design/sys/iop/mcu/rtl/mcu_ucbin_ctl.v

// ========== Copyright Header Begin ==========================================
//
// OpenSPARC T2 Processor File: mcu_ucbin_ctl.v
// Copyright (C) 1995-2007 Sun Microsystems, Inc. All Rights Reserved
// 4150 Network Circle, Santa Clara, California 95054, U.S.A.
//
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//
// This program is free software; you can redistribute it and/or modify
// it under the terms of the GNU General Public License as published by
// the Free Software Foundation; version 2 of the License.
//
// This 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.
//
// You should have received a copy of the GNU General Public License
// along with this program; if not, write to the Free Software
// Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
//
// For the avoidance of doubt, and except that if any non-GPL license
// choice is available it will apply instead, Sun elects to use only
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// ========== Copyright Header End ============================================
module mcu_ucbin_ctl (
  l1clk,
  scan_in,
  scan_out,
  tcu_aclk,
  tcu_bclk,
  tcu_scan_en,
  vld,
  data,
  stall,
  indata_buf_vld,
  indata_buf,
  stall_a1);
wire siclk;
wire soclk;
wire se;
wire not_stall_d1;
wire not_stall_a1;
wire vld_d1_ff_scanin;
wire vld_d1_ff_scanout;
wire data_d1_ff_scanin;
wire data_d1_ff_scanout;
wire stall_ff_scanin;
wire stall_ff_scanout;
wire stall_d1_ff_scanin;
wire stall_d1_ff_scanout;
wire vld_buf0_ff_scanin;
wire vld_buf0_ff_scanout;
wire data_buf0_ff_scanin;
wire data_buf0_ff_scanout;
wire skid_buf1_en_ff_scanin;
wire skid_buf1_en_ff_scanout;
wire vld_buf1_ff_scanin;
wire vld_buf1_ff_scanout;
wire data_buf1_ff_scanin;
wire data_buf1_ff_scanout;
wire skid_buf1_sel_ff_scanin;
wire skid_buf1_sel_ff_scanout;
wire indata_vec_ff_scanin;
wire indata_vec_ff_scanout;
wire indata_buf_ff_scanin;
wire indata_buf_ff_scanout;
wire indata_vec0_d1_ff_scanin;
wire indata_vec0_d1_ff_scanout;


//   parameter UCB_BUS_WIDTH = 4;
//   parameter REG_WIDTH = 64;


////////////////////////////////////////////////////////////////////////
// Signal declarations
////////////////////////////////////////////////////////////////////////
   // Global interface
input           l1clk;
input           scan_in;
output          scan_out;
input           tcu_aclk;
input           tcu_bclk;
input           tcu_scan_en;

// UCB bus interface
input           vld;
input [3:0]     data;
output          stall;


// Local interface
output          indata_buf_vld;
output [127:0]  indata_buf;
input           stall_a1;


// Internal signals
wire            vld_d1;
wire            stall_d1;
wire [3:0]      data_d1;
wire            skid_buf0_en;
wire            vld_buf0;
wire [3:0]      data_buf0;
wire            skid_buf1_en;
wire            vld_buf1;
wire [3:0]      data_buf1;
wire            skid_buf0_sel;
wire            skid_buf1_sel;
wire            vld_mux;
wire [3:0]      data_mux;
wire [31:0]     indata_vec_next;
wire [31:0]     indata_vec;
wire [127:0]    indata_buf_next;
wire            indata_vec0_d1;

////////////////////////////////////////////////////////////////////////
// Code starts here
////////////////////////////////////////////////////////////////////////

// Scan reassigns
assign siclk = tcu_aclk;
assign soclk = tcu_bclk;
assign se = tcu_scan_en;

assign not_stall_d1 = ~stall_d1;
assign not_stall_a1 = ~stall_a1;

