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+
+// ===========================================================================
+// >>>>>>>>>>>>>>>>>>>>>>> COPYRIGHT NOTICE <<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<
+// ---------------------------------------------------------------------------
+// Copyright (c) 2015 by Lattice Semiconductor Corporation
+// ALL RIGHTS RESERVED
+// ------------------------------------------------------------------
+//
+// Permission:
+//
+// Lattice SG Pte. Ltd. grants permission to use this code
+// pursuant to the terms of the Lattice Reference Design License Agreement.
+//
+//
+// Disclaimer:
+//
+// This VHDL or Verilog source code is intended as a design reference
+// which illustrates how these types of functions can be implemented.
+// It is the user's responsibility to verify their design for
+// consistency and functionality through the use of formal
+// verification methods. Lattice provides no warranty
+// regarding the use or functionality of this code.
+//
+// ---------------------------------------------------------------------------
+//
+// Lattice SG Pte. Ltd.
+// 101 Thomson Road, United Square #07-02
+// Singapore 307591
+//
+//
+// TEL: 1-800-Lattice (USA and Canada)
+// +65-6631-2000 (Singapore)
+// +1-503-268-8001 (other locations)
+//
+// web: http://www.latticesemi.com/
+// email: techsupport@latticesemi.com
+//
+// ---------------------------------------------------------------------------
+//
+// =============================================================================
+// FILE DETAILS
+// Project : SLL - Soft Loss Of Lock(LOL) Logic
+// File : sll_core.v
+// Title : Top-level file for SLL
+// Dependencies : 1.
+// : 2.
+// Description :
+// =============================================================================
+// REVISION HISTORY
+// Version : 1.0
+// Author(s) : AV
+// Mod. Date : March 2, 2015
+// Changes Made : Initial Creation
+// =============================================================================
+// REVISION HISTORY
+// Version : 1.1
+// Author(s) : AV
+// Mod. Date : June 8, 2015
+// Changes Made : Following updates were made
+// : 1. Changed all the PLOL status logic and FSM to run
+// : on sli_refclk.
+// : 2. Added the HB logic for presence of tx_pclk
+// : 3. Changed the lparam assignment scheme for
+// : simulation purposes.
+// =============================================================================
+// REVISION HISTORY
+// Version : 1.2
+// Author(s) : AV
+// Mod. Date : June 24, 2015
+// Changes Made : Updated the gearing logic for SDI dynamic rate change
+// =============================================================================
+// REVISION HISTORY
+// Version : 1.3
+// Author(s) : AV
+// Mod. Date : July 14, 2015
+// Changes Made : Added the logic for dynamic rate change in CPRI
+// =============================================================================
+// REVISION HISTORY
+// Version : 1.4
+// Author(s) : AV
+// Mod. Date : August 21, 2015
+// Changes Made : Added the logic for dynamic rate change of 5G CPRI &
+// PCIe.
+// =============================================================================
+// REVISION HISTORY
+// Version : 1.5
+// Author(s) : ES/EB
+// Mod. Date : March 21, 2017
+// Changes Made : 1. Added pdiff_sync signal to syncrhonize pcount_diff
+// : to sli_refclk.
+// : 2. Updated terminal count logic for PCIe 5G
+// : 3. Modified checking of pcount_diff in SLL state
+// : machine to cover actual count
+// : (from 16-bits to 22-bits)
+// =============================================================================
+// REVISION HISTORY
+// Version : 1.6
+// Author(s) : ES
+// Mod. Date : April 19, 2017
+// Changes Made : 1. Added registered lock and unlock signal from
+// pdiff_sync to totally decouple pcount_diff from
+// SLL state machine.
+// : 2. Modified LPCLK_TC_4 to 1:1 clock ratio when CPRI
+// is operating @ 4.9125Gbps data rate.
