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444 lines
20 KiB
Verilog
444 lines
20 KiB
Verilog
// ----------------------------------------------------------------------
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// Copyright (c) 2016, The Regents of the University of California All
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// rights reserved.
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//
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// Redistribution and use in source and binary forms, with or without
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// modification, are permitted provided that the following conditions are
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// met:
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//
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// * Redistributions of source code must retain the above copyright
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// notice, this list of conditions and the following disclaimer.
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//
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// * Redistributions in binary form must reproduce the above
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// copyright notice, this list of conditions and the following
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// disclaimer in the documentation and/or other materials provided
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// with the distribution.
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//
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// * Neither the name of The Regents of the University of California
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// nor the names of its contributors may be used to endorse or
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// promote products derived from this software without specific
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// prior written permission.
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//
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// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
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// "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
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// LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
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// A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL REGENTS OF THE
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// UNIVERSITY OF CALIFORNIA BE LIABLE FOR ANY DIRECT, INDIRECT,
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// INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
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// BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS
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// OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
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// ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR
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// TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE
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// USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH
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// DAMAGE.
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// ----------------------------------------------------------------------
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//----------------------------------------------------------------------------
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// Filename: rxc_engine_classic.v
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// Version: 1.0
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// Verilog Standard: Verilog-2001
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// Description: The RXC Engine (Classic) takes a single stream of TLP
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// packets and provides the completion packets on the RXC Interface.
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// This Engine is capable of operating at "line rate".
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// Author: Dustin Richmond (@darichmond)
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//-----------------------------------------------------------------------------
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`timescale 1ns/1ns
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`include "trellis.vh"
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`include "tlp.vh"
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module rxc_engine_classic
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#(parameter C_VENDOR = "ALTERA",
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parameter C_PCI_DATA_WIDTH = 128,
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parameter C_RX_PIPELINE_DEPTH = 10)
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(// Interface: Clocks
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input CLK,
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// Interface: Resets
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input RST_BUS, // Replacement for generic RST_IN
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input RST_LOGIC, // Addition for RIFFA_RST
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output DONE_RXC_RST,
