data len in bits (minus one)
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input [`SPI_CHAR_LEN_BITS-1:0] len; // data len in bits (minus one)
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input lsb; // lbs first on the line
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input lsb; // lbs first on the line
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input go; // start stansfer
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input go; // start stansfer
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input pos_edge; // recognize posedge of sclk
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input pos_edge; // recognize posedge of sclk
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input neg_edge; // recognize negedge of sclk
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input neg_edge; // recognize negedge of sclk
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begin
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begin
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if (rst)
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if (rst)
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data <= #Tp {`SPI_MAX_CHAR{1'b0}};
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data <= #Tp {`SPI_MAX_CHAR{1'b0}};
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`ifdef SPI_MAX_CHAR_128
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`ifdef SPI_MAX_CHAR_128
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else if (latch[0] && !tip)
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else if (latch[0] && !tip)
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data[31:0] <= #Tp p_in[31:0];
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begin
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if (byte_sel[0])
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data[31:24] <= #Tp p_in[31:24];
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if (byte_sel[1])
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data[23:16] <= #Tp p_in[23:16];
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if (byte_sel[2])
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data[15:8] <= #Tp p_in[15:8];
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if (byte_sel[3])
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data[7:0] <= #Tp p_in[7:0];
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end
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else if (latch[1] && !tip)
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else if (latch[1] && !tip)
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data[63:32] <= #Tp p_in[31:0];
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begin
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if (byte_sel[0])
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data[63:56] <= #Tp p_in[31:24];
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if (byte_sel[1])
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data[55:48] <= #Tp p_in[23:16];
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if (byte_sel[2])
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data[47:40] <= #Tp p_in[15:8];
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if (byte_sel[3])
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data[39:32] <= #Tp p_in[7:0];
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end
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else if (latch[2] && !tip)
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else if (latch[2] && !tip)
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data[95:64] <= #Tp p_in[31:0];
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begin
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if (byte_sel[0])
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data[95:88] <= #Tp p_in[31:24];
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if (byte_sel[1])
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data[87:80] <= #Tp p_in[23:16];
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if (byte_sel[2])
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data[79:72] <= #Tp p_in[15:8];
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if (byte_sel[3])
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data[71:64] <= #Tp p_in[7:0];
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end
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else if (latch[3] && !tip)
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else if (latch[3] && !tip)
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data[127:96] <= #Tp p_in[31:0];
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begin
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if (byte_sel[0])
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data[127:120] <= #Tp p_in[31:24];
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if (byte_sel[1])
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data[119:112] <= #Tp p_in[23:16];
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if (byte_sel[2])
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data[111:104] <= #Tp p_in[15:8];
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if (byte_sel[3])
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data[103:96] <= #Tp p_in[7:0];
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end
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`else
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`else
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`ifdef SPI_MAX_CHAR_64
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`ifdef SPI_MAX_CHAR_64
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else if (latch[0] && !tip)
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else if (latch[0] && !tip)
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data[31:0] <= #Tp p_in[31:0];
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begin
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if (byte_sel[0])
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data[31:24] <= #Tp p_in[31:24];
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if (byte_sel[1])
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data[23:16] <= #Tp p_in[23:16];
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if (byte_sel[2])
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data[15:8] <= #Tp p_in[15:8];
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if (byte_sel[3])
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data[7:0] <= #Tp p_in[7:0];
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end
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else if (latch[1] && !tip)
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else if (latch[1] && !tip)
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data[63:32] <= #Tp p_in[31:0];
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begin
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if (byte_sel[0])
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data[63:56] <= #Tp p_in[31:24];
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if (byte_sel[1])
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data[55:48] <= #Tp p_in[23:16];
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if (byte_sel[2])
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data[47:40] <= #Tp p_in[15:8];
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if (byte_sel[3])
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data[39:32] <= #Tp p_in[7:0];
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end
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`else
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`else
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else if (latch[0] && !tip)
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else if (latch[0] && !tip)
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data <= #Tp p_in[`SPI_MAX_CHAR-1:0];
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data <= #Tp p_in[`SPI_MAX_CHAR-1:0];
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begin
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`ifdef `SPI_MAX_CHAR_8
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if (byte_sel[3])
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data[`SPI_MAX_CHAR-1:0] <= #Tp p_in[`SPI_MAX_CHAR-1:0];
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`endif
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`ifdef `SPI_MAX_CHAR_16
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if (byte_sel[3])
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data[7:0] <= #Tp p_in[7:0];
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if (byte_sel[2])
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data[15:8] <= #Tp p_in[15:8];
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`endif
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`ifdef `SPI_MAX_CHAR_32
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if (byte_sel[3])
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data[7:0] <= #Tp p_in[7:0];
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if (byte_sel[2])
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data[15:8] <= #Tp p_in[15:8];
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if (byte_sel[1])
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data[23:16] <= #Tp p_in[23:16];
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if (byte_sel[0])
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data[31:24] <= #Tp p_in[31:24];
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end
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`endif
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`endif
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`endif
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`endif
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`endif
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else
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else
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data[rx_bit_pos[`SPI_CHAR_LEN_BITS-1:0]] <= #Tp rx_clk ? s_in : data[rx_bit_pos[`SPI_CHAR_LEN_BITS-1:0]];
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data[rx_bit_pos[`SPI_CHAR_LEN_BITS-1:0]] <= #Tp rx_clk ? s_in : data[rx_bit_pos[`SPI_CHAR_LEN_BITS-1:0]];
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end
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end
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