/************************************************************
 * UCB bus interface flops
 * This is to make signals going between IOB and UCB flop-to-flop
 * to improve timing.
 ************************************************************/
mcu_ucbin_ctl_msff_ctl_macro__en_1__width_1 vld_d1_ff  (
        .scan_in(vld_d1_ff_scanin),
        .scan_out(vld_d1_ff_scanout),
        .din(vld),
        .en(not_stall_d1),
        .l1clk(l1clk),
        .dout(vld_d1),
  .siclk(siclk),
  .soclk(soclk));

mcu_ucbin_ctl_msff_ctl_macro__en_1__width_4 data_d1_ff  (
        .scan_in(data_d1_ff_scanin),
        .scan_out(data_d1_ff_scanout),
        .din(data),
        .en(not_stall_d1),
        .l1clk(l1clk),
        .dout(data_d1),
  .siclk(siclk),
  .soclk(soclk));

mcu_ucbin_ctl_msff_ctl_macro__width_1 stall_ff  (
        .scan_in(stall_ff_scanin),
        .scan_out(stall_ff_scanout),
        .din(stall_a1),
        .l1clk(l1clk),
        .dout(stall),
  .siclk(siclk),
  .soclk(soclk));

mcu_ucbin_ctl_msff_ctl_macro__width_1 stall_d1_ff  (
        .scan_in(stall_d1_ff_scanin),
        .scan_out(stall_d1_ff_scanout),
        .din(stall),
        .l1clk(l1clk),
        .dout(stall_d1),
  .siclk(siclk),
  .soclk(soclk));


/************************************************************
 * Skid buffer
 * We need a two deep skid buffer to handle stalling.
 ************************************************************/
// Assertion: stall has to be deasserted for more than 1 cycle
//            ie time between two separate stalls has to be
//            at least two cycles.  Otherwise, contents from
//            skid buffer will be lost.

// Buffer 0
assign   skid_buf0_en = stall_a1 & ~stall;

mcu_ucbin_ctl_msff_ctl_macro__en_1 vld_buf0_ff  (
        .scan_in(vld_buf0_ff_scanin),
        .scan_out(vld_buf0_ff_scanout),
        .din(vld_d1),
        .en(skid_buf0_en),
        .l1clk(l1clk),
        .dout(vld_buf0),
  .siclk(siclk),
  .soclk(soclk));

mcu_ucbin_ctl_msff_ctl_macro__en_1__width_4 data_buf0_ff  (
        .scan_in(data_buf0_ff_scanin),
        .scan_out(data_buf0_ff_scanout),
        .din(data_d1),
        .en(skid_buf0_en),
        .l1clk(l1clk),
        .dout(data_buf0),
  .siclk(siclk),
  .soclk(soclk));

// Buffer 1
mcu_ucbin_ctl_msff_ctl_macro__width_1 skid_buf1_en_ff  (
        .scan_in(skid_buf1_en_ff_scanin),
        .scan_out(skid_buf1_en_ff_scanout),
        .din(skid_buf0_en),
        .l1clk(l1clk),
        .dout(skid_buf1_en),
  .siclk(siclk),
  .soclk(soclk));

mcu_ucbin_ctl_msff_ctl_macro__en_1__width_1 vld_buf1_ff  (
        .scan_in(vld_buf1_ff_scanin),
        .scan_out(vld_buf1_ff_scanout),
        .din(vld_d1),
        .en(skid_buf1_en),
        .l1clk(l1clk),
        .dout(vld_buf1),
  .siclk(siclk),
  .soclk(soclk));

mcu_ucbin_ctl_msff_ctl_macro__en_1__width_4 data_buf1_ff  (
        .scan_in(data_buf1_ff_scanin),
        .scan_out(data_buf1_ff_scanout),
        .din(data_d1),
        .en(skid_buf1_en),
        .l1clk(l1clk),
        .dout(data_buf1),
  .siclk(siclk),
  .soclk(soclk));


/************************************************************
 * Mux between skid buffer and interface flop
 ************************************************************/
// Assertion: stall has to be deasserted for more than 1 cycle
//            ie time between two separate stalls has to be
//            at least two cycles.  Otherwise, contents from
//            skid buffer will be lost.