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// Interface: RX Classic
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input [C_PCI_DATA_WIDTH-1:0] RX_TLP,
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input RX_TLP_VALID,
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input RX_TLP_START_FLAG,
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input [`SIG_OFFSET_W-1:0] RX_TLP_START_OFFSET,
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input RX_TLP_END_FLAG,
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input [`SIG_OFFSET_W-1:0] RX_TLP_END_OFFSET,
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input [`SIG_BARDECODE_W-1:0] RX_TLP_BAR_DECODE,
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// Interface: RXC Engine
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output [C_PCI_DATA_WIDTH-1:0] RXC_DATA,
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output RXC_DATA_VALID,
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output [(C_PCI_DATA_WIDTH/32)-1:0] RXC_DATA_WORD_ENABLE,
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output RXC_DATA_START_FLAG,
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output [clog2s(C_PCI_DATA_WIDTH/32)-1:0] RXC_DATA_START_OFFSET,
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output RXC_DATA_END_FLAG,
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output [clog2s(C_PCI_DATA_WIDTH/32)-1:0] RXC_DATA_END_OFFSET,
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output [`SIG_LBE_W-1:0] RXC_META_LDWBE,
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output [`SIG_FBE_W-1:0] RXC_META_FDWBE,
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output [`SIG_TAG_W-1:0] RXC_META_TAG,
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output [`SIG_LOWADDR_W-1:0] RXC_META_ADDR,
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output [`SIG_TYPE_W-1:0] RXC_META_TYPE,
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output [`SIG_LEN_W-1:0] RXC_META_LENGTH,
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output [`SIG_BYTECNT_W-1:0] RXC_META_BYTES_REMAINING,
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output [`SIG_CPLID_W-1:0] RXC_META_COMPLETER_ID,
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output RXC_META_EP,
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// Interface: RX Shift Register
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input [(C_RX_PIPELINE_DEPTH+1)*C_PCI_DATA_WIDTH-1:0] RX_SR_DATA,
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input [C_RX_PIPELINE_DEPTH:0] RX_SR_EOP,
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input [(C_RX_PIPELINE_DEPTH+1)*`SIG_OFFSET_W-1:0] RX_SR_END_OFFSET,
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input [C_RX_PIPELINE_DEPTH:0] RX_SR_SOP,
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input [C_RX_PIPELINE_DEPTH:0] RX_SR_VALID);
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/*AUTOWIRE*/
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/*AUTOINPUT*/
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///*AUTOOUTPUT*/
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// End of automatics
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localparam C_RX_BE_W = (`SIG_FBE_W+`SIG_LBE_W);
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localparam C_RX_INPUT_STAGES = 1;
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localparam C_RX_OUTPUT_STAGES = 1; // Must always be at least one
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localparam C_RX_COMPUTATION_STAGES = 1;
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localparam C_RX_DATA_STAGES = C_RX_COMPUTATION_STAGES;
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localparam C_RX_META_STAGES = C_RX_DATA_STAGES - 1;
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localparam C_TOTAL_STAGES = C_RX_COMPUTATION_STAGES + C_RX_OUTPUT_STAGES + C_RX_INPUT_STAGES;
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// Cycle index in the SOP register when enable is raised
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// Computation can begin when the last DW of the header is recieved.
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localparam C_RX_COMPUTATION_CYCLE = C_RX_COMPUTATION_STAGES + (`TLP_CPLMETADW2_I/C_PCI_DATA_WIDTH);
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// The computation cycle must be at least one cycle before the address is enabled
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localparam C_RX_DATA_CYCLE = C_RX_COMPUTATION_CYCLE;
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localparam C_RX_METADW0_CYCLE = (`TLP_CPLMETADW0_I/C_PCI_DATA_WIDTH) + C_RX_INPUT_STAGES;
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localparam C_RX_METADW1_CYCLE = (`TLP_CPLMETADW1_I/C_PCI_DATA_WIDTH) + C_RX_INPUT_STAGES;
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localparam C_RX_METADW2_CYCLE = (`TLP_CPLMETADW2_I/C_PCI_DATA_WIDTH) + C_RX_INPUT_STAGES;
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localparam C_RX_METADW0_INDEX = C_PCI_DATA_WIDTH*C_RX_INPUT_STAGES + (`TLP_CPLMETADW0_I%C_PCI_DATA_WIDTH);
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localparam C_RX_METADW1_INDEX = C_PCI_DATA_WIDTH*C_RX_INPUT_STAGES + (`TLP_CPLMETADW1_I%C_PCI_DATA_WIDTH);
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localparam C_RX_METADW2_INDEX = C_PCI_DATA_WIDTH*C_RX_INPUT_STAGES + (`TLP_CPLMETADW2_I%C_PCI_DATA_WIDTH);
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localparam C_OFFSET_WIDTH = clog2s(C_PCI_DATA_WIDTH/32);
