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/*

 * Simply RISC S1 Core Top-Level

 *

 * (C) 2007 Simply RISC LLP

 * AUTHOR: Fabrizio Fazzino <fabrizio.fazzino@srisc.com>

 *

 * LICENSE:

 * This is a Free Hardware Design; you can redistribute it and/or

 * modify it under the terms of the GNU General Public License

 * version 2 as published by the Free Software Foundation.

 * The above named program is distributed in the hope that it will

 * be useful, but WITHOUT ANY WARRANTY; without even the implied

 * warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.

 * See the GNU General Public License for more details.

 *

 * DESCRIPTION:

 * This block implements the top-level of the S1 Core.

 * It is just a schematic with four instances:

 * 1) one single SPARC Core of the OpenSPARC T1;

 * 2) a SPARC Core to Wishbone Master bridge;

 * 3) a Reset Controller;

 * 4) an Interrupt Controller.

 *

 */

module s1_top (

    input         sys_clock_i,

    input         sys_reset_i,

    input         eth_irq_i,

    input         wbm_ack_i,

    input  [63:0] wbm_data_i,

    output        wbm_cycle_o,

    output        wbm_strobe_o,

    output        wbm_we_o,

    output [63:0] wbm_addr_o,

    output [63:0] wbm_data_o,

    output [ 7:0] wbm_sel_o

);

  /*

   * Wires

   */

  // Wires connected to SPARC Core outputs

  // pcx

  wire [4:0]   spc_pcx_req_pq;    // processor to pcx request

  wire         spc_pcx_atom_pq;   // processor to pcx atomic request

  wire [123:0] spc_pcx_data_pa;  // processor to pcx packet

  // shadow scan

  wire     spc_sscan_so;         // From ifu of sparc_ifu.v

  wire     spc_scanout0;         // From test_stub of test_stub_bist.v

  wire     spc_scanout1;         // From test_stub of test_stub_bist.v

  // bist

  wire     tst_ctu_mbist_done;  // From test_stub of test_stub_two_bist.v

  wire     tst_ctu_mbist_fail;  // From test_stub of test_stub_two_bist.v

  // fuse

  wire     spc_efc_ifuse_data;     // From ifu of sparc_ifu.v

  wire     spc_efc_dfuse_data;     // From ifu of sparc_ifu.v

  // Wires connected to SPARC Core inputs

  // cpx interface

  wire [4:0] pcx_spc_grant_px; // pcx to processor grant info  

  wire       cpx_spc_data_rdy_cx2; // cpx data inflight to sparc  

  wire [144:0] cpx_spc_data_cx2;     // cpx to sparc data packet

  wire [3:0]  const_cpuid;

  wire [7:0]  const_maskid;           // To ifu of sparc_ifu.v

  // sscan

  wire        ctu_tck;                // To ifu of sparc_ifu.v

  wire        ctu_sscan_se;           // To ifu of sparc_ifu.v

  wire        ctu_sscan_snap;         // To ifu of sparc_ifu.v

  wire [3:0]  ctu_sscan_tid;          // To ifu of sparc_ifu.v

  // bist

  wire        ctu_tst_mbist_enable;   // To test_stub of test_stub_bist.v

  // efuse

  wire        efc_spc_fuse_clk1;

  wire        efc_spc_fuse_clk2;

  wire        efc_spc_ifuse_ashift;

  wire        efc_spc_ifuse_dshift;

  wire        efc_spc_ifuse_data;

  wire        efc_spc_dfuse_ashift;

  wire        efc_spc_dfuse_dshift;

  wire        efc_spc_dfuse_data;

  // scan and macro test

  wire        ctu_tst_macrotest;      // To test_stub of test_stub_bist.v

  wire        ctu_tst_scan_disable;   // To test_stub of test_stub_bist.v

  wire        ctu_tst_short_chain;    // To test_stub of test_stub_bist.v

  wire        global_shift_enable;    // To test_stub of test_stub_two_bist.v

  wire        ctu_tst_scanmode;       // To test_stub of test_stub_two_bist.v

  wire        spc_scanin0;

  wire        spc_scanin1;

