diff options
Diffstat (limited to 'fpga/usrp2/models/DCM_SP.v')
| -rw-r--r-- | fpga/usrp2/models/DCM_SP.v | 1244 |
1 files changed, 1244 insertions, 0 deletions
diff --git a/fpga/usrp2/models/DCM_SP.v b/fpga/usrp2/models/DCM_SP.v new file mode 100644 index 000000000..2142fa736 --- /dev/null +++ b/fpga/usrp2/models/DCM_SP.v @@ -0,0 +1,1244 @@ +// $Header: /devl/xcs/repo/env/Databases/CAEInterfaces/verunilibs/data/unisims/DCM_SP.v,v 1.9.4.3 2007/04/11 20:30:19 yanx Exp $ +/////////////////////////////////////////////////////////////////////////////// +// Copyright (c) 1995/2004 Xilinx, Inc. +// All Right Reserved. +/////////////////////////////////////////////////////////////////////////////// +// ____ ____ +// / /\/ / +// /___/ \ / Vendor : Xilinx +// \ \ \/ Version : 9.2i (J.36) +// \ \ Description : Xilinx Function Simulation Library Component +// / / Digital Clock Manager +// /___/ /\ Filename : DCM_SP.v +// \ \ / \ Timestamp : +// \___\/\___\ +// +// Revision: +// 02/28/06 - Initial version. +// 05/09/06 - Add clkin_ps_mkup and clkin_ps_mkup_win for phase shifting (CR 229789). +// 06/14/06 - Add clkin_ps_mkup_flag for multiple cycle delays (CR233283). +// 07/21/06 - Change range of variable phase shifting to +/- integer of 20*(Period-3ns). +// Give warning not support initial phase shifting for variable phase shifting. +// (CR 235216). +// 09/22/06 - Add lock_period and lock_fb to clkfb_div block (CR 418722). +// 12/19/06 - Add clkfb_div_en for clkfb2x divider (CR431210). +// 04/06/07 - Enable the clock out in clock low time after reset in model +// clock_divide_by_2 (CR 437471). +// End Revision + + +`timescale 1 ps / 1 ps + +module DCM_SP ( + CLK0, CLK180, CLK270, CLK2X, CLK2X180, CLK90, + CLKDV, CLKFX, CLKFX180, LOCKED, PSDONE, STATUS, + CLKFB, CLKIN, DSSEN, PSCLK, PSEN, PSINCDEC, RST); + +parameter CLKDV_DIVIDE = 2.0; +parameter integer CLKFX_DIVIDE = 1; +parameter integer CLKFX_MULTIPLY = 4; +parameter CLKIN_DIVIDE_BY_2 = "FALSE"; +parameter CLKIN_PERIOD = 10.0; // non-simulatable +parameter CLKOUT_PHASE_SHIFT = "NONE"; +parameter CLK_FEEDBACK = "1X"; +parameter DESKEW_ADJUST = "SYSTEM_SYNCHRONOUS"; // non-simulatable +parameter DFS_FREQUENCY_MODE = "LOW"; +parameter DLL_FREQUENCY_MODE = "LOW"; +parameter DSS_MODE = "NONE"; // non-simulatable +parameter DUTY_CYCLE_CORRECTION = "TRUE"; +parameter FACTORY_JF = 16'hC080; // non-simulatable +parameter integer MAXPERCLKIN = 1000000; // non-modifiable simulation parameter +parameter integer MAXPERPSCLK = 100000000; // non-modifiable simulation parameter +parameter integer PHASE_SHIFT = 0; +parameter integer SIM_CLKIN_CYCLE_JITTER = 300; // non-modifiable simulation parameter +parameter integer SIM_CLKIN_PERIOD_JITTER = 1000; // non-modifiable simulation parameter +parameter STARTUP_WAIT = "FALSE"; // non-simulatable + + +localparam PS_STEP = 25; + +input CLKFB, CLKIN, DSSEN; +input PSCLK, PSEN, PSINCDEC, RST; + +output CLK0, CLK180, CLK270, CLK2X, CLK2X180, CLK90; +output CLKDV, CLKFX, CLKFX180, LOCKED, PSDONE; +output [7:0] STATUS; + +reg CLK0, CLK180, CLK270, CLK2X, CLK2X180, CLK90; +reg CLKDV, CLKFX, CLKFX180; + +wire locked_out_out; +wire clkfb_in, clkin_in, dssen_in; +wire psclk_in, psen_in, psincdec_in, rst_in; +reg clk0_out; +reg clk2x_out, clkdv_out; +reg clkfx_out, clkfx180_en; +reg rst_flag; +reg locked_out, psdone_out, ps_overflow_out, ps_lock; +reg clkfb_div, clkfb_chk, clkfb_div_en; +integer clkdv_cnt; + +reg [1:0] clkfb_type; +reg [8:0] divide_type; +reg clkin_type; +reg [1:0] ps_type; +reg [3:0] deskew_adjust_mode; +reg dfs_mode_type; +reg dll_mode_type; +reg clk1x_type; +integer ps_in; + +reg lock_period, lock_delay, lock_clkin, lock_clkfb; +reg first_time_locked; +reg en_status; +reg ps_overflow_out_ext; +reg clkin_lost_out_ext; +reg clkfx_lost_out_ext; +reg [1:0] lock_out; +reg lock_out1_neg; +reg lock_fb, lock_ps, lock_ps_dly, lock_fb_dly, lock_fb_dly_tmp; +reg fb_delay_found; +reg clock_stopped; +reg clkin_chkin, clkfb_chkin; + +wire chk_enable, chk_rst; +wire clkin_div; +wire