assign   skid_buf0_sel = ~stall_a1 & stall;

mcu_ucbin_ctl_msff_ctl_macro__width_1 skid_buf1_sel_ff  (
        .scan_in(skid_buf1_sel_ff_scanin),
        .scan_out(skid_buf1_sel_ff_scanout),
        .din(skid_buf0_sel),
        .l1clk(l1clk),
        .dout(skid_buf1_sel),
  .siclk(siclk),
  .soclk(soclk));

assign   vld_mux = skid_buf0_sel ? vld_buf0 :
                   skid_buf1_sel ? vld_buf1 : vld_d1;

assign   data_mux = skid_buf0_sel ? data_buf0 :
                    skid_buf1_sel ? data_buf1 : data_d1;


/************************************************************
 * Assemble inbound data
 ************************************************************/
// valid vector
assign   indata_vec_next = {vld_mux, indata_vec[31:1]};
mcu_ucbin_ctl_msff_ctl_macro__en_1__width_32 indata_vec_ff  (
        .scan_in(indata_vec_ff_scanin),
        .scan_out(indata_vec_ff_scanout),
        .din(indata_vec_next),
        .en(not_stall_a1),
        .l1clk(l1clk),
        .dout(indata_vec),
  .siclk(siclk),
  .soclk(soclk));

// data buffer
assign   indata_buf_next = {data_mux, indata_buf[127:4]};
mcu_ucbin_ctl_msff_ctl_macro__en_1__width_128 indata_buf_ff  (
        .scan_in(indata_buf_ff_scanin),
        .scan_out(indata_buf_ff_scanout),
        .din(indata_buf_next),
        .en(not_stall_a1),
        .l1clk(l1clk),
        .dout(indata_buf),
  .siclk(siclk),
  .soclk(soclk));

// detect a new packet
mcu_ucbin_ctl_msff_ctl_macro__en_1__width_1 indata_vec0_d1_ff  (
        .scan_in(indata_vec0_d1_ff_scanin),
        .scan_out(indata_vec0_d1_ff_scanout),
        .din(indata_vec[0]),
        .en(not_stall_a1),
        .l1clk(l1clk),
        .dout(indata_vec0_d1),
  .siclk(siclk),
  .soclk(soclk));

assign        indata_buf_vld = indata_vec[0] & ~indata_vec0_d1;


// fixscan start:
assign vld_d1_ff_scanin          = scan_in                  ;
assign data_d1_ff_scanin         = vld_d1_ff_scanout        ;
assign stall_ff_scanin           = data_d1_ff_scanout       ;
assign stall_d1_ff_scanin        = stall_ff_scanout         ;
assign vld_buf0_ff_scanin        = stall_d1_ff_scanout      ;
assign data_buf0_ff_scanin       = vld_buf0_ff_scanout      ;
assign skid_buf1_en_ff_scanin    = data_buf0_ff_scanout     ;
assign vld_buf1_ff_scanin        = skid_buf1_en_ff_scanout  ;
assign data_buf1_ff_scanin       = vld_buf1_ff_scanout      ;
assign skid_buf1_sel_ff_scanin   = data_buf1_ff_scanout     ;
assign indata_vec_ff_scanin      = skid_buf1_sel_ff_scanout ;
assign indata_buf_ff_scanin      = indata_vec_ff_scanout    ;
assign indata_vec0_d1_ff_scanin  = indata_buf_ff_scanout    ;
assign scan_out                  = indata_vec0_d1_ff_scanout;
// fixscan end:
endmodule


// any PARAMS parms go into naming of macro

module mcu_ucbin_ctl_msff_ctl_macro__en_1__width_1 (
  din,
  en,
  l1clk,
  scan_in,
  siclk,
  soclk,
  dout,
  scan_out);
wire [0:0] fdin;

  input [0:0] din;
  input en;
  input l1clk;
  input scan_in;


  input siclk;
  input soclk;

  output [0:0] dout;
  output scan_out;
assign fdin[0:0] = (din[0:0] & {1{en}}) | (dout[0:0] & ~{1{en}});


dff #(1)  d0_0 (
.l1clk(l1clk),
.siclk(siclk),
.soclk(soclk),
.d(fdin[0:0]),
.si(scan_in),
.so(scan_out),
.q(dout[0:0])
);