  // clk

  wire        cluster_cken;           // To spc_hdr of cluster_header.v

  wire        gclk;                   // To spc_hdr of cluster_header.v

  // reset

  wire        cmp_grst_l;

  wire        cmp_arst_l;

  wire        ctu_tst_pre_grst_l;     // To test_stub of test_stub_bist.v

  wire        adbginit_l;             // To spc_hdr of cluster_header.v

  wire        gdbginit_l;             // To spc_hdr of cluster_header.v

  // Reset signal from the reset controller to the bridge

  wire sys_reset_final;

  // Interrupt Source from the interrupt controller to the bridge

  /*

   * SPARC Core module instance

   */

reg [  4:0] pcx_spc_grant_px_fifo;

  sparc sparc_0 (

    // Wires connected to SPARC Core outputs

    .spc_pcx_req_pq(spc_pcx_req_pq),

    .spc_pcx_atom_pq(spc_pcx_atom_pq),

    .spc_pcx_data_pa(spc_pcx_data_pa),

    .spc_sscan_so(spc_sscan_so),

    .spc_scanout0(spc_scanout0),

    .spc_scanout1(spc_scanout1),

    .tst_ctu_mbist_done(tst_ctu_mbist_done),

    .tst_ctu_mbist_fail(tst_ctu_mbist_fail),

    .spc_efc_ifuse_data(spc_efc_ifuse_data),

    .spc_efc_dfuse_data(spc_efc_dfuse_data),

    // Wires connected to SPARC Core inputs

    .pcx_spc_grant_px(pcx_spc_grant_px),

    .cpx_spc_data_rdy_cx2(cpx_spc_data_rdy_cx2),

    .cpx_spc_data_cx2(cpx_spc_data_cx2),

    .const_cpuid(const_cpuid),

    .const_maskid(const_maskid),

    .ctu_tck(ctu_tck),

    .ctu_sscan_se(ctu_sscan_se),

    .ctu_sscan_snap(ctu_sscan_snap),

    .ctu_sscan_tid(ctu_sscan_tid),

    .ctu_tst_mbist_enable(ctu_tst_mbist_enable),

    .efc_spc_fuse_clk1(efc_spc_fuse_clk1),

    .efc_spc_fuse_clk2(efc_spc_fuse_clk2),

    .efc_spc_ifuse_ashift(efc_spc_ifuse_ashift),

    .efc_spc_ifuse_dshift(efc_spc_ifuse_dshift),

    .efc_spc_ifuse_data(efc_spc_ifuse_data),

    .efc_spc_dfuse_ashift(efc_spc_dfuse_ashift),

    .efc_spc_dfuse_dshift(efc_spc_dfuse_dshift),

    .efc_spc_dfuse_data(efc_spc_dfuse_data),

    .ctu_tst_macrotest(ctu_tst_macrotest),

    .ctu_tst_scan_disable(ctu_tst_scan_disable),

    .ctu_tst_short_chain(ctu_tst_short_chain),

    .global_shift_enable(global_shift_enable),

    .ctu_tst_scanmode(ctu_tst_scanmode),

    .spc_scanin0(spc_scanin0),

    .spc_scanin1(spc_scanin1),

    .cluster_cken(cluster_cken),

    .gclk(gclk),

    .cmp_grst_l(cmp_grst_l),

    .cmp_arst_l(cmp_arst_l),

    .ctu_tst_pre_grst_l(ctu_tst_pre_grst_l),

    .adbginit_l(adbginit_l),

    .gdbginit_l(gdbginit_l)

  );