lock_period_pulse; +wire lock_period_dly, lock_period_dly1; + +reg clkin_ps, clkin_ps_tmp, clkin_ps_mkup, clkin_ps_mkup_win, clkin_ps_mkup_flag; +reg clkin_fb; + +time FINE_SHIFT_RANGE; +//time ps_delay, ps_delay_init, ps_delay_md, ps_delay_all, ps_max_range; +integer ps_delay, ps_delay_init, ps_delay_md, ps_delay_all, ps_max_range; +integer ps_delay_last; +integer ps_acc; +time clkin_edge; +time clkin_div_edge; +time clkin_ps_edge; +time delay_edge; +time clkin_period [2:0]; +time period; +integer period_int, period_int2, period_int3, period_ps_tmp; +time period_div; +integer period_orig_int; +time period_orig; +time period_ps; +time clkout_delay; +time fb_delay; +time period_fx, remain_fx; +time period_dv_high, period_dv_low; +time cycle_jitter, period_jitter; + +reg clkin_window, clkfb_window; +reg [2:0] rst_reg; +reg [12:0] numerator, denominator, gcd; +reg [23:0] i, n, d, p; + +reg notifier; + +initial begin + #1; + if ($realtime == 0) begin + $display ("Simulator Resolution Error : Simulator resolution is set to a value greater than 1 ps."); + $display ("In order to simulate the DCM_SP, the simulator resolution must be set to 1ps or smaller."); + $finish; + end +end + +initial begin + case (2.0) + 1.5 : divide_type = 'd3; + 2.0 : divide_type = 'd4; + 2.5 : divide_type = 'd5; + 3.0 : divide_type = 'd6; + 3.5 : divide_type = 'd7; + 4.0 : divide_type = 'd8; + 4.5 : divide_type = 'd9; + 5.0 : divide_type = 'd10; + 5.5 : divide_type = 'd11; + 6.0 : divide_type = 'd12; + 6.5 : divide_type = 'd13; + 7.0 : divide_type = 'd14; + 7.5 : divide_type = 'd15; + 8.0 : divide_type = 'd16; + 9.0 : divide_type = 'd18; + 10.0 : divide_type = 'd20; + 11.0 : divide_type = 'd22; + 12.0 : divide_type = 'd24; + 13.0 : divide_type = 'd26; + 14.0 : divide_type = 'd28; + 15.0 : divide_type = 'd30; + 16.0 : divide_type = 'd32; + default : begin + $display("Attribute Syntax Error : The attribute CLKDV_DIVIDE on DCM_SP instance %m is set to %0.1f. Legal values for this attribute are 1.5, 2.0, 2.5, 3.0, 3.5, 4.0, 4.5, 5.0, 5.5, 6.0, 6.5, 7.0, 7.5, 8.0, 9.0, 10.0, 11.0, 12.0, 13.0, 14.0, 15.0, or 16.0.", CLKDV_DIVIDE); + $finish; + end + endcase + + if ((CLKFX_DIVIDE <= 0) || (32 < CLKFX_DIVIDE)) begin + $display("Attribute Syntax Error : The attribute CLKFX_DIVIDE on DCM_SP instance %m is set to %d. Legal values for this attribute are 1 ... 32.", CLKFX_DIVIDE); + $finish; + end + + if ((CLKFX_MULTIPLY <= 1) || (32 < CLKFX_MULTIPLY)) begin + $display("Attribute Syntax Error : The attribute CLKFX_MULTIPLY on DCM_SP instance %m is set to %d. Legal values for this attribute are 2 ... 32.", CLKFX_MULTIPLY); + $finish; + end + + case (CLKIN_DIVIDE_BY_2) + "false" : clkin_type = 0; + "FALSE" : clkin_type = 0; + "true" : clkin_type = 1; + "TRUE" : clkin_type = 1; + default : begin + $display("Attribute Syntax Error : The attribute CLKIN_DIVIDE_BY_2 on DCM_SP instance %m is set to %s. Legal values for this attribute are TRUE or FALSE.", CLKIN_DIVIDE_BY_2); + $finish; + end + endcase + + case (CLKOUT_PHASE_SHIFT) + "NONE" : begin + ps_in = 256; + ps_type = 0; + end + "none" : begin + ps_in = 256; + ps_type = 0; + end + "FIXED" : begin + ps_in = PHASE_SHIFT + 256; + ps_type = 1; + end + "fixed" : begin + ps_in = PHASE_SHIFT + 256; + ps_type = 1; + end + "VARIABLE" : begin + ps_in = PHASE_SHIFT + 256; + ps_type = 2; + end + "variable" : begin + ps_in = PHASE_SHIFT + 256; + ps_type = 2; + if (PHASE_SHIFT != 0) + $display("Attribute Syntax Warning : The attribute PHASE_SHIFT on DCM_SP instance %m is set to %d. The maximum variable phase shift range is only valid when initial phase shift PHASE_SHIFT is zero.", PHASE_SHIFT); + end + default : begin + $display("Attribute Syntax Error : The attribute CLKOUT_PHASE_SHIFT on DCM_SP instance %m is set to %s. Legal values for this attribute are NONE, FIXED or VARIABLE.", CLKOUT_PHASE_SHIFT); + $finish; + end + endcase + + + case (CLK_FEEDBACK) + "none" : clkfb_type = 2'b00; + "NONE" : clkfb_type = 2'b00; + "1x" : clkfb_type = 