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localparam C_MAX_ABLANK_WIDTH = 32;
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localparam C_MAX_START_OFFSET = (`TLP_MAXHDR_W + C_MAX_ABLANK_WIDTH)/32;
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localparam C_STD_START_DELAY = (64/C_PCI_DATA_WIDTH);
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wire [`TLP_CPLADDR_W-1:0] wAddr;
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wire [`TLP_CPLHDR_W-1:0] wMetadata;
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wire [`TLP_TYPE_W-1:0] wType;
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wire [`TLP_LEN_W-1:0] wLength;
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wire [2:0] wHdrLength;
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wire [2:0] wHdrLengthM1;
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wire [(C_PCI_DATA_WIDTH/32)-1:0] wEndMask;
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wire wEndFlag;
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wire [clog2s(C_PCI_DATA_WIDTH/32)-1:0] wEndOffset;
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wire [(C_PCI_DATA_WIDTH/32)-1:0] wStartMask;
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wire wStartFlag;
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wire _wStartFlag;
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wire [2:0] wStartOffset;
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wire [3:0] wStartFlags;
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wire wInsertBlank;
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wire [C_PCI_DATA_WIDTH-1:0] wRxcData;
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wire [95:0] wRxcMetadata;
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wire wRxcDataValid;
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wire wRxcDataEndFlag;
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wire [clog2s(C_PCI_DATA_WIDTH/32)-1:0] wRxcDataEndOffset;
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wire wRxcDataStartFlag;
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wire [clog2s(C_PCI_DATA_WIDTH/32)-1:0] wRxcDataStartOffset;
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wire [(C_PCI_DATA_WIDTH/32)-1:0] wRxcDataWordEnable;
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wire [C_RX_PIPELINE_DEPTH:0] wRxSrSop;
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reg rValid,_rValid;
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reg rRST;
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assign DONE_RXC_RST = ~rRST;
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// Calculate the header length (start offset), and header length minus 1 (end offset)
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assign wHdrLength = 3'b011;
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assign wHdrLengthM1 = 3'b010;
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// Determine if the TLP has an inserted blank before the payload
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assign wInsertBlank = ~wAddr[2] & (C_VENDOR == "ALTERA");
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assign wStartOffset = (wHdrLength + {2'd0,wInsertBlank}); // Start offset in dwords
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assign wEndOffset = wHdrLengthM1 + wInsertBlank + wLength; //RX_SR_END_OFFSET[(C_TOTAL_STAGES-1)*`SIG_OFFSET_W +: C_OFFSET_WIDTH];
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// Outputs
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assign RXC_DATA = RX_SR_DATA[(C_TOTAL_STAGES)*C_PCI_DATA_WIDTH +: C_PCI_DATA_WIDTH];
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assign RXC_DATA_VALID = wRxcDataValid;
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assign RXC_DATA_END_FLAG = wRxcDataEndFlag;
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assign RXC_DATA_END_OFFSET = wRxcDataEndOffset;
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assign RXC_DATA_START_FLAG = wRxcDataStartFlag;
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assign RXC_DATA_START_OFFSET = wRxcDataStartOffset;
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assign RXC_META_LENGTH = wRxcMetadata[`TLP_LEN_R];
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//assign RXC_META_TC = wRxcMetadata[`TLP_TC_R];
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//assign RXC_META_ATTR = {wRxcMetadata[`TLP_ATTR1_R], wRxcMetadata[`TLP_ATTR0_R]};
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assign RXC_META_TYPE = tlp_to_trellis_type({wRxcMetadata[`TLP_FMT_R],wRxcMetadata[`TLP_TYPE_R]});
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assign RXC_META_ADDR = wRxcMetadata[`TLP_CPLADDR_R];
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assign RXC_META_COMPLETER_ID = wRxcMetadata[`TLP_CPLCPLID_R];
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assign RXC_META_BYTES_REMAINING = wRxcMetadata[`TLP_CPLBYTECNT_R];
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assign RXC_META_TAG = wRxcMetadata[`TLP_CPLTAG_R];
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assign RXC_META_EP = wRxcMetadata[`TLP_EP_R];
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assign RXC_META_FDWBE = 0;// TODO: Remove (use addr)
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assign RXC_META_LDWBE = 0;// TODO: Remove (use addr)
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assign wEndFlag = RX_SR_EOP[C_RX_INPUT_STAGES+1];
