| Line 25... |
Line 25... |
wire [7:0] ip_data;
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wire [7:0] ip_data;
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reg [3:0] count, nxt_count;
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reg [3:0] count, nxt_count;
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reg [7:0] nxt_gmii_txd;
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reg [7:0] nxt_gmii_txd;
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reg nxt_gmii_tx_en;
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reg nxt_gmii_tx_en;
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reg [3:0] state, nxt_state;
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reg [5:0] state, nxt_state;
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localparam s_idle = 0, s_preamble = 1, s_payload = 2, s_ipg = 3;
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wire [31:0] crc;
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reg clear;
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reg crc_valid;
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localparam s_idle = 0, s_preamble = 1, s_payload = 2, s_ipg = 3, s_badcrc = 4, s_goodcrc = 5;
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localparam ns_idle = 1, ns_preamble = 2, ns_payload = 4, ns_ipg = 8;
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localparam ns_idle = 1, ns_preamble = 2, ns_payload = 4, ns_ipg = 8;
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sd_input #(8+2) in_hold
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sd_input #(8+2) in_hold
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(
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(
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// Outputs
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// Outputs
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| Line 43... |
Line 47... |
.reset (reset),
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.reset (reset),
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.c_srdy (txg_srdy),
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.c_srdy (txg_srdy),
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.c_data ({txg_code,txg_data}),
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.c_data ({txg_code,txg_data}),
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.ip_drdy (ip_drdy));
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.ip_drdy (ip_drdy));
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mac_crc32 crcgen
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(
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.data (ip_data[7:0]),
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.valid (crc_valid),
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/*AUTOINST*/
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// Outputs
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.crc (crc[31:0]),
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// Inputs
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.clk (clk),
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.clear (clear));
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always @*
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always @*
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begin
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begin
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ip_drdy = 0;
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ip_drdy = 0;
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nxt_count = count;
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nxt_count = count;
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nxt_gmii_tx_en = 0;
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nxt_gmii_tx_en = 0;
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nxt_gmii_txd = gmii_txd;
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nxt_gmii_txd = gmii_txd;
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clear = 0;
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crc_valid = 0;
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case (1'b1)
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case (1'b1)
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state[s_idle] :
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state[s_idle] :
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begin
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begin
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if (ip_srdy & (ip_code == `PCC_SOP))
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if (ip_srdy & (ip_code == `PCC_SOP))
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begin
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begin
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nxt_gmii_tx_en = 1;
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nxt_gmii_tx_en = 1;
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nxt_gmii_txd = `GMII_PRE;
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nxt_gmii_txd = `GMII_PRE;
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nxt_count = 1;
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nxt_count = 1;
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nxt_state = ns_preamble;
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nxt_state = ns_preamble;
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clear = 1;
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end
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end
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else
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else
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begin
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begin
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ip_drdy = 1;
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ip_drdy = 1;
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end // else: !if(ip_srdy & (ip_code == `PCC_SOP))
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end // else: !if(ip_srdy & (ip_code == `PCC_SOP))
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| Line 84... |
Line 102... |
state[s_payload] :
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state[s_payload] :
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begin
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begin
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ip_drdy = 1;
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ip_drdy = 1;
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nxt_gmii_tx_en = 1;
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nxt_gmii_tx_en = 1;
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nxt_gmii_txd = ip_data;
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nxt_gmii_txd = ip_data;
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crc_valid = 1;
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if (!ip_srdy | ((ip_code == `PCC_EOP) | (ip_code == `PCC_BADEOP)))
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if (!ip_srdy | ((ip_code == `PCC_EOP) | (ip_code == `PCC_BADEOP)))
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begin
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begin
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nxt_count = 0;
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nxt_count = 0;
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nxt_state = ns_ipg;
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if (ip_code == `PCC_EOP)
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nxt_state = 1 << s_goodcrc;
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else
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nxt_state = 1 << s_badcrc;
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end
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end
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end // case: state[s_payload]
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end // case: state[s_payload]
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state[s_goodcrc] :
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begin
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nxt_count = count + 1;
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nxt_gmii_tx_en = 1;
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case (count)
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0 : nxt_gmii_txd = crc[7:0];
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1 : nxt_gmii_txd = crc[15:8];
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2 : nxt_gmii_txd = crc[23:16];
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3 : nxt_gmii_txd = crc[31:24];
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endcase // case (count)
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if (count == 3)
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begin
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nxt_state = 1 << s_ipg;
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end
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end
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state[s_badcrc] :
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begin
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nxt_count = count + 1;
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nxt_gmii_tx_en = 1;
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nxt_gmii_txd = 8'h0;
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if (count == 3)
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begin
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nxt_state = 1 << s_ipg;
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end
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end
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state[s_ipg] :
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state[s_ipg] :
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begin
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begin
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nxt_gmii_tx_en = 0;
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nxt_gmii_tx_en = 0;
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ip_drdy = 0;
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ip_drdy = 0;
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nxt_count = count + 1;
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nxt_count = count + 1;
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