2'b01; + "1X" : clkfb_type = 2'b01; + "2x" : clkfb_type = 2'b10; + "2X" : clkfb_type = 2'b10; + default : begin + $display("Attribute Syntax Error : The attribute CLK_FEEDBACK on DCM_SP instance %m is set to %s. Legal values for this attribute are NONE, 1X or 2X.", CLK_FEEDBACK); + $finish; + end + endcase + + case (DESKEW_ADJUST) + "source_synchronous" : deskew_adjust_mode = 8; + "SOURCE_SYNCHRONOUS" : deskew_adjust_mode = 8; + "system_synchronous" : deskew_adjust_mode = 11; + "SYSTEM_SYNCHRONOUS" : deskew_adjust_mode = 11; + "0" : deskew_adjust_mode = 0; + "1" : deskew_adjust_mode = 1; + "2" : deskew_adjust_mode = 2; + "3" : deskew_adjust_mode = 3; + "4" : deskew_adjust_mode = 4; + "5" : deskew_adjust_mode = 5; + "6" : deskew_adjust_mode = 6; + "7" : deskew_adjust_mode = 7; + "8" : deskew_adjust_mode = 8; + "9" : deskew_adjust_mode = 9; + "10" : deskew_adjust_mode = 10; + "11" : deskew_adjust_mode = 11; + "12" : deskew_adjust_mode = 12; + "13" : deskew_adjust_mode = 13; + "14" : deskew_adjust_mode = 14; + "15" : deskew_adjust_mode = 15; + default : begin + $display("Attribute Syntax Error : The attribute DESKEW_ADJUST on DCM_SP instance %m is set to %s. Legal values for this attribute are SOURCE_SYNCHRONOUS, SYSTEM_SYNCHRONOUS or 0 ... 15.", DESKEW_ADJUST); + $finish; + end + endcase + + case (DFS_FREQUENCY_MODE) + "high" : dfs_mode_type = 1; + "HIGH" : dfs_mode_type = 1; + "low" : dfs_mode_type = 0; + "LOW" : dfs_mode_type = 0; + default : begin + $display("Attribute Syntax Error : The attribute DFS_FREQUENCY_MODE on DCM_SP instance %m is set to %s. Legal values for this attribute are HIGH or LOW.", DFS_FREQUENCY_MODE); + $finish; + end + endcase + + period_jitter = SIM_CLKIN_PERIOD_JITTER; + cycle_jitter = SIM_CLKIN_CYCLE_JITTER; + + case (DLL_FREQUENCY_MODE) + "high" : dll_mode_type = 1; + "HIGH" : dll_mode_type = 1; + "low" : dll_mode_type = 0; + "LOW" : dll_mode_type = 0; + default : begin + $display("Attribute Syntax Error : The attribute DLL_FREQUENCY_MODE on DCM_SP instance %m is set to %s. Legal values for this attribute are HIGH or LOW.", DLL_FREQUENCY_MODE); + $finish; + end + endcase + + if ((dll_mode_type ==1) && (clkfb_type == 2'b10)) begin + $display("Attribute Syntax Error : The attributes DLL_FREQUENCY_MODE on DCM_SP instance %m is set to %s and CLK_FEEDBACK is set to %s. CLK_FEEDBACK 2X is not supported when DLL_FREQUENCY_MODE is HIGH.", DLL_FREQUENCY_MODE, CLK_FEEDBACK); + $finish; + end + + case (DSS_MODE) + "none" : ; + "NONE" : ; + default : begin + $display("Attribute Syntax Error : The attribute DSS_MODE on DCM_SP instance %m is set to %s. Legal values for this attribute is NONE.", DSS_MODE); + $finish; + end + endcase + + case (DUTY_CYCLE_CORRECTION) + "false" : clk1x_type = 0; + "FALSE" : clk1x_type = 0; + "true" : clk1x_type = 1; + "TRUE" : clk1x_type = 1; + default : begin + $display("Attribute Syntax Error : The attribute DUTY_CYCLE_CORRECTION on DCM_SP instance %m is set to %s. Legal values for this attribute are TRUE or FALSE.", DUTY_CYCLE_CORRECTION); + $finish; + end + endcase + + if ((PHASE_SHIFT < -255) || (PHASE_SHIFT > 255)) begin + $display("Attribute Syntax Error : The attribute PHASE_SHIFT on DCM_SP instance %m is set to %d. Legal values for this attribute are -255 ... 255.", PHASE_SHIFT); + $display("Error : PHASE_SHIFT = %d is not -255 ... 255.", PHASE_SHIFT); + $finish; + end + + case (STARTUP_WAIT) + "false" : ; + "FALSE" : ; + "true" : ; + "TRUE" : ; + default : begin + $display("Attribute Syntax Error : The attribute STARTUP_WAIT on DCM_SP instance %m is set to %s. Legal values for this attribute are TRUE or FALSE.", STARTUP_WAIT); + $finish; + end + endcase +end + +// +// fx parameters +// + +initial begin + gcd = 1; + for (i = 2; i <= CLKFX_MULTIPLY; i = i + 1) begin + if (((CLKFX_MULTIPLY % i) == 0) && ((CLKFX_DIVIDE % i) == 0)) + gcd = i; + end + numerator = CLKFX_MULTIPLY / gcd; + denominator = CLKFX_DIVIDE / gcd; +end + +// +// input wire delays +// + +buf b_clkin (clkin_in, CLKIN); +buf b_clkfb (clkfb_in, CLKFB); +buf b_dssen (dssen_in, DSSEN); +buf b_psclk (psclk_in, PSCLK); +buf b_psen (psen_in, PSEN); +buf b_psincdec (psincdec_in, PSINCDEC); +buf b_rst (rst_in, RST); +buf #100 b_LOCKED (LOCKED, locked_out_out); +buf #100 b_PSDONE (PSDONE, psdone_out); +buf b_ps_overflow (STATUS[0], ps_overflow_out_ext); +buf b_clkin_lost (STATUS[1], clkin_lost_out_ext); +buf b_clkfx_lost (STATUS[2], clkfx_lost_out_ext); + +assign STATUS[7:3] = 5'b0; + +dcm_sp_clock_divide_by_2 i_clock_divide_by_2 (clkin_in, clkin_type, clkin_div, rst_in); + +dcm_sp_maximum_period_check #("CLKIN", MAXPERCLKIN) i_max_clkin (clkin_in, rst_in); +dcm_sp_maximum_period_check #("PSCLK", MAXPERPSCLK) i_max_psclk (psclk_in, rst_in); + +dcm_sp_clock_lost i_clkin_lost (clkin_in, first_time_locked, clkin_lost_out, rst_in); +dcm_sp_clock_lost i_clkfx_lost (CLKFX, first_time_locked, clkfx_lost_out, rst_in); + +always @(rst_in or en_status or clkfx_lost_out or clkin_lost_out or ps_overflow_out) + if (rst_in == 1 || en_status == 0) begin + ps_overflow_out_ext = 0; + clkin_lost_out_ext = 0; + clkfx_lost_out_ext = 0; + end + else + begin + ps_overflow_out_ext = ps_overflow_out; + clkin_lost_out_ext = clkin_lost_out; + clkfx_lost_out_ext = clkfx_lost_out; + end + +always @(posedge rst_in or posedge LOCKED) + if (rst_in == 1) + en_status <= 0; + else + en_status <= 1; + + +always @(clkin_div) + clkin_ps_tmp <= #(ps_delay_md) clkin_div; + +always @(clkin_ps_tmp or clkin_ps_mkup or clkin_ps_mkup_win) + if (clkin_ps_mkup_win) + clkin_ps = clkin_ps_mkup; + else + clkin_ps = clkin_ps_tmp; + +always @(ps_delay_last or period_int or ps_delay) begin + period_int2 = 2 * period_int; + period_int3 = 3 * period_int; + if ((ps_delay_last >= period_int && ps_delay < period_int) || + (ps_delay_last >= period_int2 && ps_delay < period_int2) || + (ps_delay_last >= period_int3 && ps_delay < period_int3)) + clkin_ps_mkup_flag = 1; + else + clkin_ps_mkup_flag = 0; +end + +always @(posedge clkin_div or negedge clkin_div) begin + if (ps_type == 2'b10) begin + if ((ps_delay_last > 0 && ps_delay <= 0 ) || clkin_ps_mkup_flag == 1) begin + if (clkin_div) begin + clkin_ps_mkup_win <= 1; + clkin_ps_mkup <= 1; + #1; + @(negedge clkin_div) begin + clkin_ps_mkup_win <= 1; + clkin_ps_mkup <= 0; + end + end + else begin + clkin_ps_mkup_win <= 0; + clkin_ps_mkup <= 0; + #1; + @(posedge clkin_div) begin + clkin_ps_mkup_win <= 1; + clkin_ps_mkup <= 1; + end + @(negedge clkin_div) begin + clkin_ps_mkup_win <= 1; + clkin_ps_mkup <= 0; + end + end + end + else begin + clkin_ps_mkup_win <= 0; + clkin_ps_mkup <= 0; + end + ps_delay_last <= ps_delay; + end +end + +always @(clkin_ps or lock_fb) + clkin_fb = clkin_ps & lock_fb; + +always @(negedge clkfb_in or posedge rst_in) + if (rst_in) + clkfb_div_en <= 0; + else + if (lock_fb_dly && lock_period && lock_fb && ~clkin_ps) + clkfb_div_en <= 1; + +always @(posedge clkfb_in or posedge rst_in) + if (rst_in) + clkfb_div <= 0; + else + if (clkfb_div_en ) + clkfb_div <= ~clkfb_div; + +always @(clkfb_in or clkfb_div ) + if (clkfb_type == 2'b10 ) + clkfb_chk = clkfb_div; + else + clkfb_chk = clkfb_in & lock_fb_dly; + +always @(posedge clkin_fb or posedge chk_rst) + if (chk_rst) + clkin_chkin <= 0; + else + clkin_chkin <= 1; + +always @(posedge clkfb_chk or posedge chk_rst) + if (chk_rst) + clkfb_chkin <= 0; + else + clkfb_chkin <= 1; + + assign chk_rst = (rst_in==1 || clock_stopped==1 ) ? 1 : 0; + assign chk_enable = (clkin_chkin == 1 && clkfb_chkin == 1 && + lock_ps ==1 && lock_fb ==1 && lock_fb_dly == 1) ? 