// ========== Copyright Header Begin ========================================== // // OpenSPARC T2 Processor File: ncu_i2cbuf4_ni_ctl.v // Copyright (C) 1995-2007 Sun Microsystems, Inc. All Rights Reserved // 4150 Network Circle, Santa Clara, California 95054, U.S.A. // // * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. // // 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 // the General Public License version 2 (GPLv2) at this time for any // software where a choice of GPL license versions is made // available with the language indicating that GPLv2 or any later version // may be used, or where a choice of which version of the GPL is applied is // otherwise unspecified. // // Please contact Sun Microsystems, Inc., 4150 Network Circle, Santa Clara, // CA 95054 USA or visit www.sun.com if you need additional information or // have any questions. // // ========== Copyright Header End ============================================ module ncu_i2cbuf4_ni_ctl ( iol2clk, scan_in, scan_out, tcu_pce_ov, tcu_clk_stop, tcu_scan_en, tcu_aclk, tcu_bclk, ucb_iob_vld, ucb_iob_data, iob_ucb_stall, req_ack_obj, req_ack_vld, rd_req_ack_dbl_buf) ; wire stall_d1_n; wire stall_d1; wire vld_d1_ff_scanin; wire vld_d1_ff_scanout; wire vld_d1; wire l1clk; wire rdy1; wire data_d1_ff_scanin; wire data_d1_ff_scanout; wire [3:0] data_d1; wire stall_ff_scanin; wire stall_ff_scanout; wire iob_ucb_stall_a1; wire stall_d1_ff_scanin; wire stall_d1_ff_scanout; wire rdy0_ff_scanin; wire rdy0_ff_scanout; wire rdy0; wire rdy1_ff_scanin; wire rdy1_ff_scanout; wire skid_buf0_en; wire vld_buf0_ff_scanin; wire vld_buf0_ff_scanout; wire vld_buf0; wire data_buf0_ff_scanin; wire data_buf0_ff_scanout; wire [3:0] data_buf0; wire skid_buf1_en_ff_scanin; wire skid_buf1_en_ff_scanout; wire skid_buf1_en; wire vld_buf1_ff_scanin; wire vld_buf1_ff_scanout; wire vld_buf1; wire data_buf1_ff_scanin; wire data_buf1_ff_scanout; wire [3:0] data_buf1; wire skid_buf0_sel; wire skid_buf1_sel_ff_scanin; wire skid_buf1_sel_ff_scanout; wire skid_buf1_sel; wire vld_mux; wire [3:0] data_mux; wire [31:0] indata_vec_next; wire [31:0] indata_vec; wire iob_ucb_stall_a1_; wire indata_vec_ff_scanin; wire indata_vec_ff_scanout; wire [127:0] indata_buf_next; wire [127:0] indata_buf; wire indata_buf_ff_scanin; wire indata_buf_ff_scanout; wire indata_vec0_d1_ff_scanin; wire indata_vec0_d1_ff_scanout; wire indata_vec0_d1; wire indata_buf_vld; wire req_ack_pending; wire req_ack_dbl_buf_full; wire wr_req_ack_dbl_buf; wire wr_buf0; wire buf1_vld; wire buf0_vld; wire buf1_older; wire wr_buf1; wire rd_buf0; wire rd_buf1; wire rd_buf; wire buf1_older_n; wire buf1_older_ff_scanin; wire buf1_older_ff_scanout; wire en_vld0; wire en_vld1; wire buf0_vld_ff_scanin; wire buf0_vld_ff_scanout; wire buf1_vld_ff_scanin; wire buf1_vld_ff_scanout; wire buf0_obj_ff_scanin; wire buf0_obj_ff_scanout; wire [127:0] buf0_obj; wire buf1_obj_ff_scanin; wire buf1_obj_ff_scanout; wire [127:0] buf1_obj; wire siclk; wire soclk; wire se; wire pce_ov; wire stop; //////////////////////////////////////////////////////////////////////// // Signal declarations //////////////////////////////////////////////////////////////////////// // Global interface input iol2clk; input scan_in; output scan_out; input tcu_pce_ov; input tcu_clk_stop; input tcu_scan_en; input tcu_aclk; input tcu_bclk; // UCB interface