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[/] [usbhostslave/] [trunk/] [RTL/] [hostController/] [getpacket.v] - Rev 2
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//-------------------------------------------------------------------------------------------------- // // Title : No Title // Design : usbhostslave // Author : Steve // Company : Base2Designs // //------------------------------------------------------------------------------------------------- // // File : c:\projects\USBHostSlave\Aldec\usbhostslave\usbhostslave\compile\getpacket.v // Generated : 09/22/04 06:01:21 // From : c:\projects\USBHostSlave\RTL\hostController\getpacket.asf // By : FSM2VHDL ver. 4.0.5.2 // //------------------------------------------------------------------------------------------------- // // Description : // //------------------------------------------------------------------------------------------------- `include "usbSerialInterfaceEngine_h.v" `include "usbConstants_h.v" module getPacket (RXDataIn, RXDataValid, RXFifoData, RXFifoFull, RXFifoWEn, RXPacketRdy, RXPktStatus, RXStreamStatusIn, RxPID, SIERxTimeOut, clk, getPacketEn, rst); input [7:0] RXDataIn; input RXDataValid; input RXFifoFull; input [7:0] RXStreamStatusIn; input SIERxTimeOut; // Single cycle pulse input clk; input getPacketEn; input rst; output [7:0] RXFifoData; output RXFifoWEn; output RXPacketRdy; output [7:0] RXPktStatus; output [3:0] RxPID; wire [7:0] RXDataIn; wire RXDataValid; reg [7:0] RXFifoData, next_RXFifoData; wire RXFifoFull; reg RXFifoWEn, next_RXFifoWEn; reg RXPacketRdy, next_RXPacketRdy; reg [7:0] RXPktStatus; wire [7:0] RXStreamStatusIn; reg [3:0] RxPID, next_RxPID; wire SIERxTimeOut; wire clk; wire getPacketEn; wire rst; // diagram signals declarations reg ACKRxed, next_ACKRxed; reg CRCError, next_CRCError; reg NAKRxed, next_NAKRxed; reg [7:0]RXByteOld, next_RXByteOld; reg [7:0]RXByteOldest, next_RXByteOldest; reg [7:0]RXByte, next_RXByte; reg RXOverflow, next_RXOverflow; reg [7:0]RXStreamStatus, next_RXStreamStatus; reg RXTimeOut, next_RXTimeOut; reg bitStuffError, next_bitStuffError; reg dataSequence, next_dataSequence; reg stallRxed, next_stallRxed; // BINARY ENCODED state machine: getPkt // State codes definitions: `define PROC_PKT_CHK_PID 5'b00000 `define PROC_PKT_HS 5'b00001 `define PROC_PKT_DATA_W_D1 5'b00010 `define PROC_PKT_DATA_CHK_D1 5'b00011 `define PROC_PKT_DATA_W_D2 5'b00100 `define PROC_PKT_DATA_FIN 5'b00101 `define PROC_PKT_DATA_CHK_D2 5'b00110 `define PROC_PKT_DATA_W_D3 5'b00111 `define PROC_PKT_DATA_CHK_D3 5'b01000 `define PROC_PKT_DATA_LOOP_CHK_FIFO 5'b01001 `define PROC_PKT_DATA_LOOP_FIFO_FULL 5'b01010 `define PROC_PKT_DATA_LOOP_W_D 5'b01011 `define START_GP 5'b01100 `define WAIT_PKT 5'b01101 `define CHK_PKT_START 5'b01110 `define WAIT_EN 5'b01111 `define PKT_RDY 5'b10000 `define PROC_PKT_DATA_LOOP_DELAY 5'b10001 reg [4:0] CurrState_getPkt; reg [4:0] NextState_getPkt; // Diagram actions (continuous assignments allowed only: assign ...) always @ (CRCError or bitStuffError or RXOverflow or RXTimeOut or