+// =============================================================================
+`timescale 1ns/10ps
+
+module sgmii2sll_core (
+ //Reset and Clock inputs
+ sli_rst, //Active high asynchronous reset input
+ sli_refclk, //Refclk input to the Tx PLL
+ sli_pclk, //Tx pclk output from the PCS
+
+ //Control inputs
+ sli_div2_rate, //Divide by 2 control; 0 - Full rate; 1 - Half rate
+ sli_div11_rate, //Divide by 11 control; 0 - Full rate; 1 - Div by 11
+ sli_gear_mode, //Gear mode control for PCS; 0 - 8/10; 1- 16/20
+ sli_cpri_mode, //Mode of operation specific to CPRI protocol
+ sli_pcie_mode, //Mode of operation specific to PCIe mode (2.5G or 5G)
+
+ //LOL Output
+ slo_plol //Tx PLL Loss of Lock output to the user logic
+ );
+
+// Inputs
+input sli_rst;
+input sli_refclk;
+input sli_pclk;
+input sli_div2_rate;
+input sli_div11_rate;
+input sli_gear_mode;
+input [2:0] sli_cpri_mode;
+input sli_pcie_mode;
+
+// Outputs
+output slo_plol;
+
+
+// Parameters
+parameter PPROTOCOL = "PCIE"; //Protocol selected by the User
+parameter PLOL_SETTING = 0; //PLL LOL setting. Possible values are 0,1,2,3
+parameter PDYN_RATE_CTRL = "DISABLED"; //PCS Dynamic Rate control
+parameter PPCIE_MAX_RATE = "2.5"; //PCIe max data rate
+parameter PDIFF_VAL_LOCK = 20; //Differential count value for Lock
+parameter PDIFF_VAL_UNLOCK = 39; //Differential count value for Unlock
+parameter PPCLK_TC = 65535; //Terminal count value for counter running on sli_pclk
+parameter PDIFF_DIV11_VAL_LOCK = 3; //Differential count value for Lock for SDI Div11
+parameter PDIFF_DIV11_VAL_UNLOCK = 3; //Differential count value for Unlock for SDI Div11
+parameter PPCLK_DIV11_TC = 2383; //Terminal count value (SDI Div11) for counter running on sli_pclk
+
+
+// Local Parameters
+localparam [1:0] LPLL_LOSS_ST = 2'b00; //PLL Loss state
+localparam [1:0] LPLL_PRELOSS_ST = 2'b01; //PLL Pre-Loss state
+localparam [1:0] LPLL_PRELOCK_ST = 2'b10; //PLL Pre-Lock state
+localparam [1:0] LPLL_LOCK_ST = 2'b11; //PLL Lock state
+`ifdef RSL_SIM_MODE
+localparam [15:0] LRCLK_TC = 16'd63; //Terminal count value for counter running on sli_refclk
+`else
+localparam [15:0] LRCLK_TC = 16'd65535; //Terminal count value for counter running on sli_refclk
+`endif
+localparam [15:0] LRCLK_TC_PUL_WIDTH = 16'd50; //Pulse width for the Refclk terminal count pulse
+localparam [7:0] LHB_WAIT_CNT = 8'd255; //Wait count for the Heartbeat signal
+
+// Local Parameters related to the CPRI dynamic modes
+// Terminal count values for the four CPRI modes
+localparam LPCLK_TC_0 = 32768;
+localparam LPCLK_TC_1 = 65536;
+localparam LPCLK_TC_2 = 131072;
+localparam LPCLK_TC_3 = 163840;
+localparam LPCLK_TC_4 = 65536;
+
+// Lock values count values for the four CPRI modes and four PLOL settings (4x5)
+// CPRI rate mode 0 CPRI rate mode 1 CPRI rate mode 2 CPRI rate mode 3 CPRI rate mode 4
+localparam LPDIFF_LOCK_00 = 9; localparam LPDIFF_LOCK_10 = 19; localparam LPDIFF_LOCK_20 = 39; localparam LPDIFF_LOCK_30 = 49; localparam LPDIFF_LOCK_40 = 19;
+localparam LPDIFF_LOCK_01 = 9; localparam LPDIFF_LOCK_11 = 19; localparam LPDIFF_LOCK_21 = 39; localparam LPDIFF_LOCK_31 = 49; localparam LPDIFF_LOCK_41 = 19;
+localparam LPDIFF_LOCK_02 = 49; localparam LPDIFF_LOCK_12 = 98; localparam LPDIFF_LOCK_22 = 196; localparam LPDIFF_LOCK_32 = 245; localparam LPDIFF_LOCK_42 = 98;
+localparam LPDIFF_LOCK_03 = 131; localparam LPDIFF_LOCK_13 = 262; localparam LPDIFF_LOCK_23 = 524; localparam LPDIFF_LOCK_33 = 655; localparam LPDIFF_LOCK_43 = 262;
+
+// Unlock values count values for the four CPRI modes and four PLOL settings (4x5)
+// CPRI rate mode 0 CPRI rate mode 1 CPRI rate mode 2 CPRI rate mode 3 CPRI rate mode 4
