design/sys/iop/dmu/rtl/dmu_mmu_rcb.v

// ========== Copyright Header Begin ==========================================
//
// OpenSPARC T2 Processor File: dmu_mmu_rcb.v
// Copyright (C) 1995-2007 Sun Microsystems, Inc. All Rights Reserved
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// GNU General Public License for more details.
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// ========== Copyright Header End ============================================
module dmu_mmu_rcb
  (
   clk,                         // clock
   rst_l,                       // Synchronous reset
   j2d_mmu_addr,                // jbc snoop address
   j2d_mmu_addr_vld,            // jbc snoop address valid
   cl2mm_tcr_ack,               // clu tcr acknowledge
   cl2mm_tdr_rcd,               // clu tdr record
   cl2mm_tdr_vld,               // clu tdr valid
   csr2rcb_se,                  // csr snoop enable
//   csr2rcb_tb,                        // csr tsb base address
//   csr2rcb_ts,                        // csr tsb size
   tcb2rcb_tag,                 // tcb tcr tag
   tcb2rcb_req,                 // tcb tcr request
   tlb2rcb_addr,                // tlb tcr address
//   d2j_tsb_enable,            // jbc tsb snoop enable
//   d2j_tsb_base,              // jbc tsb base address
//   d2j_tsb_size,              // jbc tsb size
   mm2cl_tcr_rcd,               // clu tcr record
   mm2cl_tcr_req,               // clu tcr request
   rcb2ptb_addr,                // ptb snoop address
   rcb2ptb_vld,                 // ptb snoop valid
   rcb2tcb_ack,                 // tcb tcr acknowledge
   rcb2tcb_err,                 // tcb tdr errors
   rcb2tcb_tag,                 // tcb tdr tag
   rcb2tcb_vld,                 // tcb tdr valid
   rcb2tlb_dhi,                 // tlb tdr data high
   rcb2tlb_dlo                  // tlb tdr data low
   );

// ----------------------------------------------------------------------------
// Ports
// ----------------------------------------------------------------------------
  input                                 clk;
  input                                 rst_l;

  input  [`FIRE_J2D_MMU_ADDR_BITS]      j2d_mmu_addr;
  input                                 j2d_mmu_addr_vld;
  input                                 cl2mm_tcr_ack;
  input  [`FIRE_DLC_TDR_BITS]           cl2mm_tdr_rcd;
  input                                 cl2mm_tdr_vld;
  input                                 csr2rcb_se;
//  input  [`FIRE_DLC_MMU_CSR_TB_BITS]  csr2rcb_tb;
//  input  [`FIRE_DLC_MMU_CSR_TS_BITS]  csr2rcb_ts;
  input  [`FIRE_DLC_MMU_TAG_PTR_BITS]   tcb2rcb_tag;
  input                                 tcb2rcb_req;
  input  [`FIRE_DLC_MMU_PTD_TAG_BITS]   tlb2rcb_addr;

//  output                              d2j_tsb_enable;
//  output [`FIRE_D2J_TSB_BASE_BITS]    d2j_tsb_base;
//  output [`FIRE_D2J_TSB_SIZE_BITS]    d2j_tsb_size;
  output [`FIRE_DLC_TCR_BITS]           mm2cl_tcr_rcd;
  output                                mm2cl_tcr_req;
  output [`FIRE_DLC_MMU_PTD_TAG_BITS]   rcb2ptb_addr;
  output                                rcb2ptb_vld;
  output                                rcb2tcb_ack;
  output [`FIRE_DLC_MMU_RCB_ERR_BITS]   rcb2tcb_err;
  output [`FIRE_DLC_MMU_TAG_PTR_BITS]   rcb2tcb_tag;
  output                                rcb2tcb_vld;
  output [`FIRE_DLC_MMU_TDR_DATA_BITS]  rcb2tlb_dhi;
  output [`FIRE_DLC_MMU_TDR_DATA_BITS]  rcb2tlb_dlo;

// ----------------------------------------------------------------------------
// Variables
// ----------------------------------------------------------------------------
//  wire [`FIRE_D2J_TSB_BASE_BITS]      d2j_tsb_base;
//  wire [`FIRE_D2J_TSB_SIZE_BITS]      d2j_tsb_size;
  wire [`FIRE_DLC_TCR_BITS]             mm2cl_tcr_rcd;
  wire [`FIRE_DLC_MMU_RCB_ERR_BITS]     rcb2tcb_err;
  wire [`FIRE_DLC_MMU_TAG_PTR_BITS]     rcb2tcb_tag;
  wire [`FIRE_DLC_MMU_TDR_DATA_BITS]    rcb2tlb_dhi, rcb2tlb_dlo;
  wire [127:0]                          data;
  wire [3:0]                            dpar, dpe;

  reg  [`FIRE_DLC_MMU_PTD_TAG_BITS]     rcb2ptb_addr;
  reg                                   rcb2ptb_vld;

// ----------------------------------------------------------------------------
// Zero In Checkers
// ----------------------------------------------------------------------------

  // 0in odd_parity -var {data[127:96], dpar[3]} -active cl2mm_tdr_vld
  // 0in odd_parity -var {data[95:64],  dpar[2]} -active cl2mm_tdr_vld
  // 0in odd_parity -var {data[63:32],  dpar[1]} -active cl2mm_tdr_vld
  // 0in odd_parity -var {data[31:0],   dpar[0]} -active cl2mm_tdr_vld