input ucb_iob_vld; input [3:0] ucb_iob_data; output iob_ucb_stall; // i2c slow control/datapath interface output [127:0] req_ack_obj; output req_ack_vld; input rd_req_ack_dbl_buf; // Internal signals /************************************************************ * Assemble inbound packet ************************************************************/ // ucb_bus_in #(UCB_BUS_WIDTH) ucb_bus_in // ( // .clk(iol2clk), // .vld(ucb_iob_vld), // .data(ucb_iob_data[UCB_BUS_WIDTH-1:0]), // .stall(iob_ucb_stall), // .indata_buf_vld(indata_buf_vld), // .indata_buf(indata_buf[127:0]), // .stall_a1(iob_ucb_stall_a1) // ); //============================================================= //============================================================= //============================================================= /************************************************************ * UCB bus interface flops * This is to make signals going between IOB and UCB flop-to-flop * to improve timing. ************************************************************/ assign stall_d1_n = ~stall_d1; ncu_i2cbuf4_ni_ctl_msff_ctl_macro__en_1__width_1 vld_d1_ff ( .scan_in(vld_d1_ff_scanin), .scan_out(vld_d1_ff_scanout), .dout (vld_d1), .l1clk (l1clk), .en (stall_d1_n&rdy1), .din (ucb_iob_vld), .siclk(siclk), .soclk(soclk) ); ncu_i2cbuf4_ni_ctl_msff_ctl_macro__en_1__width_4 data_d1_ff ( .scan_in(data_d1_ff_scanin), .scan_out(data_d1_ff_scanout), .dout (data_d1[3:0]), .l1clk (l1clk), .en (stall_d1_n), .din (ucb_iob_data[3:0]), .siclk(siclk), .soclk(soclk) ); ncu_i2cbuf4_ni_ctl_msff_ctl_macro__width_1 stall_ff ( .scan_in(stall_ff_scanin), .scan_out(stall_ff_scanout), .dout (iob_ucb_stall), .l1clk (l1clk), .din (iob_ucb_stall_a1), .siclk(siclk), .soclk(soclk) ); ncu_i2cbuf4_ni_ctl_msff_ctl_macro__width_1 stall_d1_ff ( .scan_in(stall_d1_ff_scanin), .scan_out(stall_d1_ff_scanout), .dout (stall_d1), .l1clk (l1clk), .din (iob_ucb_stall), .siclk(siclk), .soclk(soclk) ); ncu_i2cbuf4_ni_ctl_msff_ctl_macro__width_1 rdy0_ff ( .scan_in(rdy0_ff_scanin), .scan_out(rdy0_ff_scanout), .dout (rdy0), .l1clk (l1clk), .din (1'b1), .siclk(siclk), .soclk(soclk) ); ncu_i2cbuf4_ni_ctl_msff_ctl_macro__width_1 rdy1_ff ( .scan_in(rdy1_ff_scanin), .scan_out(rdy1_ff_scanout), .dout (rdy1), .l1clk (l1clk), .din (rdy0), .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 = iob_ucb_stall_a1 & ~iob_ucb_stall; ncu_i2cbuf4_ni_ctl_msff_ctl_macro__en_1__width_1 vld_buf0_ff ( .scan_in(vld_buf0_ff_scanin), .scan_out(vld_buf0_ff_scanout), .dout (vld_buf0), .l1clk (l1clk), .en (skid_buf0_en), .din (vld_d1), .siclk(siclk), .soclk(soclk) ); ncu_i2cbuf4_ni_ctl_msff_ctl_macro__en_1__width_4 data_buf0_ff ( .scan_in(data_buf0_ff_scanin), .scan_out(data_buf0_ff_scanout), .dout (data_buf0[3:0]), .l1clk (l1clk), .en (skid_buf0_en), .din (data_d1[3:0]), .siclk(siclk), .soclk(soclk) ); // Buffer 1 ncu_i2cbuf4_ni_ctl_msff_ctl_macro__width_1 skid_buf1_en_ff ( .scan_in(skid_buf1_en_ff_scanin), .scan_out(skid_buf1_en_ff_scanout), .dout (skid_buf1_en), .l1clk (l1clk), .din (skid_buf0_en), .siclk(siclk), .soclk(soclk) ); ncu_i2cbuf4_ni_ctl_msff_ctl_macro__en_1__width_1 vld_buf1_ff ( .scan_in(vld_buf1_ff_scanin), .scan_out(vld_buf1_ff_scanout), .dout (vld_buf1), .l1clk (l1clk), .en (skid_buf1_en), .din (vld_d1), .siclk(siclk), .soclk(soclk) ); ncu_i2cbuf4_ni_ctl_msff_ctl_macro__en_1__width_4 data_buf1_ff ( .scan_in(data_buf1_ff_scanin), .scan_out(data_buf1_ff_scanout), .dout (data_buf1[3:0]), .l1clk (l1clk), .en (skid_buf1_en), .din (data_d1[3:0]), .