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assign _wStartFlag = wStartFlags != 0;
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generate
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if(C_PCI_DATA_WIDTH == 32) begin
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assign wStartFlags[3] = 0;
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assign wStartFlags[2] = wRxSrSop[C_RX_INPUT_STAGES + 3] & wMetadata[`TLP_PAYBIT_I] & ~rValid; // Any remaining cases
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assign wStartFlags[1] = wRxSrSop[C_RX_INPUT_STAGES + 2] & wMetadata[`TLP_PAYBIT_I] & ~wMetadata[`TLP_4DWHBIT_I]; // 3DWH, No Blank
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assign wStartFlags[0] = wRxSrSop[C_RX_INPUT_STAGES + 2] & ~wMetadata[`TLP_PAYBIT_I]; // No Payload
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end else if(C_PCI_DATA_WIDTH == 64) begin
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assign wStartFlags[3] = 0;
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assign wStartFlags[2] = wRxSrSop[C_RX_INPUT_STAGES + 2] & wMetadata[`TLP_PAYBIT_I] & ~rValid; // Any remaining cases
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if(C_VENDOR == "ALTERA") begin
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assign wStartFlags[1] = wRxSrSop[C_RX_INPUT_STAGES + 1] & wMetadata[`TLP_PAYBIT_I] & ~wMetadata[`TLP_4DWHBIT_I] & RX_SR_DATA[C_RX_METADW2_INDEX + 2]; // 3DWH, No Blank
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end else begin
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assign wStartFlags[1] = wRxSrSop[C_RX_INPUT_STAGES + 1] & wMetadata[`TLP_PAYBIT_I] & ~wMetadata[`TLP_4DWHBIT_I]; // 3DWH, No Blank
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end
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assign wStartFlags[0] = wRxSrSop[C_RX_INPUT_STAGES + 1] & ~wMetadata[`TLP_PAYBIT_I] & rValid; // No Payload
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end else if (C_PCI_DATA_WIDTH == 128) begin
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assign wStartFlags[3] = 0;
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assign wStartFlags[2] = wRxSrSop[C_RX_INPUT_STAGES + 1] & wMetadata[`TLP_PAYBIT_I] & ~rValid; // Is this correct?
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if(C_VENDOR == "ALTERA") begin
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assign wStartFlags[1] = wRxSrSop[C_RX_INPUT_STAGES] & RX_SR_DATA[C_RX_METADW0_INDEX + `TLP_PAYBIT_I] & ~RX_SR_DATA[C_RX_METADW0_INDEX + `TLP_4DWHBIT_I] & RX_SR_DATA[C_RX_METADW2_INDEX + 2]; // 3DWH, No Blank
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end else begin
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assign wStartFlags[1] = wRxSrSop[C_RX_INPUT_STAGES] & RX_SR_DATA[C_RX_METADW0_INDEX + `TLP_PAYBIT_I] & ~RX_SR_DATA[C_RX_METADW0_INDEX + `TLP_4DWHBIT_I];
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end
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assign wStartFlags[0] = wRxSrSop[C_RX_INPUT_STAGES] & ~RX_SR_DATA[C_RX_METADW0_INDEX + `TLP_PAYBIT_I]; // No Payload
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end else begin // 256
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assign wStartFlags[3] = 0;
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assign wStartFlags[2] = 0;
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assign wStartFlags[1] = 0;
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assign wStartFlags[0] = wRxSrSop[C_RX_INPUT_STAGES];
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end // else: !if(C_PCI_DATA_WIDTH == 128)
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endgenerate
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always @(*) begin
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_rValid = rValid;
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if(_wStartFlag) begin
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_rValid = 1'b1;
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end else if (RX_SR_EOP[C_RX_INPUT_STAGES+1]) begin
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_rValid = 1'b0;
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end
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end
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always @(posedge CLK) begin
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if(rRST) begin
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rValid <= 1'b0;
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end else begin
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rValid <= _rValid;
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end
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end
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always @(posedge CLK) begin
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rRST <= RST_BUS | RST_LOGIC;
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end
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register
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#(// Parameters
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.C_WIDTH (32))
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metadata_DW0_register
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(// Outputs
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.RD_DATA (wMetadata[31:0]),
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// Inputs
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.RST_IN (0),