+localparam LPDIFF_UNLOCK_00 = 19; localparam LPDIFF_UNLOCK_10 = 39; localparam LPDIFF_UNLOCK_20 = 78; localparam LPDIFF_UNLOCK_30 = 98; localparam LPDIFF_UNLOCK_40 = 39;
+localparam LPDIFF_UNLOCK_01 = 65; localparam LPDIFF_UNLOCK_11 = 131; localparam LPDIFF_UNLOCK_21 = 262; localparam LPDIFF_UNLOCK_31 = 327; localparam LPDIFF_UNLOCK_41 = 131;
+localparam LPDIFF_UNLOCK_02 = 72; localparam LPDIFF_UNLOCK_12 = 144; localparam LPDIFF_UNLOCK_22 = 288; localparam LPDIFF_UNLOCK_32 = 360; localparam LPDIFF_UNLOCK_42 = 144;
+localparam LPDIFF_UNLOCK_03 = 196; localparam LPDIFF_UNLOCK_13 = 393; localparam LPDIFF_UNLOCK_23 = 786; localparam LPDIFF_UNLOCK_33 = 983; localparam LPDIFF_UNLOCK_43 = 393;
+
+// Input and Output reg and wire declarations
+wire sli_rst;
+wire sli_refclk;
+wire sli_pclk;
+wire sli_div2_rate;
+wire sli_div11_rate;
+wire sli_gear_mode;
+wire [2:0] sli_cpri_mode;
+wire sli_pcie_mode;
+wire slo_plol;
+
+//-------------- Internal signals reg and wire declarations --------------------
+
+//Signals running on sli_refclk
+reg [15:0] rcount; //16-bit Counter
+reg rtc_pul; //Terminal count pulse
+reg rtc_pul_p1; //Terminal count pulse pipeline
+reg rtc_ctrl; //Terminal count pulse control
+
+reg [7:0] rhb_wait_cnt; //Heartbeat wait counter
+
+//Heatbeat synchronization and pipeline registers
+wire rhb_sync;
+reg rhb_sync_p2;
+reg rhb_sync_p1;
+
+//Pipeling registers for dynamic control mode
+wire rgear;
+wire rdiv2;
+wire rdiv11;
+reg rgear_p1;
+reg rdiv2_p1;
+reg rdiv11_p1;
+
+reg rstat_pclk; //Pclk presence/absence status
+
+reg [21:0] rcount_tc; //Tx_pclk terminal count register
+reg [15:0] rdiff_comp_lock; //Differential comparison value for Lock
+reg [15:0] rdiff_comp_unlock; //Differential compariosn value for Unlock
+
+wire rpcie_mode; //PCIe mode signal synchronized to refclk
+reg rpcie_mode_p1; //PCIe mode pipeline register
+
+wire rcpri_mod_ch_sync; //CPRI mode change synchronized to refclk
+reg rcpri_mod_ch_p1; //CPRI mode change pipeline register
+reg rcpri_mod_ch_p2; //CPRI mode change pipeline register
+reg rcpri_mod_ch_st; //CPRI mode change status
+
+reg [1:0] sll_state; //Current-state register for LOL FSM
+
+reg pll_lock; //PLL Lock signal
+
+//Signals running on sli_pclk
+//Synchronization and pipeline registers
+wire ppul_sync;
+reg ppul_sync_p1;
+reg ppul_sync_p2;
+reg ppul_sync_p3;
+
+wire pdiff_sync;
+reg pdiff_sync_p1;
+
+reg [21:0] pcount; //22-bit counter
+reg [21:0] pcount_diff; //Differential value between Tx_pclk counter and theoritical value
+
+//Heartbeat counter and heartbeat signal running on pclk
+reg [2:0] phb_cnt;
+reg phb;
+
+//CPRI dynamic mode releated signals
+reg [2:0] pcpri_mode;
+reg pcpri_mod_ch;
+
+//Assignment scheme changed mainly for simulation purpose
+wire [15:0] LRCLK_TC_w;
+assign LRCLK_TC_w = LRCLK_TC;
+
+reg unlock;
+reg lock;
+
+//Heartbeat synchronization
+sync # (.PDATA_RST_VAL(0)) phb_sync_inst (
+ .clk (sli_refclk),
+ .rst (sli_rst),
+ .data_in (phb),
+ .data_out(rhb_sync)
+ );
+
+
+//Terminal count pulse synchronization
+sync # (.PDATA_RST_VAL(0)) rtc_sync_inst (
+ .clk (sli_pclk),
+ .rst (sli_rst),
+ .data_in (rtc_pul),
+ .data_out(ppul_sync)
+ );
+
+//Differential value logic update synchronization
+sync # (.PDATA_RST_VAL(0)) pdiff_sync_inst (
+ .clk (sli_refclk),
+ .rst (sli_rst),
+ .data_in (ppul_sync),
+ .data_out(pdiff_sync)
+ );
+
+//Gear mode synchronization
+sync # (.PDATA_RST_VAL(0)) gear_sync_inst (
+ .clk (sli_refclk),
+ .rst (sli_rst),
+ .data_in (sli_gear_mode),
+ .data_out(rgear)
+ );
+
+//Div2 synchronization
+sync # (.PDATA_RST_VAL(0)) div2_sync_inst (
+ .clk (sli_refclk),
+ .rst (sli_rst),
+ .data_in (sli_div2_rate),
+ .data_out(rdiv2)
+ );
+
+//Div11 synchronization
+sync # (.PDATA_RST_VAL(0)) div11_sync_inst (
