diff options
Diffstat (limited to 'clarity/pcs/sgmii0/sgmii0_softlogic.v')
| -rw-r--r-- | clarity/pcs/sgmii0/sgmii0_softlogic.v | 1060 |
1 files changed, 1060 insertions, 0 deletions
diff --git a/clarity/pcs/sgmii0/sgmii0_softlogic.v b/clarity/pcs/sgmii0/sgmii0_softlogic.v new file mode 100644 index 0000000..74972ff --- /dev/null +++ b/clarity/pcs/sgmii0/sgmii0_softlogic.v @@ -0,0 +1,1060 @@ + +// =========================================================================== +// >>>>>>>>>>>>>>>>>>>>>>> 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 sgmii0sll_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 + |