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.WR_DATA (RX_SR_DATA[C_RX_METADW0_INDEX +: 32]),
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.WR_EN (wRxSrSop[C_RX_METADW0_CYCLE]),
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/*AUTOINST*/
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// Inputs
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.CLK (CLK));
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register
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#(// Parameters
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.C_WIDTH (32))
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meta_DW1_register
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(// Outputs
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.RD_DATA (wMetadata[63:32]),
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// Inputs
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.RST_IN (0),
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.WR_DATA (RX_SR_DATA[C_RX_METADW1_INDEX +: 32]),
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.WR_EN (wRxSrSop[C_RX_METADW1_CYCLE]),
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/*AUTOINST*/
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// Inputs
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.CLK (CLK));
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register
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#(// Parameters
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.C_WIDTH (32))
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meta_DW2_register
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(// Outputs
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.RD_DATA (wMetadata[95:64]),
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// Inputs
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.RST_IN (0),
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.WR_DATA (RX_SR_DATA[C_RX_METADW2_INDEX +: 32]),
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.WR_EN (wRxSrSop[C_RX_METADW2_CYCLE]),
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/*AUTOINST*/
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// Inputs
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.CLK (CLK));
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register
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#(// Parameters
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.C_WIDTH (`TLP_TYPE_W))
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metadata_type_register
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(// Outputs
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.RD_DATA (wType),
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// Inputs
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.RST_IN (0),
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.WR_DATA (RX_SR_DATA[(`TLP_TYPE_I + C_PCI_DATA_WIDTH*C_RX_INPUT_STAGES) +: `TLP_TYPE_W]),
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.WR_EN (wRxSrSop[`TLP_TYPE_I/C_PCI_DATA_WIDTH + C_RX_INPUT_STAGES]),
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/*AUTOINST*/
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// Inputs
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.CLK (CLK));
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register
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#(// Parameters
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.C_WIDTH (`TLP_LEN_W))
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metadata_length_register
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(// Outputs
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.RD_DATA (wLength),
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// Inputs
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.RST_IN (0),
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.WR_DATA (RX_SR_DATA[((`TLP_LEN_I%C_PCI_DATA_WIDTH) + C_PCI_DATA_WIDTH*C_RX_INPUT_STAGES) +: `TLP_LEN_W]),
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.WR_EN (wRxSrSop[`TLP_LEN_I/C_PCI_DATA_WIDTH + C_RX_INPUT_STAGES]),
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/*AUTOINST*/
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// Inputs
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.CLK (CLK));
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register
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#(// Parameters
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.C_WIDTH (`TLP_CPLADDR_W))
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metadata_address_register
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(// Outputs
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.RD_DATA (wAddr),
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// Inputs
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.RST_IN (0),
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.WR_DATA (RX_SR_DATA[((`TLP_CPLADDR_I%C_PCI_DATA_WIDTH) + C_PCI_DATA_WIDTH*C_RX_INPUT_STAGES) +: `TLP_CPLADDR_W]),
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.WR_EN (wRxSrSop[`TLP_CPLADDR_I/C_PCI_DATA_WIDTH + C_RX_INPUT_STAGES]),
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/*AUTOINST*/
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// Inputs
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.CLK (CLK));
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register
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#(// Parameters
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.C_WIDTH (1),