+ .clk (sli_refclk),
+ .rst (sli_rst),
+ .data_in (sli_div11_rate),
+ .data_out(rdiv11)
+ );
+
+//CPRI mode change synchronization
+sync # (.PDATA_RST_VAL(0)) cpri_mod_sync_inst (
+ .clk (sli_refclk),
+ .rst (sli_rst),
+ .data_in (pcpri_mod_ch),
+ .data_out(rcpri_mod_ch_sync)
+ );
+
+//PCIe mode change synchronization
+sync # (.PDATA_RST_VAL(0)) pcie_mod_sync_inst (
+ .clk (sli_refclk),
+ .rst (sli_rst),
+ .data_in (sli_pcie_mode),
+ .data_out(rpcie_mode)
+ );
+
+// =============================================================================
+// Synchronized Lock/Unlock signals
+// =============================================================================
+always @(posedge sli_refclk or posedge sli_rst) begin
+ if (sli_rst == 1'b1) begin
+ unlock <= 1'b0;
+ lock <= 1'b0;
+ pdiff_sync_p1 <= 1'b0;
+ end
+ else begin
+ pdiff_sync_p1 <= pdiff_sync;
+ if (unlock) begin
+ unlock <= ~pdiff_sync && pdiff_sync_p1 ? 1'b0 : unlock;
+ end
+ else begin
+ unlock <= pdiff_sync ? (pcount_diff[21:0] > {6'd0, rdiff_comp_unlock}) : 1'b0;
+ end
+ if (lock) begin
+ lock <= ~pdiff_sync && pdiff_sync_p1 ? 1'b0 : lock;
+ end
+ else begin
+ lock <= pdiff_sync ? (pcount_diff[21:0] <= {6'd0, rdiff_comp_lock}) : 1'b0;
+ end
+ end
+end
+
+// =============================================================================
+// Refclk Counter, pulse generation logic and Heartbeat monitor logic
+// =============================================================================
+always @(posedge sli_refclk or posedge sli_rst) begin
+ if (sli_rst == 1'b1) begin
+ rcount <= 16'd0;
+ rtc_pul <= 1'b0;
+ rtc_ctrl <= 1'b0;
+ rtc_pul_p1 <= 1'b0;
+ end
+ else begin
+ //Counter logic
+ if ((rgear_p1^rgear == 1'b1) || (rdiv2_p1^rdiv2 == 1'b1) || (rdiv11_p1^rdiv11 == 1'b1) || (rcpri_mod_ch_p1^rcpri_mod_ch_p2 == 1'b1) || (rpcie_mode_p1^rpcie_mode == 1'b1)) begin
+ if (rtc_ctrl == 1'b1) begin
+ rcount <= LRCLK_TC_PUL_WIDTH;
+ end
+ end
+ else begin
+ if (rcount != LRCLK_TC_w) begin
+ rcount <= rcount + 1;
+ end
+ else begin
+ rcount <= 16'd0;
+ end
+ end
+
+ //Pulse control logic
+ if (rcount == LRCLK_TC_w - 1) begin
+ rtc_ctrl <= 1'b1;
+ end
+
+ //Pulse Generation logic
+ if (rtc_ctrl == 1'b1) begin
+ if ((rcount == LRCLK_TC_w) || (rcount < LRCLK_TC_PUL_WIDTH)) begin
+ rtc_pul <= 1'b1;
+ end
+ else begin
+ rtc_pul <= 1'b0;
+ end
+ end
+
+ rtc_pul_p1 <= rtc_pul;
+ end
+end
+
+
+// =============================================================================
+// Heartbeat synchronization & monitor logic and Dynamic mode pipeline logic
+// =============================================================================
+always @(posedge sli_refclk or posedge sli_rst) begin
+ if (sli_rst == 1'b1) begin
+ rhb_sync_p1 <= 1'b0;
+ rhb_sync_p2 <= 1'b0;
+ rhb_wait_cnt <= 8'd0;
+ rstat_pclk <= 1'b0;
+ rgear_p1 <= 1'b0;
+ rdiv2_p1 <= 1'b0;
+ rdiv11_p1 <= 1'b0;
+ rcpri_mod_ch_p1 <= 1'b0;
+ rcpri_mod_ch_p2 <= 1'b0;
+ rcpri_mod_ch_st <= 1'b0;
+ rpcie_mode_p1 <= 1'b0;
+
+ end
+ else begin
+ //Pipeline stages for the Heartbeat
+ rhb_sync_p1 <= rhb_sync;
+ rhb_sync_p2 <= rhb_sync_p1;
+
+ //Pipeline stages of the Dynamic rate control signals
+ rgear_p1 <= rgear;
+ rdiv2_p1 <= rdiv2;
+ rdiv11_p1 <= rdiv11;
+
+ //Pipeline stage for PCIe mode
+ rpcie_mode_p1 <= rpcie_mode;
+
+ //Pipeline stage for CPRI mode change
+ rcpri_mod_ch_p1 <= rcpri_mod_ch_sync;
+ rcpri_mod_ch_p2 <= rcpri_mod_ch_p1;
+
+ //CPRI mode change status logic
+ if (rcpri_mod_ch_p1^rcpri_mod_ch_sync == 1'b1) begin
+ rcpri_mod_ch_st <= 1'b1;
+ end
+
+ //Heartbeat wait counter and monitor logic
+ if (rtc_ctrl == 1'b1) begin
+ if (rhb_sync_p1 == 1'b1 && rhb_sync_p2 == 1'b0) begin
+ rhb_wait_cnt <= 8'd0;
+ rstat_pclk <= 1'b1;
+ end
+ else if (rhb_wait_cnt == LHB_WAIT_CNT) begin