// ----------------------------------------------------------------------------
// Combinational
// ----------------------------------------------------------------------------

// jbc tsb enable, base, and size
//  wire         d2j_tsb_enable = csr2rcb_se;
//  assign d2j_tsb_base   = csr2rcb_tb;
//  assign d2j_tsb_size   = csr2rcb_ts;

// clu tablewalk command request record
  assign mm2cl_tcr_rcd[`FIRE_DLC_TCR_MTAG_BITS] = tcb2rcb_tag;
  assign mm2cl_tcr_rcd[`FIRE_DLC_TCR_ADDR_BITS] = { {4{1'b0}},tlb2rcb_addr};

// clu tablewalk command record request and acknowledge
  wire   mm2cl_tcr_req = tcb2rcb_req;
  wire   rcb2tcb_ack   = cl2mm_tcr_ack;

// tdr record parsing
  assign data = cl2mm_tdr_rcd[`FIRE_DLC_TDR_DATA_BITS];
  assign dpar = cl2mm_tdr_rcd[`FIRE_DLC_TDR_DPAR_BITS];

// dpe is data parity error bits, one per 32 bits of data
  assign dpe[3] = ^data[127:96] ^ ~dpar[3];
  assign dpe[2] = ^data[95:64]  ^ ~dpar[2];
  assign dpe[1] = ^data[63:32]  ^ ~dpar[1];
  assign dpe[0] = ^data[31:0]   ^ ~dpar[0];

// tcb tablewalk mtag
  assign rcb2tcb_tag = cl2mm_tdr_rcd[`FIRE_DLC_TDR_MTAG_BITS];

// tcb tablewalk valid
  wire   rcb2tcb_vld = cl2mm_tdr_vld;

// tcb tablewalk errors
  assign rcb2tcb_err[0] = cl2mm_tdr_rcd[`FIRE_DLC_TDR_CERR_BITS];
  assign rcb2tcb_err[1] = cl2mm_tdr_rcd[`FIRE_DLC_TDR_DERR_BITS];
  assign rcb2tcb_err[2] = |dpe;

// tlb tablewalk data
  assign rcb2tlb_dhi[`FIRE_DLC_MMU_TDR_KEY_BITS]    = data[`FIRE_DLC_MMU_TDD_KEY_BITS];         // 16-bit Key value
  assign rcb2tlb_dhi[`FIRE_DLC_MMU_TDR_PPN_BITS] = data[`FIRE_DLC_MMU_TDD_PPN_BITS];    // physical page number
  assign rcb2tlb_dhi[`FIRE_DLC_MMU_TDR_FNM_BITS]    = data[`FIRE_DLC_MMU_TDD_FNM_BITS];         // 3-bit Function Number
  assign rcb2tlb_dhi[`FIRE_DLC_MMU_TDR_KEYVLD_BITS]    = data[`FIRE_DLC_MMU_TDD_KEYVLD_BITS];           // valKeyid
  assign rcb2tlb_dhi[`FIRE_DLC_MMU_TDR_WRT_BITS]    = data[`FIRE_DLC_MMU_TDD_WRT_BITS];         // write enable
  assign rcb2tlb_dhi[`FIRE_DLC_MMU_TDR_VLD_BITS]    = data[`FIRE_DLC_MMU_TDD_VLD_BITS];         // valid

  wire [63:0]  datalo = data[127:64];

  assign rcb2tlb_dlo[`FIRE_DLC_MMU_TDR_KEY_BITS]    = datalo[`FIRE_DLC_MMU_TDD_KEY_BITS];               // 16-bit Key value
  assign rcb2tlb_dlo[`FIRE_DLC_MMU_TDR_PPN_BITS] = datalo[`FIRE_DLC_MMU_TDD_PPN_BITS];  // physical page number
  assign rcb2tlb_dlo[`FIRE_DLC_MMU_TDR_FNM_BITS]    = datalo[`FIRE_DLC_MMU_TDD_FNM_BITS];               // 3-bit Function Number
  assign rcb2tlb_dlo[`FIRE_DLC_MMU_TDR_KEYVLD_BITS]    = datalo[`FIRE_DLC_MMU_TDD_KEYVLD_BITS];         // valKeyid
  assign rcb2tlb_dlo[`FIRE_DLC_MMU_TDR_WRT_BITS]    = datalo[`FIRE_DLC_MMU_TDD_WRT_BITS];               // write enable
  assign rcb2tlb_dlo[`FIRE_DLC_MMU_TDR_VLD_BITS]    = datalo[`FIRE_DLC_MMU_TDD_VLD_BITS];               // valid
//  assign rcb2tlb_dlo[31:2] = {4'b0,data[102:77]};     // physical page number
//  assign rcb2tlb_dlo[1]    = data[65];                // write enable
//  assign rcb2tlb_dlo[0]    = data[64];                // valid

// ----------------------------------------------------------------------------
// Sequential
// ----------------------------------------------------------------------------
  always @ (posedge clk)
        if(~rst_l) begin
    rcb2ptb_addr <= {`FIRE_DLC_MMU_PTD_TAG_WDTH{1'b0}};
    rcb2ptb_vld  <= {{1'b0}};
    end
        else begin
    rcb2ptb_addr <= j2d_mmu_addr[38:6];
    rcb2ptb_vld  <= j2d_mmu_addr_vld & csr2rcb_se;
  end

endmodule // dmu_mmu_rcb