1 : 0; + +always @(posedge clkin_div or posedge rst_in) + if (rst_in) begin + period_div <= 0; + clkin_div_edge <= 0; + end + else + if ( clkin_div ==1 ) begin + clkin_div_edge <= $time; + if (($time - clkin_div_edge) <= (1.5 * period_div)) + period_div <= $time - clkin_div_edge; + else if ((period_div == 0) && (clkin_div_edge != 0)) + period_div <= $time - clkin_div_edge; + end + +always @(posedge clkin_ps or posedge rst_in) + if (rst_in) begin + period_ps <= 0; + clkin_ps_edge <= 0; + end + else + if (clkin_ps == 1 ) begin + clkin_ps_edge <= $time; + if (($time - clkin_ps_edge) <= (1.5 * period_ps)) + period_ps <= $time - clkin_ps_edge; + else if ((period_ps == 0) && (clkin_ps_edge != 0)) + period_ps <= $time - clkin_ps_edge; + end + +always @(posedge clkin_ps) begin + lock_ps <= lock_period; + lock_ps_dly <= lock_ps; + lock_fb <= lock_ps_dly; + lock_fb_dly_tmp <= lock_fb; +end + +always @(negedge clkin_ps or posedge rst_in) + if (rst_in) + lock_fb_dly <= 1'b0; + else + lock_fb_dly <= #(period/4) lock_fb_dly_tmp; + + +always @(period or fb_delay ) + if (fb_delay == 0) + clkout_delay = 0; + else + clkout_delay = period - fb_delay; + +// +// generate master reset signal +// + +always @(posedge clkin_in) begin + rst_reg[0] <= rst_in; + rst_reg[1] <= rst_reg[0] & rst_in; + rst_reg[2] <= rst_reg[1] & rst_reg[0] & rst_in; +end + +reg rst_tmp1, rst_tmp2; +initial +begin +rst_tmp1 = 0; +rst_tmp2 = 0; +rst_flag = 0; +end + +always @(rst_in) +begin + if (rst_in) + rst_flag = 0; + + rst_tmp1 = rst_in; + if (rst_tmp1 == 0 && rst_tmp2 == 1) begin + if ((rst_reg[2] & rst_reg[1] & rst_reg[0]) == 0) begin + rst_flag = 1; + $display("Input Error : RST on instance %m must be asserted for 3 CLKIN clock cycles."); + end + end + rst_tmp2 = rst_tmp1; +end + +initial begin + CLK0 = 0; + CLK180 = 0; + CLK270 = 0; + CLK2X = 0; + CLK2X180 = 0; + CLK90 = 0; + CLKDV = 0; + CLKFX = 0; + CLKFX180 = 0; + clk0_out = 0; + clk2x_out = 0; + clkdv_out = 0; + clkdv_cnt = 0; + clkfb_window = 0; + clkfx_out = 0; + clkfx180_en = 0; + clkin_div_edge = 0; + clkin_period[0] = 0; + clkin_period[1] = 0; + clkin_period[2] = 0; + clkin_edge = 0; + clkin_ps_edge = 0; + clkin_window = 0; + clkout_delay = 0; + clock_stopped = 1; + fb_delay = 0; + fb_delay_found = 0; + lock_clkfb = 0; + lock_clkin = 0; + lock_delay = 0; + lock_fb = 0; + lock_fb_dly = 0; + lock_out = 2'b00; + lock_out1_neg = 0; + lock_period = 0; + lock_ps = 0; + lock_ps_dly = 0; + locked_out = 0; + period = 0; + period_int = 0; + period_int2 = 0; + period_int3 = 0; + period_div = 0; + period_fx = 0; + period_orig = 0; + period_orig_int = 0; + period_ps = 0; + psdone_out = 0; + ps_delay = 0; + ps_delay_md = 0; + ps_delay_init = 0; + ps_acc = 0; + ps_delay_all = 0; + ps_lock = 0; + ps_overflow_out = 0; + ps_overflow_out_ext = 0; + clkin_lost_out_ext = 0; + clkfx_lost_out_ext = 0; + rst_reg = 3'b000; + first_time_locked = 0; + en_status = 0; + clkfb_div = 0; + clkin_chkin = 0; + clkfb_chkin = 0; + clkin_ps_mkup = 0; + clkin_ps_mkup_win = 0; + clkin_ps_mkup_flag = 0; + ps_delay_last = 0; + clkin_ps_tmp = 0; +end + +// RST less than 3 cycles, lock = x + + assign locked_out_out = (rst_flag) ? 1'bx : locked_out; + +// +// detect_first_time_locked +// +always @(posedge locked_out) + if (first_time_locked == 0) + first_time_locked <= 1; + +// +// phase shift parameters +// + +always @(posedge lock_period) + ps_delay_init <= ps_in * period_orig /256; + + +always @(period) begin + period_int = period; + if (clkin_type==1) + period_ps_tmp = 2 * period; + else + period_ps_tmp = period; + + if (period_ps_tmp > 3000) + ps_max_range = 20 * (period_ps_tmp - 3000)/1000; + else + ps_max_range = 0; +end + +always @(ps_delay or rst_in or period_int or lock_period) + if ( rst_in) + ps_delay_md = 0; + else if (lock_period) begin + ps_delay_md = period_int + ps_delay % period_int; + end + +always @(posedge psclk_in or posedge rst_in or posedge lock_period_pulse) + if (rst_in) begin + ps_delay <= 0; + ps_overflow_out <= 0; + ps_acc <= 0; + end + else if (lock_period_pulse) + ps_delay <= ps_delay_init; + else + if (ps_type == 2'b10) + if (psen_in) begin + if (ps_lock == 1) + $display(" Warning : Please wait for PSDONE signal before adjusting the Phase Shift."); + else if (lock_ps) begin + if (psincdec_in == 1) begin + if (ps_acc > ps_max_range) + ps_overflow_out <= 1; + else begin + ps_delay <= ps_delay + PS_STEP; + ps_acc <= ps_acc + 1; + ps_overflow_out <= 0; + end + ps_lock <= 1; + end + else if (psincdec_in == 0) begin + if (ps_acc < -ps_max_range) + ps_overflow_out <= 1; + else begin + ps_delay <= ps_delay - PS_STEP; + ps_acc <= ps_acc - 1; + ps_overflow_out <= 0; + end + ps_lock <= 1; + end + end + end + +always @(posedge ps_lock) begin + @(posedge clkin_ps) + @(posedge psclk_in) + @(posedge psclk_in) + @(posedge psclk_in) + psdone_out <= 1; + @(posedge psclk_in) + psdone_out <= 0; + ps_lock <= 0; +end + +// +// determine clock period +// + +always @(posedge clkin_div or negedge clkin_div or posedge rst_in) + if (rst_in == 1) begin + clkin_period[0] <= 0; + clkin_period[1] <= 0; + clkin_period[2] <= 0; + clkin_edge <= 0; + end + else + if (clkin_div == 1) begin + clkin_edge <= $time; + clkin_period[2] <= clkin_period[1]; + clkin_period[1] <= clkin_period[0]; + if (clkin_edge != 0) + clkin_period[0] <= $time - clkin_edge; + end + else if (clkin_div == 0) + if (lock_period == 1) + if (100000000 < clkin_period[0]/1000) + begin + end + else if ((period_orig * 2 < clkin_period[0]) && (clock_stopped == 0)) begin + clkin_period[0] <= clkin_period[1]; + end + +always @(negedge clkin_div or posedge rst_in) + if (rst_in == 1) begin + lock_period <= 0; + clock_stopped <= 1; + end + else begin + if (lock_period == 1'b0) begin + if ((clkin_period[0] != 0) && + (clkin_period[0] - cycle_jitter <= clkin_period[1]) && + (clkin_period[1] <= clkin_period[0] + cycle_jitter) && + (clkin_period[1] - cycle_jitter <= clkin_period[2]) && + (clkin_period[2] <= clkin_period[1] + cycle_jitter)) begin + lock_period <= 1; + period_orig <= (clkin_period[0] + + clkin_period[1] + + clkin_period[2]) / 3; + period <= clkin_period[0]; + end + end + else if (lock_period == 1'b1) begin + if (100000000 < (clkin_period[0] / 1000)) begin + $display(" Warning : CLKIN stopped toggling on instance %m exceeds %d ms. Current CLKIN Period = %1.3f ns.", 100, clkin_period[0] / 1000.0); + lock_period <= 0; + @(negedge rst_reg[2]); + end + else if ((period_orig * 2 < clkin_period[0]) && clock_stopped == 1'b0) begin + clock_stopped <= 1'b1; + end + else if ((clkin_period[0] < period_orig - period_jitter) || + (period_orig + period_jitter < clkin_period[0])) begin + $display(" Warning : Input Clock Period Jitter on instance %m exceeds %1.3f ns. Locked CLKIN Period = %1.3f. Current CLKIN Period = %1.3f.", period_jitter / 1000.0, period_orig / 1000.0, clkin_period[0] / 1000.0); + lock_period <= 0; + @(negedge rst_reg[2]); + end + else if ((clkin_period[0] < clkin_period[1] - cycle_jitter) || + (clkin_period[1] + cycle_jitter < clkin_period[0])) begin + $display(" Warning : Input Clock Cycle-Cycle Jitter on instance %m exceeds %1.3f ns. Previous CLKIN Period = %1.3f. Current CLKIN Period = %1.3f.", cycle_jitter / 1000.0, clkin_period[1] / 1000.0, clkin_period[0] / 1000.0); + lock_period <= 0; + @(negedge rst_reg[2]); + end + else begin + period <= clkin_period[0]; + clock_stopped <= 1'b0; + end + end +end + + assign #1 lock_period_dly1 = lock_period; + assign #(period/2) lock_period_dly = lock_period_dly1; + assign lock_period_pulse = (lock_period_dly1==1 && lock_period_dly==0) ? 1 : 0; + +// +// determine clock delay +// + +//always @(posedge lock_period or posedge rst_in) +always @(posedge lock_ps_dly or posedge rst_in) + if (rst_in) begin + fb_delay <= 0; + fb_delay_found <= 0; + end + else begin + if (lock_period && clkfb_type != 2'b00) begin + if (clkfb_type == 2'b01) begin + @(posedge CLK0 or rst_in) + delay_edge = $time; + end + else if (clkfb_type == 2'b10) begin + @(posedge CLK2X or rst_in) + delay_edge = $time; + end + @(posedge clkfb_in or rst_in) begin + fb_delay <= ($time - delay_edge) % period_orig; + fb_delay_found <= 1; + end + end + end + +// +// determine feedback lock +// + +always @(posedge clkfb_chk or posedge rst_in) + if (rst_in) + clkfb_window <= 0; + else begin + clkfb_window <= 1; + #cycle_jitter clkfb_window <= 0; + end + +always @(posedge clkin_fb or posedge rst_in) + if (rst_in) + clkin_window <= 0; + else begin + clkin_window <= 1; + #cycle_jitter clkin_window <= 0; + end + +always @(posedge