+ rhb_wait_cnt <= 8'd0;
+ rstat_pclk <= 1'b0;
+ end
+ else begin
+ rhb_wait_cnt <= rhb_wait_cnt + 1;
+ end
+ end
+ end
+end
+
+
+// =============================================================================
+// Pipleline registers for the TC pulse and CPRI mode change logic
+// =============================================================================
+always @(posedge sli_pclk or posedge sli_rst) begin
+ if (sli_rst == 1'b1) begin
+ ppul_sync_p1 <= 1'b0;
+ ppul_sync_p2 <= 1'b0;
+ ppul_sync_p3 <= 1'b0;
+ pcpri_mode <= 3'b0;
+ pcpri_mod_ch <= 1'b0;
+ end
+ else begin
+ ppul_sync_p1 <= ppul_sync;
+ ppul_sync_p2 <= ppul_sync_p1;
+ ppul_sync_p3 <= ppul_sync_p2;
+
+ //CPRI mode change logic
+ pcpri_mode <= sli_cpri_mode;
+
+ if (pcpri_mode != sli_cpri_mode) begin
+ pcpri_mod_ch <= ~pcpri_mod_ch;
+ end
+ end
+end
+
+
+// =============================================================================
+// Terminal count logic
+// =============================================================================
+
+//For SDI protocol with Dynamic rate control enabled
+generate
+if ((PDYN_RATE_CTRL == "ENABLED") && (PPROTOCOL == "SDI")) begin
+always @(posedge sli_refclk or posedge sli_rst) begin
+ if (sli_rst == 1'b1) begin
+ rcount_tc <= 22'd0;
+ rdiff_comp_lock <= 16'd0;
+ rdiff_comp_unlock <= 16'd0;
+ end
+ else begin
+ //Terminal count logic
+ //Div by 11 is enabled
+ if (rdiv11 == 1'b1) begin
+ //Gear mode is 16/20
+ if (rgear == 1'b1) begin
+ rcount_tc <= PPCLK_DIV11_TC;
+ rdiff_comp_lock <= PDIFF_DIV11_VAL_LOCK;
+ rdiff_comp_unlock <= PDIFF_DIV11_VAL_UNLOCK;
+ end
+ else begin
+ rcount_tc <= {PPCLK_DIV11_TC[20:0], 1'b0};
+ rdiff_comp_lock <= {PDIFF_DIV11_VAL_LOCK[14:0], 1'b0};
+ rdiff_comp_unlock <= {PDIFF_DIV11_VAL_UNLOCK[14:0], 1'b0};
+ end
+ end
+ //Div by 2 is enabled
+ else if (rdiv2 == 1'b1) begin
+ //Gear mode is 16/20
+ if (rgear == 1'b1) begin
+ rcount_tc <= {1'b0,PPCLK_TC[21:1]};
+ rdiff_comp_lock <= {1'b0,PDIFF_VAL_LOCK[15:1]};
+ rdiff_comp_unlock <= {1'b0,PDIFF_VAL_UNLOCK[15:1]};
+ end
+ else begin
+ rcount_tc <= PPCLK_TC;
+ rdiff_comp_lock <= PDIFF_VAL_LOCK;
+ rdiff_comp_unlock <= PDIFF_VAL_UNLOCK;
+ end
+ end
+ //Both div by 11 and div by 2 are disabled
+ else begin
+ //Gear mode is 16/20
+ if (rgear == 1'b1) begin
+ rcount_tc <= PPCLK_TC;
+ rdiff_comp_lock <= PDIFF_VAL_LOCK;
+ rdiff_comp_unlock <= PDIFF_VAL_UNLOCK;
+ end
+ else begin
+ rcount_tc <= {PPCLK_TC[20:0],1'b0};
+ rdiff_comp_lock <= {PDIFF_VAL_LOCK[14:0],1'b0};
+ rdiff_comp_unlock <= {PDIFF_VAL_UNLOCK[14:0],1'b0};
+ end
+ end
+ end
+end
+end
+endgenerate
+
+//For G8B10B protocol with Dynamic rate control enabled
+generate
+if ((PDYN_RATE_CTRL == "ENABLED") && (PPROTOCOL == "G8B10B")) begin
+always @(posedge sli_refclk or posedge sli_rst) begin
+ if (sli_rst == 1'b1) begin
+ rcount_tc <= 22'd0;
+ rdiff_comp_lock <= 16'd0;
+ rdiff_comp_unlock <= 16'd0;
+ end
+ else begin
+ //Terminal count logic
+ //Div by 2 is enabled
+ if (rdiv2 == 1'b1) begin
+ rcount_tc <= {1'b0,PPCLK_TC[21:1]};
+ rdiff_comp_lock <= {1'b0,PDIFF_VAL_LOCK[15:1]};
+ rdiff_comp_unlock <= {1'b0,PDIFF_VAL_UNLOCK[15:1]};
+ end
+ else begin
+ rcount_tc <= PPCLK_TC;
+ rdiff_comp_lock <= PDIFF_VAL_LOCK;
+ rdiff_comp_unlock <= PDIFF_VAL_UNLOCK;
+ end
+ end
+end
+end
+endgenerate
+
+
+//For CPRI protocol with Dynamic rate control is disabled
+generate
+if ((PDYN_RATE_CTRL == "DISABLED") && (PPROTOCOL == "CPRI")) begin
+always @(posedge sli_refclk or posedge sli_rst) begin
+ if (sli_rst == 1'b1) begin
+ rcount_tc <= 22'd0;
+ rdiff_comp_lock <= 16'd0;
+ rdiff_comp_unlock <= 16'd0;
+ end
+ else begin
+ //Terminal count logic for CPRI protocol
+ //Only if there is a change in the rate mode from the default