  /*

   * SPARC Core to Wishbone Master bridge

   */

wire         fp_req;

wire [123:0] fp_pcx;

wire [  7:0] fp_rdy;

wire [144:0] fp_cpx;

os2wb os2wb_inst (

    .clk(sys_clock_i),

    .rstn(~sys_reset_final),

    .pcx_req(spc_pcx_req_pq),

    .pcx_atom(spc_pcx_atom_pq),

    .pcx_data(spc_pcx_data_pa),

    .pcx_grant(pcx_spc_grant_px),

    .cpx_ready(cpx_spc_data_rdy_cx2),

    .cpx_packet(cpx_spc_data_cx2),

    .wb_data_i(wbm_data_i),

    .wb_ack(wbm_ack_i),

    .wb_cycle(wbm_cycle_o),

    .wb_strobe(wbm_strobe_o),

    .wb_we(wbm_we_o),

    .wb_sel(wbm_sel_o),

    .wb_addr(wbm_addr_o),

    .wb_data_o(wbm_data_o),

    .fp_pcx(fp_pcx),

    .fp_req(fp_req),

    .fp_cpx(fp_cpx),

    .fp_rdy(fp_rdy!=8'h00),

    .eth_int(0/*eth_irq_i*/)

);

// FPU

fpu fpu_inst(

        .pcx_fpio_data_rdy_px2(fp_req),

        .pcx_fpio_data_px2(fp_pcx),

        .arst_l(cmp_arst_l),

        .grst_l(cmp_grst_l),

        .gclk(gclk),

        .cluster_cken(cluster_cken),

        .fp_cpx_req_cq(fp_rdy),

        .fp_cpx_data_ca(fp_cpx),

        .ctu_tst_pre_grst_l(ctu_tst_pre_grst_l),

        .global_shift_enable(global_shift_enable),

        .ctu_tst_scan_disable(ctu_tst_scan_disable),

        .ctu_tst_scanmode(ctu_tst_scanmode),

        .ctu_tst_macrotest(ctu_tst_macrotest),

        .ctu_tst_short_chain(ctu_tst_short_chain),

        .si(0),

        .so()

);

  /*

   * Reset Controller

   */

  rst_ctrl rst_ctrl_0 (

    // Top-level system inputs

    .sys_clock_i(sys_clock_i),

    .sys_reset_i(sys_reset_i),

    // Reset Controller outputs connected to SPARC Core inputs

    .cluster_cken_o(cluster_cken),

    .gclk_o(gclk),

    .cmp_grst_o(cmp_grst_l),

    .cmp_arst_o(cmp_arst_l),

    .ctu_tst_pre_grst_o(ctu_tst_pre_grst_l),

    .adbginit_o(adbginit_l),

    .gdbginit_o(gdbginit_l),

    .sys_reset_final_o(sys_reset_final)

  );

  /*

   * Continuous assignments

   */

  assign const_cpuid = 4'h0;

  assign const_maskid = 8'h20;

  // sscan

  assign ctu_tck = 1'b0;

  assign ctu_sscan_se = 1'b0;

  assign ctu_sscan_snap = 1'b0;

  assign ctu_sscan_tid = 4'h1;

  // bist

  assign ctu_tst_mbist_enable = 1'b0;

  // efuse

  assign efc_spc_fuse_clk1 = 1'b0;     // Activity

  assign efc_spc_fuse_clk2 = 1'b0;     // Activity

  assign efc_spc_ifuse_ashift = 1'b0;

  assign efc_spc_ifuse_dshift = 1'b0;

  assign efc_spc_ifuse_data = 1'b0;    // Activity

  assign efc_spc_dfuse_ashift = 1'b0;

  assign efc_spc_dfuse_dshift = 1'b0;

  assign efc_spc_dfuse_data = 1'b0;    // Activity

  // scan and macro test

  assign ctu_tst_macrotest = 1'b0;

  assign ctu_tst_scan_disable = 1'b0;

  assign ctu_tst_short_chain = 1'b0;

  assign global_shift_enable = 1'b0;

  assign ctu_tst_scanmode = 1'b0;

  assign spc_scanin0 = 1'b0;

  assign spc_scanin1 = 1'b0;

endmodule