endmodule


// any PARAMS parms go into naming of macro

module mcu_ucbin_ctl_msff_ctl_macro__en_1__width_4 (
  din,
  en,
  l1clk,
  scan_in,
  siclk,
  soclk,
  dout,
  scan_out);
wire [3:0] fdin;
wire [2:0] so;

  input [3:0] din;
  input en;
  input l1clk;
  input scan_in;


  input siclk;
  input soclk;

  output [3:0] dout;
  output scan_out;
assign fdin[3:0] = (din[3:0] & {4{en}}) | (dout[3:0] & ~{4{en}});


dff #(4)  d0_0 (
.l1clk(l1clk),
.siclk(siclk),
.soclk(soclk),
.d(fdin[3:0]),
.si({scan_in,so[2:0]}),
.so({so[2:0],scan_out}),
.q(dout[3:0])
);


endmodule


// any PARAMS parms go into naming of macro

module mcu_ucbin_ctl_msff_ctl_macro__width_1 (
  din,
  l1clk,
  scan_in,
  siclk,
  soclk,
  dout,
  scan_out);
wire [0:0] fdin;

  input [0:0] din;
  input l1clk;
  input scan_in;


  input siclk;
  input soclk;

  output [0:0] dout;
  output scan_out;
assign fdin[0:0] = din[0:0];


dff #(1)  d0_0 (
.l1clk(l1clk),
.siclk(siclk),
.soclk(soclk),
.d(fdin[0:0]),
.si(scan_in),
.so(scan_out),
.q(dout[0:0])
);


endmodule


// any PARAMS parms go into naming of macro

module mcu_ucbin_ctl_msff_ctl_macro__en_1 (
  din,
  en,
  l1clk,
  scan_in,
  siclk,
  soclk,
  dout,
  scan_out);
wire [0:0] fdin;

  input [0:0] din;
  input en;
  input l1clk;
  input scan_in;


  input siclk;
  input soclk;

  output [0:0] dout;
  output scan_out;
assign fdin[0:0] = (din[0:0] & {1{en}}) | (dout[0:0] & ~{1{en}});


dff #(1)  d0_0 (
.l1clk(l1clk),
.siclk(siclk),
.soclk(soclk),
.d(fdin[0:0]),
.si(scan_in),
.so(scan_out),
.q(dout[0:0])
);


endmodule


// any PARAMS parms go into naming of macro

module mcu_ucbin_ctl_msff_ctl_macro__en_1__width_32 (
  din,
  en,
  l1clk,
  scan_in,
  siclk,
  soclk,
  dout,
  scan_out);
wire [31:0] fdin;
wire [30:0] so;

  input [31:0] din;
  input en;
  input l1clk;
  input scan_in;


  input siclk;
  input soclk;

  output [31:0] dout;
  output scan_out;
assign fdin[31:0] = (din[31:0] & {32{en}}) | (dout[31:0] & ~{32{en}});


dff #(32)  d0_0 (
.l1clk(l1clk),
.siclk(siclk),
.soclk(soclk),
.d(fdin[31:0]),
.si({scan_in,so[30:0]}),
.so({so[30:0],scan_out}),
.q(dout[31:0])
);


endmodule


// any PARAMS parms go into naming of macro

module mcu_ucbin_ctl_msff_ctl_macro__en_1__width_128 (
  din,
  en,
  l1clk,
  scan_in,
  siclk,
  soclk,
  dout,
  scan_out);
wire [127:0] fdin;
wire [126:0] so;

  input [127:0] din;
  input en;
  input l1clk;
  input scan_in;


  input siclk;
  input soclk;

  output [127:0] dout;
  output scan_out;
assign fdin[127:0] = (din[127:0] & {128{en}}) | (dout[127:0] & ~{128{en}});


dff #(128)  d0_0 (
.l1clk(l1clk),
.siclk(siclk),
.soclk(soclk),
.d(fdin[127:0]),
.si({scan_in,so[126:0]}),
.so({so[126:0],scan_out}),
.q(dout[127:0])
);


endmodule