+ if (rcpri_mod_ch_st == 1'b1) begin
+ if (rcpri_mod_ch_p1^rcpri_mod_ch_p2 == 1'b1) begin
+ case(sli_cpri_mode)
+ 3'd0 : begin //For 0.6Gbps
+ rcount_tc <= LPCLK_TC_0;
+ case(PLOL_SETTING)
+ 'd0 : begin
+ rdiff_comp_lock <= LPDIFF_LOCK_00;
+ rdiff_comp_unlock <= LPDIFF_UNLOCK_00;
+ end
+
+ 'd1 : begin
+ rdiff_comp_lock <= LPDIFF_LOCK_01;
+ rdiff_comp_unlock <= LPDIFF_UNLOCK_01;
+ end
+
+ 'd2 : begin
+ rdiff_comp_lock <= LPDIFF_LOCK_02;
+ rdiff_comp_unlock <= LPDIFF_UNLOCK_02;
+ end
+
+ 'd3 : begin
+ rdiff_comp_lock <= LPDIFF_LOCK_03;
+ rdiff_comp_unlock <= LPDIFF_UNLOCK_03;
+ end
+
+ default : begin
+ rdiff_comp_lock <= LPDIFF_LOCK_00;
+ rdiff_comp_unlock <= LPDIFF_UNLOCK_00;
+ end
+ endcase
+ end
+
+ 3'd1 : begin //For 1.2Gbps
+ rcount_tc <= LPCLK_TC_1;
+ case(PLOL_SETTING)
+ 'd0 : begin
+ rdiff_comp_lock <= LPDIFF_LOCK_10;
+ rdiff_comp_unlock <= LPDIFF_UNLOCK_10;
+ end
+
+ 'd1 : begin
+ rdiff_comp_lock <= LPDIFF_LOCK_11;
+ rdiff_comp_unlock <= LPDIFF_UNLOCK_11;
+ end
+
+ 'd2 : begin
+ rdiff_comp_lock <= LPDIFF_LOCK_12;
+ rdiff_comp_unlock <= LPDIFF_UNLOCK_12;
+ end
+
+ 'd3 : begin
+ rdiff_comp_lock <= LPDIFF_LOCK_13;
+ rdiff_comp_unlock <= LPDIFF_UNLOCK_13;
+ end
+
+ default : begin
+ rdiff_comp_lock <= LPDIFF_LOCK_10;
+ rdiff_comp_unlock <= LPDIFF_UNLOCK_10;
+ end
+ endcase
+ end
+
+ 3'd2 : begin //For 2.4Gbps
+ rcount_tc <= LPCLK_TC_2;
+ case(PLOL_SETTING)
+ 'd0 : begin
+ rdiff_comp_lock <= LPDIFF_LOCK_20;
+ rdiff_comp_unlock <= LPDIFF_UNLOCK_20;
+ end
+
+ 'd1 : begin
+ rdiff_comp_lock <= LPDIFF_LOCK_21;
+ rdiff_comp_unlock <= LPDIFF_UNLOCK_21;
+ end
+
+ 'd2 : begin
+ rdiff_comp_lock <= LPDIFF_LOCK_22;
+ rdiff_comp_unlock <= LPDIFF_UNLOCK_22;
+ end
+
+ 'd3 : begin
+ rdiff_comp_lock <= LPDIFF_LOCK_23;
+ rdiff_comp_unlock <= LPDIFF_UNLOCK_23;
+ end
+
+ default : begin
+ rdiff_comp_lock <= LPDIFF_LOCK_20;
+ rdiff_comp_unlock <= LPDIFF_UNLOCK_20;
+ end
+ endcase
+ end
+
+ 3'd3 : begin //For 3.07Gbps
+ rcount_tc <= LPCLK_TC_3;
+ case(PLOL_SETTING)
+ 'd0 : begin
+ rdiff_comp_lock <= LPDIFF_LOCK_30;
+ rdiff_comp_unlock <= LPDIFF_UNLOCK_30;
+ end
+
+ 'd1 : begin
+ rdiff_comp_lock <= LPDIFF_LOCK_31;
+ rdiff_comp_unlock <= LPDIFF_UNLOCK_31;
+ end
+
+ 'd2 : begin
+ rdiff_comp_lock <= LPDIFF_LOCK_32;
+ rdiff_comp_unlock <= LPDIFF_UNLOCK_32;
+ end
+
+ 'd3 : begin
+ rdiff_comp_lock <= LPDIFF_LOCK_33;
+ rdiff_comp_unlock <= LPDIFF_UNLOCK_33;
+ end
+ endcase
+ end
+
+ 3'd4 : begin //For 4.9125bps
+ rcount_tc <= LPCLK_TC_4;
+ case(PLOL_SETTING)
+ 'd0 : begin
+ rdiff_comp_lock <= LPDIFF_LOCK_40;
+ rdiff_comp_unlock <= LPDIFF_UNLOCK_40;
+ end
+
+ 'd1 : begin
+ rdiff_comp_lock <= LPDIFF_LOCK_41;
+ rdiff_comp_unlock <= LPDIFF_UNLOCK_41;
+ end
+
+ 'd2 : begin
+ rdiff_comp_lock <= LPDIFF_LOCK_42;
+ rdiff_comp_unlock <= LPDIFF_UNLOCK_42;
+ end
+
+ 'd3 : begin
+ rdiff_comp_lock <= LPDIFF_LOCK_43;
+ rdiff_comp_unlock <= LPDIFF_UNLOCK_43;
+ end
+
+ default : begin
+ rdiff_comp_lock <= LPDIFF_LOCK_40;
+ rdiff_comp_unlock <= LPDIFF_UNLOCK_40;
+ end
+ endcase
+ end
+
+ default : begin
+ rcount_tc <= LPCLK_TC_0;
+ rdiff_comp_lock <= LPDIFF_LOCK_00;
+ rdiff_comp_unlock <= LPDIFF_UNLOCK_00;
+ end
+ endcase
+ end
+ end
+ else begin
+ //If there is no change in the CPRI rate mode from default
+ rcount_tc <= PPCLK_TC;
+ rdiff_comp_lock <= PDIFF_VAL_LOCK;
+ rdiff_comp_unlock <= PDIFF_VAL_UNLOCK;
+ end
+ end
+end
+end
+endgenerate
+
+//For PCIe protocol with Dynamic rate control disabled
+generate
+if ((PDYN_RATE_CTRL == "DISABLED") && (PPROTOCOL == "PCIE")) begin
+always @(posedge sli_refclk or posedge sli_rst) begin
+ if (sli_rst == 1'b1) begin
+ rcount_tc <= 22'd0;
+ rdiff_comp_lock <= 16'd0;
+ rdiff_comp_unlock <= 16'd0;
+ end
+ else begin
+ //Terminal count logic
+ if (PPCIE_MAX_RATE == "2.5") begin