clkin_fb or posedge rst_in) + if (rst_in) + lock_clkin <= 0; + else begin + #1 + if ((clkfb_window && fb_delay_found) || (clkin_lost_out == 1'b1 && lock_out[0]==1'b1)) + lock_clkin <= 1; + else + if (chk_enable==1) + lock_clkin <= 0; + end + +always @(posedge clkfb_chk or posedge rst_in) + if (rst_in) + lock_clkfb <= 0; + else begin + #1 + if ((clkin_window && fb_delay_found) || (clkin_lost_out == 1'b1 && lock_out[0]==1'b1)) + lock_clkfb <= 1; + else + if (chk_enable ==1) + lock_clkfb <= 0; + end + +always @(negedge clkin_fb or posedge rst_in) + if (rst_in) + lock_delay <= 0; + else + lock_delay <= lock_clkin || lock_clkfb; + +// +// generate lock signal +// + +always @(posedge clkin_ps or posedge rst_in) + if (rst_in) begin + lock_out <= 2'b0; + locked_out <=0; + end + else begin + if (clkfb_type == 2'b00) + lock_out[0] <= lock_period; + else + lock_out[0] <= lock_period & lock_delay & lock_fb; + lock_out[1] <= lock_out[0]; + locked_out <= lock_out[1]; + end + +always @(negedge clkin_ps or posedge rst_in) + if (rst_in) + lock_out1_neg <= 0; + else + lock_out1_neg <= lock_out[1]; + + +// +// generate the clk1x_out +// + +always @(posedge clkin_ps or negedge clkin_ps or posedge rst_in) + if (rst_in) + clk0_out <= 0; + else + if (clkin_ps ==1) + if (clk1x_type==1 && lock_out[0]) begin + clk0_out <= 1; + #(period / 2) + clk0_out <= 0; + end + else + clk0_out <= 1; + else + if (clkin_ps == 0 && ((clk1x_type && lock_out[0]) == 0 || (lock_out[0]== 1 && lock_out[1]== 0))) + clk0_out <= 0; + +// +// generate the clk2x_out +// + +always @(posedge clkin_ps or posedge rst_in) + if (rst_in) + clk2x_out <= 0; + else begin + clk2x_out <= 1; + #(period / 4) + clk2x_out <= 0; + #(period / 4) + clk2x_out <= 1; + #(period / 4) + clk2x_out <= 0; + end + +// +// generate the clkdv_out +// + +always @(posedge clkin_ps or negedge clkin_ps or posedge rst_in) + if (rst_in) begin + clkdv_out <= 1'b0; + clkdv_cnt <= 0; + end + else + if (lock_out1_neg) begin + if (clkdv_cnt >= divide_type -1) + clkdv_cnt <= 0; + else + clkdv_cnt <= clkdv_cnt + 1; + + if (clkdv_cnt < divide_type /2) + clkdv_out <= 1'b1; + else + if ( (divide_type[0] == 1'b1) && dll_mode_type == 1'b0) + clkdv_out <= #(period/4) 1'b0; + else + clkdv_out <= 1'b0; + end + + +// +// generate fx output signal +// + +always @(lock_period or period or denominator or numerator) begin + if (lock_period == 1'b1) begin + period_fx = (period * denominator) / (numerator * 2); + remain_fx = (period * denominator) % (numerator * 2); + end +end + +always @(posedge clkin_ps or posedge clkin_lost_out or posedge rst_in ) + if (rst_in == 1) + clkfx_out = 1'b0; + else if (clkin_lost_out == 1'b1 ) begin + if (locked_out == 1) + @(negedge rst_reg[2]); + end + else + if (lock_out[1] == 1) begin + clkfx_out = 1'b1; + for (p = 0; p < (numerator * 2 - 1); p = p + 1) begin + #(period_fx); + if (p < remain_fx) + #1; + clkfx_out = !clkfx_out; + end + if (period_fx > (period / 2)) begin + #(period_fx - (period / 2)); + end + end + +// +// generate all output signal +// + +always @(rst_in) +if (rst_in) begin + assign CLK0 = 0; + assign CLK90 = 0; + assign CLK180 = 0; + assign CLK270 = 0; + assign CLK2X = 0; + assign CLK2X180 =0; + assign CLKDV = 0; + assign CLKFX = 0; + assign CLKFX180 = 0; +end +else begin + deassign CLK0; + deassign CLK90; + deassign CLK180; + deassign CLK270; + deassign CLK2X; + deassign CLK2X180; + deassign CLKDV; + deassign CLKFX; + deassign CLKFX180; +end + +always @(clk0_out) begin + CLK0 <= #(clkout_delay) clk0_out && (clkfb_type != 2'b00); + CLK90 <= #(clkout_delay + period / 4) clk0_out && !dll_mode_type && (clkfb_type != 2'b00); + CLK180 <= #(clkout_delay) ~clk0_out && (clkfb_type != 2'b00); + CLK270 <= #(clkout_delay + period / 4) ~clk0_out && !dll_mode_type && (clkfb_type != 2'b00); + end + +always @(clk2x_out) begin + CLK2X <= #(clkout_delay) clk2x_out && !dll_mode_type && (clkfb_type != 2'b00); + CLK2X180 <= #(clkout_delay) ~clk2x_out && !dll_mode_type && (clkfb_type != 2'b00); +end + +always @(clkdv_out) + CLKDV <= #(clkout_delay) clkdv_out && (clkfb_type != 2'b00); + +always @(clkfx_out ) + CLKFX <= #(clkout_delay) clkfx_out; + +always @( clkfx_out or first_time_locked or locked_out) + if ( ~first_time_locked) + CLKFX180 = 0; + else + CLKFX180 <= #(clkout_delay) ~clkfx_out; + + +endmodule + +////////////////////////////////////////////////////// + +module dcm_sp_clock_divide_by_2 (clock, clock_type, clock_out, rst); +input clock; +input clock_type; +input rst; +output clock_out; + +reg clock_out; +reg clock_div2; +reg [2:0] rst_reg; +wire clk_src; + +initial begin + clock_out = 1'b0; + clock_div2 = 1'b0; +end + +always @(posedge clock) + clock_div2 <= ~clock_div2; + +always @(posedge clock) begin + rst_reg[0] <= rst; + rst_reg[1] <= rst_reg[0] & rst; + rst_reg[2] <= rst_reg[1] & rst_reg[0] & rst; +end + +assign clk_src = (clock_type) ? clock_div2 : clock; + +always @(clk_src or rst or rst_reg) + if (rst == 1'b0) + clock_out = clk_src; + else if (rst == 1'b1) begin + clock_out = 1'b0; + @(negedge rst_reg[2]); + if (clk_src == 1'b1) + @(negedge clk_src); + end + + +endmodule + +module dcm_sp_maximum_period_check (clock, rst); +parameter clock_name = ""; +parameter maximum_period = 0; +input clock; +input rst; + +time clock_edge; +time clock_period; + +initial begin + clock_edge = 0; + clock_period = 0; +end + +always @(posedge clock) begin + clock_edge <= $time; +// clock_period <= $time - clock_edge; + clock_period = $time - clock_edge; + if (clock_period > maximum_period ) begin + if (rst == 0) + $display(" Warning : Input clock period of %1.3f ns, on the %s port of instance %m exceeds allowed value of %1.3f ns at time %1.3f ns.", clock_period/1000.0, clock_name, maximum_period/1000.0, $time/1000.0); + end +end +endmodule + +module dcm_sp_clock_lost (clock, enable, lost, rst); +input clock; +input enable; +input rst; +output lost; + +time clock_edge; +reg [63:0] period; +reg clock_low, clock_high; +reg clock_posedge, clock_negedge; +reg lost_r, lost_f, lost; +reg clock_second_pos, clock_second_neg; + +initial begin + clock_edge = 0; + clock_high = 0; + clock_low = 0; + lost_r = 0; + lost_f = 0; + period = 0; + clock_posedge = 0; + clock_negedge = 0; + clock_second_pos = 0; + clock_second_neg = 0; +end + +always @(posedge clock or posedge rst) + if (rst==1) + period <= 0; + else begin + clock_edge <= $time; + if (period != 0 && (($time - clock_edge) <= (1.5 * period))) + period <= $time - clock_edge; + else if (period != 0 && (($time - clock_edge) > (1.5 * period))) + period <= 0; + else if ((period == 0) && (clock_edge != 0) && clock_second_pos == 1) + period <= $time - clock_edge; + end + + +always @(posedge clock or posedge rst) + if (rst) + lost_r <= 0; + else + if (enable == 1 && clock_second_pos == 1) begin + #1; + if ( period != 0) + lost_r <= 0; + #((period * 9.1) / 10) + if ((clock_low != 1'b1) && (clock_posedge != 1'b1) && rst == 0) + lost_r <= 1; + end + +always @(posedge clock or negedge clock or posedge rst) + if (rst) begin + clock_second_pos <= 0; + clock_second_neg <= 0; + end + else if (clock) + clock_second_pos <= 1; + else if (~clock) + clock_second_neg <= 1; + +always @(negedge clock or posedge rst) + if (rst==1) begin + lost_f <= 0; + end + else begin + if (enable == 1 && clock_second_neg == 1) begin + if ( period != 0) + lost_f <= 0; + #((period * 9.1) / 10) + if ((clock_high != 1'b1) && (clock_negedge != 1'b1) && rst == 0) + lost_f <= 1; + end + end + +always @( lost_r or lost_f or enable) +begin + if (enable == 1) + lost = lost_r | lost_f; + else + lost = 0; +end + + +always @(posedge clock or negedge clock or posedge rst) + if (rst==1) begin + clock_low <= 1'b0; + clock_high <= 1'b0; + clock_posedge <= 1'b0; + clock_negedge <= 1'b0; + end + else begin + if (clock ==1) begin + clock_low <= 1'b0; + clock_high <= 1'b1; + clock_posedge <= 1'b0; + clock_negedge <= 1'b1; + end + else if (clock == 0) begin + clock_low <= 1'b1; + clock_high <= 1'b0; + clock_posedge <= 1'b1; + clock_negedge <= 1'b0; + end +end + + +endmodule |