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.C_VALUE (1'b0)
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/*AUTOINSTPARAM*/)
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start_flag_register
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(// Outputs
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.RD_DATA (wStartFlag),
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// Inputs
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.RST_IN (0),
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.WR_DATA (_wStartFlag),
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.WR_EN (1),
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/*AUTOINST*/
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// Inputs
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.CLK (CLK));
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assign wStartMask = {C_PCI_DATA_WIDTH/32{1'b1}} << ({C_OFFSET_WIDTH{wStartFlag}}& wStartOffset[C_OFFSET_WIDTH-1:0]);
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offset_to_mask
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#(// Parameters
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.C_MASK_SWAP (0),
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.C_MASK_WIDTH (C_PCI_DATA_WIDTH/32)
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/*AUTOINSTPARAM*/)
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o2m_ef
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(// Outputs
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.MASK (wEndMask),
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// Inputs
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.OFFSET_ENABLE (wEndFlag),
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.OFFSET (wEndOffset)
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/*AUTOINST*/);
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generate
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if(C_RX_OUTPUT_STAGES == 0) begin
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assign RXC_DATA_WORD_ENABLE = {wEndMask & wStartMask} & {C_PCI_DATA_WIDTH/32{~rValid | ~wMetadata[`TLP_PAYBIT_I]}};
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end else begin
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register
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#(// Parameters
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.C_WIDTH (C_PCI_DATA_WIDTH/32),
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.C_VALUE (0)
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/*AUTOINSTPARAM*/)
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dw_enable
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(// Outputs
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.RD_DATA (wRxcDataWordEnable),
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// Inputs
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.RST_IN (~rValid | ~wMetadata[`TLP_PAYBIT_I]),
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.WR_DATA (wEndMask & wStartMask),
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.WR_EN (1),
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/*AUTOINST*/
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// Inputs
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.CLK (CLK));
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pipeline
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#(// Parameters
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.C_DEPTH (C_RX_OUTPUT_STAGES-1),
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.C_WIDTH (C_PCI_DATA_WIDTH/32),
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.C_USE_MEMORY (0)
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/*AUTOINSTPARAM*/)
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dw_pipeline
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(// Outputs
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.WR_DATA_READY (), // Pinned to 1
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.RD_DATA (RXC_DATA_WORD_ENABLE),
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.RD_DATA_VALID (),
|
|
// Inputs
|
|
.WR_DATA (wRxcDataWordEnable),
|
|
.WR_DATA_VALID (1),
|
|
.RD_DATA_READY (1'b1),
|
|
.RST_IN (rRST),
|
|
/*AUTOINST*/
|
|
// Inputs
|
|
.CLK (CLK));
|
|
|
|
end
|
|
endgenerate
|
|
|
|
pipeline
|
|
#(// Parameters
|
|
.C_DEPTH (C_RX_OUTPUT_STAGES),
|
|
.C_WIDTH (`TLP_CPLHDR_W + 2*(clog2s(C_PCI_DATA_WIDTH/32) + 1)),
|
|
.C_USE_MEMORY (0)
|
|
/*AUTOINSTPARAM*/)
|
|
output_pipeline
|
|
(// Outputs
|
|
.WR_DATA_READY (), // Pinned to 1
|
|
.RD_DATA ({wRxcMetadata,wRxcDataStartFlag,wRxcDataStartOffset,wRxcDataEndFlag,wRxcDataEndOffset}),
|
|
.RD_DATA_VALID (wRxcDataValid),
|
|
// Inputs
|
|
.WR_DATA ({wMetadata, wStartFlag,wStartOffset[C_OFFSET_WIDTH-1:0],wEndFlag,wEndOffset[C_OFFSET_WIDTH-1:0]}),
|
|
.WR_DATA_VALID (rValid & RX_SR_VALID[C_TOTAL_STAGES - C_RX_OUTPUT_STAGES]),
|
|
.RD_DATA_READY (1'b1),
|
|
.RST_IN (rRST),
|
|
/*AUTOINST*/
|
|
// Inputs
|
|
.CLK (CLK));
|
|
|
|
// Start Flag Shift Register. Data enables are derived from the
|
|
// taps on this shift register.
|
|
shiftreg
|
|
#(// Parameters
|
|
.C_DEPTH (C_RX_PIPELINE_DEPTH),
|
|
.C_WIDTH (1'b1),
|
|
.C_VALUE (0)
|
|
/*AUTOINSTPARAM*/)
|
|
sop_shiftreg_inst
|
|
(// Outputs
|
|
.RD_DATA (wRxSrSop),
|
|
// Inputs
|
|
.WR_DATA (RX_TLP_START_FLAG & RX_TLP_VALID &
|
|
(RX_SR_DATA[`TLP_TYPE_R] == `TLP_TYPE_CPL)),
|
|
.RST_IN (0),
|
|
/*AUTOINST*/
|
|
// Inputs
|
|
.CLK (CLK));
|
|
|
|
endmodule
|