+ //2.5G mode is enabled
+ rcount_tc <= PPCLK_TC;
+ rdiff_comp_lock <= PDIFF_VAL_LOCK;
+ rdiff_comp_unlock <= PDIFF_VAL_UNLOCK;
+ end
+ else begin
+ //5G mode is enabled
+ if (rpcie_mode == 1'b1) begin
+ rcount_tc <= PPCLK_TC;
+ rdiff_comp_lock <= PDIFF_VAL_LOCK;
+ rdiff_comp_unlock <= PDIFF_VAL_UNLOCK;
+ end
+ else begin
+ //2.5G mode is enabled
+ rcount_tc <= {1'b0,PPCLK_TC[21:1]};
+ rdiff_comp_lock <= {1'b0,PDIFF_VAL_LOCK[15:1]};
+ rdiff_comp_unlock <= {1'b0,PDIFF_VAL_UNLOCK[15:1]};
+ end
+ end
+ end
+end
+end
+endgenerate
+
+//For all protocols other than CPRI & PCIe
+generate
+if ((PDYN_RATE_CTRL == "DISABLED") && ((PPROTOCOL != "CPRI") && (PPROTOCOL != "PCIE"))) begin
+always @(posedge sli_refclk or posedge sli_rst) begin
+ if (sli_rst == 1'b1) begin
+ rcount_tc <= 22'd0;
+ rdiff_comp_lock <= 16'd0;
+ rdiff_comp_unlock <= 16'd0;
+ end
+ else begin
+ //Terminal count logic for all protocols other than CPRI & PCIe
+ rcount_tc <= PPCLK_TC;
+ rdiff_comp_lock <= PDIFF_VAL_LOCK;
+ rdiff_comp_unlock <= PDIFF_VAL_UNLOCK;
+ end
+end
+end
+endgenerate
+
+
+// =============================================================================
+// Tx_pclk counter, Heartbeat and Differential value logic
+// =============================================================================
+always @(posedge sli_pclk or posedge sli_rst) begin
+ if (sli_rst == 1'b1) begin
+ pcount <= 22'd0;
+ pcount_diff <= 22'd65535;
+ phb_cnt <= 3'd0;
+ phb <= 1'b0;
+ end
+ else begin
+ //Counter logic
+ if (ppul_sync_p1 == 1'b1 && ppul_sync_p2 == 1'b0) begin
+ pcount <= 22'd0;
+ end
+ else begin
+ pcount <= pcount + 1;
+ end
+
+ //Heartbeat logic
+ phb_cnt <= phb_cnt + 1;
+
+ if ((phb_cnt < 3'd4) && (phb_cnt >= 3'd0)) begin
+ phb <= 1'b1;
+ end
+ else begin
+ phb <= 1'b0;
+ end
+
+ //Differential value logic
+ if (ppul_sync_p1 == 1'b1 && ppul_sync_p2 == 1'b0) begin
+ pcount_diff <= rcount_tc + ~(pcount) + 1;
+ end
+ else if (ppul_sync_p2 == 1'b1 && ppul_sync_p3 == 1'b0) begin
+ if (pcount_diff[21] == 1'b1) begin
+ pcount_diff <= ~(pcount_diff) + 1;
+ end
+ end
+ end
+end
+
+
+// =============================================================================
+// State transition logic for SLL FSM
+// =============================================================================
+always @(posedge sli_refclk or posedge sli_rst) begin
+ if (sli_rst == 1'b1) begin
+ sll_state <= LPLL_LOSS_ST;
+ end
+ else begin
+ //Reasons to declare an immediate loss - Absence of Tx_pclk, Dynamic rate change for SDI or CPRI
+ if ((rstat_pclk == 1'b0) || (rgear_p1^rgear == 1'b1) || (rdiv2_p1^rdiv2 == 1'b1) ||
+ (rdiv11_p1^rdiv11 == 1'b1) || (rcpri_mod_ch_p1^rcpri_mod_ch_p2 == 1'b1) || (rpcie_mode_p1^rpcie_mode == 1'b1)) begin
+ sll_state <= LPLL_LOSS_ST;
+ end
+ else begin
+ case(sll_state)
+ LPLL_LOSS_ST : begin
+ if (rtc_pul_p1 == 1'b1 && rtc_pul == 1'b0) begin
+ if (unlock) begin
+ sll_state <= LPLL_LOSS_ST;
+ end
+ else if (lock) begin
+ if (PLOL_SETTING == 2'd0) begin
+ sll_state <= LPLL_PRELOCK_ST;
+ end
+ else begin
+ sll_state <= LPLL_LOCK_ST;
+ end
+ end
+ end
+ end
+
+ LPLL_LOCK_ST : begin
+ if (rtc_pul_p1 == 1'b1 && rtc_pul == 1'b0) begin
+ if (lock) begin
+ sll_state <= LPLL_LOCK_ST;
+ end
+ else begin
+ if (PLOL_SETTING == 2'd0) begin
+ sll_state <= LPLL_LOSS_ST;
+ end
+ else begin
+ sll_state <= LPLL_PRELOSS_ST;
+ end
+ end
+ end
+ end
+
+ LPLL_PRELOCK_ST : begin
+ if (rtc_pul_p1 == 1'b1 && rtc_pul == 1'b0) begin
+ if (lock) begin
+ sll_state <= LPLL_LOCK_ST;
+ end
+ else begin
+ sll_state <= LPLL_PRELOSS_ST;
+ end
+ end
+ end
+
+ LPLL_PRELOSS_ST : begin
+ if (rtc_pul_p1 == 1'b1 && rtc_pul == 1'b0) begin
+ if (unlock) begin
+ sll_state <= LPLL_PRELOSS_ST;
+ end
+ else if (lock) begin