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 = ~iob_ucb_stall_a1 & iob_ucb_stall; ncu_i2cbuf4_ni_ctl_msff_ctl_macro__width_1 skid_buf1_sel_ff ( .scan_in(skid_buf1_sel_ff_scanin), .scan_out(skid_buf1_sel_ff_scanout), .dout (skid_buf1_sel), .l1clk (l1clk), .din (skid_buf0_sel), .siclk(siclk), .soclk(soclk) ); assign vld_mux = skid_buf0_sel ? vld_buf0 : skid_buf1_sel ? vld_buf1 : vld_d1; assign data_mux[3:0] = skid_buf0_sel ? data_buf0[3:0] : skid_buf1_sel ? data_buf1[3:0] : data_d1[3:0]; /************************************************************ * Assemble inbound data ************************************************************/ // valid vector assign indata_vec_next[31:0] = {vld_mux, indata_vec[31:1]}; assign iob_ucb_stall_a1_= ~iob_ucb_stall_a1; ncu_i2cbuf4_ni_ctl_msff_ctl_macro__en_1__width_32 indata_vec_ff ( .scan_in(indata_vec_ff_scanin), .scan_out(indata_vec_ff_scanout), .dout (indata_vec[31:0]), .l1clk (l1clk), .en (iob_ucb_stall_a1_), .din (indata_vec_next[31:0]), .siclk(siclk), .soclk(soclk) ); // data buffer assign indata_buf_next[127:0] = {data_mux[3:0], indata_buf[127:4]}; ncu_i2cbuf4_ni_ctl_msff_ctl_macro__en_1__width_128 indata_buf_ff ( .scan_in(indata_buf_ff_scanin), .scan_out(indata_buf_ff_scanout), .dout (indata_buf[127:0]), .l1clk (l1clk), .en (iob_ucb_stall_a1_), .din (indata_buf_next[127:0]), .siclk(siclk), .soclk(soclk) ); // detect a new packet ncu_i2cbuf4_ni_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), .dout (indata_vec0_d1), .l1clk (l1clk), .en (iob_ucb_stall_a1_), .din (indata_vec[0]), .siclk(siclk), .soclk(soclk) ); assign indata_buf_vld = indata_vec[0] & ~indata_vec0_d1; //============================================================= //============================================================= //============================================================= /************************************************************ * Decode inbound packet type ************************************************************/ // non-interrupt packet assign req_ack_pending = indata_buf_vld; assign iob_ucb_stall_a1 = (req_ack_pending & req_ack_dbl_buf_full); /************************************************************ * Double buffer to store non-interrupt packets ************************************************************/ assign wr_req_ack_dbl_buf = req_ack_pending & ~req_ack_dbl_buf_full; // dbl_buf #(128) req_ack_dbl_buf ( // .clk(iol2clk), // .wr(wr_req_ack_dbl_buf), // .din(indata_buf[127:0]), // .rd(rd_req_ack_dbl_buf), // .dout(req_ack_obj[127:0]), // .vld(req_ack_vld), // .full(req_ack_dbl_buf_full)); //============================================================= //============================================================= //============================================================= // if both entries are empty, write to entry pointed to by the older pointer assign wr_buf0 = wr_req_ack_dbl_buf & (buf1_vld | (~buf0_vld & ~buf1_older)); assign wr_buf1 = wr_req_ack_dbl_buf & (buf0_vld | (~buf1_vld & buf1_older)); // read from the older entry assign rd_buf0 = rd_req_ack_dbl_buf & ~buf1_older; assign rd_buf1 = rd_req_ack_dbl_buf & buf1_older; // flip older pointer when an entry is read assign rd_buf = rd_req_ack_dbl_buf & (buf0_vld | buf1_vld); assign buf1_older_n = ~buf1_older ; ncu_i2cbuf4_ni_ctl_msff_ctl_macro__en_1__width_1 buf1_older_ff ( .scan_in(buf1_older_ff_scanin), .scan_out(buf1_older_ff_scanout), .dout (buf1_older), .l1clk (l1clk), .en (rd_buf), .din (buf1_older_n), .siclk(siclk), .soclk(soclk) ); // set valid bit for writes and reset for reads assign en_vld0 = wr_buf0 | rd_buf0; assign en_vld1 = wr_buf1 | rd_buf1; // the actual buffers ncu_i2cbuf4_ni_ctl_msff_ctl_macro__en_1__width_1 buf0_vld_ff ( .scan_in(buf0_vld_ff_scanin), .scan_out(buf0_vld_ff_scanout), .dout (buf0_vld), .l1clk (l1clk), .en (en_vld0), .din (wr_buf0), .siclk(siclk), .soclk(soclk) ); ncu_i2cbuf4_ni_ctl_msff_ctl_macro__en_1__width_1 buf1_vld_ff ( .scan_in(buf1_vld_ff_scanin), .scan_out(buf1_vld_ff_scanout), .dout (buf1_vld), .l1clk (l1clk), .en (en_vld1), .din (wr_buf1), .siclk(siclk), .soclk(soclk) ); ncu_i2cbuf4_ni_ctl_msff_ctl_macro__en_1__width_128 buf0_obj_ff ( .scan_in(buf0_obj_ff_scanin), .scan_out(buf0_obj_ff_scanout), .dout (buf0_obj[127:0]), .l1clk (l1clk), .en (wr_buf0), .din (indata_buf[127:0]), .siclk(siclk), .soclk(soclk) ); ncu_i2cbuf4_ni_ctl_msff_ctl_macro__en_1__width_128 buf1_obj_ff ( .scan_in(buf1_obj_ff_scanin), .scan_out(buf1_obj_ff_scanout), .dout (buf1_obj[127:0]), .l1clk (l1clk), .en (wr_buf1), .din (indata_buf[127:0]), .siclk(siclk), .soclk(soclk) ); // mux out the older entry assign req_ack_obj[127:0] = (buf1_older) ? buf1_obj[127:0] : buf0_obj[127:0] ; assign req_ack_vld = buf0_vld | buf1_vld; assign req_ack_dbl_buf_full = buf0_vld & buf1_vld; //============================================================= //============================================================= //============================================================= /**** adding clock header ****/ ncu_i2cbuf4_ni_ctl_l1clkhdr_ctl_macro clkgen ( .l2clk (iol2clk), .l1en (1'b1), .l1clk (l1clk), .pce_ov(pce_ov), .stop(stop), .se(se) ); /*** building tcu port ***/ assign siclk = tcu_aclk; assign soclk = tcu_bclk; assign se = tcu_scan_en; assign pce_ov = tcu_pce_ov; assign stop = tcu_clk_stop; // 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 rdy0_ff_scanin = stall_d1_ff_scanout ; assign rdy1_ff_scanin = rdy0_ff_scanout ; assign vld_buf0_ff_scanin = rdy1_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 buf1_older_ff_scanin = indata_vec0_d1_ff_scanout; assign buf0_vld_ff_scanin = buf1_older_ff_scanout ; assign buf1_vld_ff_scanin = buf0_vld_ff_scanout ; assign buf0_obj_ff_scanin = buf1_vld_ff_scanout ; assign buf1_obj_ff_scanin = buf0_obj_ff_scanout ; assign scan_out = buf1_obj_ff_scanout ; // fixscan end: endmodule // i2c_buf // any PARAMS parms go into naming of macro module ncu_i2cbuf4_ni_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 ncu_i2cbuf4_ni_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 ncu_i2cbuf4_ni_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 ncu_i2cbuf4_ni_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 ncu_i2cbuf4_ni_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 // any PARAMS parms go into naming of macro module ncu_i2cbuf4_ni_ctl_l1clkhdr_ctl_macro ( l2clk, l1en, pce_ov, stop, se, l1clk); input l2clk; input l1en; input pce_ov; input stop; input se; output l1clk; cl_sc1_l1hdr_8x c_0 ( .l2clk(l2clk), .pce(l1en), .l1clk(l1clk), .se(se), .pce_ov(pce_ov), .stop(stop) ); endmodule