NAKRxed or stallRxed or ACKRxed or dataSequence) begin RXPktStatus = { dataSequence, ACKRxed, stallRxed, NAKRxed, RXTimeOut, RXOverflow, bitStuffError, CRCError}; end //-------------------------------------------------------------------- // Machine: getPkt //-------------------------------------------------------------------- //---------------------------------- // NextState logic (combinatorial) //---------------------------------- always @ (RXDataIn or RXStreamStatusIn or RXByte or RXByteOldest or RXByteOld or SIERxTimeOut or RXDataValid or RXStreamStatus or getPacketEn or RXFifoFull or CRCError or bitStuffError or RXOverflow or RXTimeOut or NAKRxed or stallRxed or ACKRxed or dataSequence or RxPID or RXPacketRdy or RXFifoWEn or RXFifoData or CurrState_getPkt) begin : getPkt_NextState NextState_getPkt <= CurrState_getPkt; // Set default values for outputs and signals next_CRCError <= CRCError; next_bitStuffError <= bitStuffError; next_RXOverflow <= RXOverflow; next_RXTimeOut <= RXTimeOut; next_NAKRxed <= NAKRxed; next_stallRxed <= stallRxed; next_ACKRxed <= ACKRxed; next_dataSequence <= dataSequence; next_RXByte <= RXByte; next_RXStreamStatus <= RXStreamStatus; next_RxPID <= RxPID; next_RXPacketRdy <= RXPacketRdy; next_RXByteOldest <= RXByteOldest; next_RXByteOld <= RXByteOld; next_RXFifoWEn <= RXFifoWEn; next_RXFifoData <= RXFifoData; case (CurrState_getPkt) // synopsys parallel_case full_case `START_GP: NextState_getPkt <= `WAIT_EN; `WAIT_PKT: begin next_CRCError <= 1'b0; next_bitStuffError <= 1'b0; next_RXOverflow <= 1'b0; next_RXTimeOut <= 1'b0; next_NAKRxed <= 1'b0; next_stallRxed <= 1'b0; next_ACKRxed <= 1'b0; next_dataSequence <= 1'b0; if (SIERxTimeOut == 1'b1) begin NextState_getPkt <= `PKT_RDY; next_RXTimeOut <= 1'b1; end else if (RXDataValid == 1'b1) begin NextState_getPkt <= `CHK_PKT_START; next_RXByte <= RXDataIn; next_RXStreamStatus <= RXStreamStatusIn; end end `CHK_PKT_START: if (RXStreamStatus == `RX_PACKET_START) begin NextState_getPkt <= `PROC_PKT_CHK_PID; next_RxPID <= RXByte[3:0]; end else begin NextState_getPkt <= `PKT_RDY; next_RXTimeOut <= 1'b1; end `WAIT_EN: begin next_RXPacketRdy <= 1'b0; if (getPacketEn == 1'b1) NextState_getPkt <= `WAIT_PKT; end `PKT_RDY: begin next_RXPacketRdy <= 1'b1; NextState_getPkt <= `WAIT_EN; end `PROC_PKT_CHK_PID: if (RXByte[1:0] == `HANDSHAKE) NextState_getPkt <= `PROC_PKT_HS; else if (RXByte[1:0] == `DATA) NextState_getPkt <= `PROC_PKT_DATA_W_D1; else NextState_getPkt <= `PKT_RDY; `PROC_PKT_HS: if (RXDataValid == 1'b1) begin NextState_getPkt <= `PKT_RDY; next_RXOverflow <= RXDataIn[`RX_OVERFLOW_BIT]; next_NAKRxed <= RXDataIn[`NAK_RXED_BIT]; next_stallRxed <= RXDataIn[`STALL_RXED_BIT]; next_ACKRxed <= RXDataIn[`ACK_RXED_BIT]; end `PROC_PKT_DATA_W_D1: if (RXDataValid == 1'b1) begin NextState_getPkt <= `PROC_PKT_DATA_CHK_D1; next_RXByte <= RXDataIn; next_RXStreamStatus <= RXStreamStatusIn; end `PROC_PKT_DATA_CHK_D1: if (RXStreamStatus == `RX_PACKET_STREAM) begin NextState_getPkt <= `PROC_PKT_DATA_W_D2; next_RXByteOldest <= RXByte; end else NextState_getPkt <= `PROC_PKT_DATA_FIN; `PROC_PKT_DATA_W_D2: if (RXDataValid == 1'b1) begin NextState_getPkt <= `PROC_PKT_DATA_CHK_D2; next_RXByte <= RXDataIn; next_RXStreamStatus <= RXStreamStatusIn; end `PROC_PKT_DATA_FIN: begin next_CRCError <= RXByte[`CRC_ERROR_BIT]; next_bitStuffError <= RXByte[`BIT_STUFF_ERROR_BIT]; next_dataSequence <= RXByte[`DATA_SEQUENCE_BIT]; NextState_getPkt <= `PKT_RDY; end `PROC_PKT_DATA_CHK_D2: if (RXStreamStatus == `RX_PACKET_STREAM) begin NextState_getPkt <= `PROC_PKT_DATA_W_D3; next_RXByteOld <= RXByte; end else NextState_getPkt <= `PROC_PKT_DATA_FIN; `PROC_PKT_DATA_W_D3: if (RXDataValid == 1'b1) begin NextState_getPkt <= `PROC_PKT_DATA_CHK_D3; next_RXByte <= RXDataIn; next_RXStreamStatus <= RXStreamStatusIn; end `PROC_PKT_DATA_CHK_D3: if (RXStreamStatus == `RX_PACKET_STREAM) NextState_getPkt <= `PROC_PKT_DATA_LOOP_CHK_FIFO; else NextState_getPkt <= `PROC_PKT_DATA_FIN; `PROC_PKT_DATA_LOOP_CHK_FIFO: if (RXFifoFull == 1'b1) begin NextState_getPkt <= `PROC_PKT_DATA_LOOP_FIFO_FULL; next_RXOverflow <= 1'b1; end else begin NextState_getPkt <= `PROC_PKT_DATA_LOOP_W_D; next_RXFifoWEn <= 1'b1; next_RXFifoData <= RXByteOldest; next_RXByteOldest <= RXByteOld; next_RXByteOld <= RXByte; end `PROC_PKT_DATA_LOOP_FIFO_FULL: NextState_getPkt <= `PROC_PKT_DATA_LOOP_W_D; `PROC_PKT_DATA_LOOP_W_D: begin next_RXFifoWEn <= 1'b0; if ((RXDataValid == 1'b1) && (RXStreamStatusIn == `RX_PACKET_STREAM)) begin NextState_getPkt <= `PROC_PKT_DATA_LOOP_DELAY; next_RXByte <= RXDataIn; next_RXStreamStatus <= RXStreamStatusIn; end else if (RXDataValid == 1'b1) begin NextState_getPkt <= `PROC_PKT_DATA_FIN; next_RXByte <= RXDataIn; next_RXStreamStatus <= RXStreamStatusIn; end end `PROC_PKT_DATA_LOOP_DELAY: NextState_getPkt <= `PROC_PKT_DATA_LOOP_CHK_FIFO; endcase end //---------------------------------- // Current State Logic (sequential) //---------------------------------- always @ (posedge clk) begin : getPkt_CurrentState if (rst) CurrState_getPkt <= `START_GP; else CurrState_getPkt <= NextState_getPkt; end //---------------------------------- // Registered outputs logic //---------------------------------- always @ (posedge clk) begin : getPkt_RegOutput if (rst) begin RXByteOld <= 8'h00; RXByteOldest <= 8'h00; CRCError <= 1'b0; bitStuffError <= 1'b0; RXOverflow <= 1'b0; RXTimeOut <= 1'b0; NAKRxed <= 1'b0; stallRxed <= 1'b0; ACKRxed <= 1'b0; dataSequence <= 1'b0; RXByte <= 8'h00; RXStreamStatus <= 8'h00; RXPacketRdy <= 1'b0; RXFifoWEn <= 1'b0; RXFifoData <= 8'h00; RxPID <= 4'h0; end else begin RXByteOld <= next_RXByteOld; RXByteOldest <= next_RXByteOldest; CRCError <= next_CRCError; bitStuffError <= next_bitStuffError; RXOverflow <= next_RXOverflow; RXTimeOut <= next_RXTimeOut; NAKRxed <= next_NAKRxed; stallRxed <= next_stallRxed; ACKRxed <= next_ACKRxed; dataSequence <= next_dataSequence; RXByte <= next_RXByte; RXStreamStatus <= next_RXStreamStatus; RXPacketRdy <= next_RXPacketRdy; RXFifoWEn <= next_RXFifoWEn; RXFifoData <= next_RXFifoData; RxPID <= next_RxPID; end end endmodule
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