+ sll_state <= LPLL_LOCK_ST;
+ end
+ end
+ end
+
+ default: begin
+ sll_state <= LPLL_LOSS_ST;
+ end
+ endcase
+ end
+ end
+end
+
+
+// =============================================================================
+// Logic for Tx PLL Lock
+// =============================================================================
+always @(posedge sli_refclk or posedge sli_rst) begin
+ if (sli_rst == 1'b1) begin
+ pll_lock <= 1'b0;
+ end
+ else begin
+ case(sll_state)
+ LPLL_LOSS_ST : begin
+ pll_lock <= 1'b0;
+ end
+
+ LPLL_LOCK_ST : begin
+ pll_lock <= 1'b1;
+ end
+
+ LPLL_PRELOSS_ST : begin
+ pll_lock <= 1'b0;
+ end
+
+ default: begin
+ pll_lock <= 1'b0;
+ end
+ endcase
+ end
+end
+
+assign slo_plol = ~(pll_lock);
+
+endmodule
+
+
+// ===========================================================================
+// >>>>>>>>>>>>>>>>>>>>>>> COPYRIGHT NOTICE <<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<
+// ---------------------------------------------------------------------------
+// Copyright (c) 2015 by Lattice Semiconductor Corporation
+// ALL RIGHTS RESERVED
+// ------------------------------------------------------------------
+//
+// Permission:
+//
+// Lattice SG Pte. Ltd. grants permission to use this code
+// pursuant to the terms of the Lattice Reference Design License Agreement.
+//
+//
+// Disclaimer:
+//
+// This VHDL or Verilog source code is intended as a design reference
+// which illustrates how these types of functions can be implemented.
+// It is the user's responsibility to verify their design for
+// consistency and functionality through the use of formal
+// verification methods. Lattice provides no warranty
+// regarding the use or functionality of this code.
+//
+// ---------------------------------------------------------------------------
+//
+// Lattice SG Pte. Ltd.
+// 101 Thomson Road, United Square #07-02
+// Singapore 307591
+//
+//
+// TEL: 1-800-Lattice (USA and Canada)
+// +65-6631-2000 (Singapore)
+// +1-503-268-8001 (other locations)
+//
+// web: http://www.latticesemi.com/
+// email: techsupport@latticesemi.com
+//
+// ---------------------------------------------------------------------------
+//
+// =============================================================================
+// FILE DETAILS
+// Project : Synchronizer Logic
+// File : sync.v
+// Title : Synchronizer module
+// Description :
+// =============================================================================
+// REVISION HISTORY
+// Version : 1.0
+// Author(s) : AV
+// Mod. Date : July 7, 2015
+// Changes Made : Initial Creation
+// -----------------------------------------------------------------------------
+// Version : 1.1
+// Author(s) : EB
+// Mod. Date : March 21, 2017
+// Changes Made :
+// =============================================================================
+
+`ifndef PCS_SYNC_MODULE
+`define PCS_SYNC_MODULE
+module sync (
+ clk,
+ rst,
+ data_in,
+ data_out
+ );
+
+input clk; //Clock in which the async data needs to be synchronized to
+input rst; //Active high reset
+input data_in; //Asynchronous data
+output data_out; //Synchronized data
+
+parameter PDATA_RST_VAL = 0; //Reset value for the registers
+
+reg data_p1;
+reg data_p2;
+
+// =============================================================================
+// Synchronization logic
+// =============================================================================
+always @(posedge clk or posedge rst) begin
+ if (rst == 1'b1) begin
+ data_p1 <= PDATA_RST_VAL;
+ data_p2 <= PDATA_RST_VAL;
+ end
+ else begin
+ data_p1 <= data_in;
+ data_p2 <= data_p1;
+ end
+end
+
+assign data_out = data_p2;
+
+endmodule
+`endif
+

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