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[/] [pcie_ds_dma/] [trunk/] [core/] [ds_dma64/] [pcie_src/] [pcie_core64_m1/] [source/] [pcie_reset_logic.v] - Rev 15
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//----------------------------------------------------------------------------- // // (c) Copyright 2009-2010 Xilinx, Inc. All rights reserved. // // This file contains confidential and proprietary information // of Xilinx, Inc. and is protected under U.S. and // international copyright and other intellectual property // laws. // // DISCLAIMER // This disclaimer is not a license and does not grant any // rights to the materials distributed herewith. Except as // otherwise provided in a valid license issued to you by // Xilinx, and to the maximum extent permitted by applicable // law: (1) THESE MATERIALS ARE MADE AVAILABLE "AS IS" AND // WITH ALL FAULTS, AND XILINX HEREBY DISCLAIMS ALL WARRANTIES // AND CONDITIONS, EXPRESS, IMPLIED, OR STATUTORY, INCLUDING // BUT NOT LIMITED TO WARRANTIES OF MERCHANTABILITY, NON- // INFRINGEMENT, OR FITNESS FOR ANY PARTICULAR PURPOSE; and // (2) Xilinx shall not be liable (whether in contract or tort, // including negligence, or under any other theory of // liability) for any loss or damage of any kind or nature // related to, arising under or in connection with these // materials, including for any direct, or any indirect, // special, incidental, or consequential loss or damage // (including loss of data, profits, goodwill, or any type of // loss or damage suffered as a result of any action brought // by a third party) even if such damage or loss was // reasonably foreseeable or Xilinx had been advised of the // possibility of the same. // // CRITICAL APPLICATIONS // Xilinx products are not designed or intended to be fail- // safe, or for use in any application requiring fail-safe // performance, such as life-support or safety devices or // systems, Class III medical devices, nuclear facilities, // applications related to the deployment of airbags, or any // other applications that could lead to death, personal // injury, or severe property or environmental damage // (individually and collectively, "Critical // Applications"). Customer assumes the sole risk and // liability of any use of Xilinx products in Critical // Applications, subject only to applicable laws and // regulations governing limitations on product liability. // // THIS COPYRIGHT NOTICE AND DISCLAIMER MUST BE RETAINED AS // PART OF THIS FILE AT ALL TIMES. // //----------------------------------------------------------------------------- // Project : V5-Block Plus for PCI Express // File : pcie_reset_logic.v //-------------------------------------------------------------------------------- //-------------------------------------------------------------------------------- // // ____ ____ // / /\/ / // /___/ \ / Vendor : Xilinx // \ \ \/ Version : 1.1 // \ \ Application : Generated by Xilinx PCI Express Wizard // / / Filename : pcie_reset_logic.v // /___/ /\ Module : reset_logic // \ \ / \ // \___\/\___\ // //------------------------------------------------------------------------------ module reset_logic ( L0DLUPDOWN, GSR, CRMCORECLK, USERCLK, L0LTSSMSTATE, L0STATSCFGTRANSMITTED, CRMDOHOTRESETN, CRMPWRSOFTRESETN, CRMMGMTRSTN, CRMNVRSTN, CRMMACRSTN, CRMLINKRSTN, CRMURSTN, CRMUSERCFGRSTN, user_master_reset_n, clock_ready ); input L0DLUPDOWN; input GSR; input CRMCORECLK; input USERCLK; input [3:0] L0LTSSMSTATE; input L0STATSCFGTRANSMITTED; input CRMDOHOTRESETN; input CRMPWRSOFTRESETN; output CRMMGMTRSTN; output CRMNVRSTN; output CRMMACRSTN; output CRMLINKRSTN; output CRMURSTN; output CRMUSERCFGRSTN; input user_master_reset_n; input clock_ready; parameter G_RESETMODE = "FALSE"; parameter G_RESETSUBMODE = 1; parameter G_USE_EXTRA_REG = 1; // Common logic for all reset mode wire fpga_logic_reset_n; assign fpga_logic_reset_n = ~GSR && user_master_reset_n; // L0DLUPDOWN[0] capture reg dl_down_1, dl_down_2; reg dl_down_reset_1_n, dl_down_reset_2_n; reg dl_down_reset_n; reg crm_pwr_soft_reset_n_aftersentcpl; reg softreset_wait_for_cpl; reg crmpwrsoftresetn_d; reg l0statscfgtransmitted_d; wire crmpwrsoftresetn_fell; always @ (posedge CRMCORECLK, negedge fpga_logic_reset_n) if (!fpga_logic_reset_n) begin dl_down_1 <= 1'b1; dl_down_2 <= 1'b1; end else begin dl_down_1 <= L0DLUPDOWN; dl_down_2 <= dl_down_1; end // Edge detect and pulse stretch to create dl_down_reset_n pulse // The pulse can be further stretched for debugging purpose by adding // more register stages. always @ (posedge CRMCORECLK, negedge fpga_logic_reset_n) if (!fpga_logic_reset_n) begin dl_down_reset_1_n <= 1'b1; dl_down_reset_2_n <= 1'b1; dl_down_reset_n <= 1'b1; end else begin dl_down_reset_1_n <= ~(~dl_down_1 & dl_down_2); dl_down_reset_2_n <= dl_down_reset_1_n; dl_down_reset_n <= dl_down_reset_1_n && dl_down_reset_2_n; end // This logic ensures that if we get a D3->D0 transition (which triggers // soft_reset), then we will not reset until the Cpl is generated // Wait for CRMPWRSOFTRESETN to assert to indicate this condition, and pulse // CRMUSERCFGRSTN once the Cfg Cpl exits (L0STATSCFGTRANSMITTED). It is // possible for L0STATSCFGTRANSMITTED to occur simultaneously or one cycle // before CRMPWRSOFTRESETN asserts. always @ (posedge USERCLK, negedge fpga_logic_reset_n) if (!fpga_logic_reset_n) softreset_wait_for_cpl <= 1'b0; else if (crmpwrsoftresetn_fell && !L0STATSCFGTRANSMITTED && !l0statscfgtransmitted_d) softreset_wait_for_cpl <= 1'b1; else if (L0STATSCFGTRANSMITTED) softreset_wait_for_cpl <= 1'b0; always @ (posedge USERCLK, negedge fpga_logic_reset_n) if (!fpga_logic_reset_n) begin crm_pwr_soft_reset_n_aftersentcpl <= 1'b1; crmpwrsoftresetn_d <= 1'b1; l0statscfgtransmitted_d <= 1'b0; end else begin crm_pwr_soft_reset_n_aftersentcpl <= !((softreset_wait_for_cpl && L0STATSCFGTRANSMITTED) || (!CRMPWRSOFTRESETN && L0STATSCFGTRANSMITTED) || (!CRMPWRSOFTRESETN && l0statscfgtransmitted_d)); crmpwrsoftresetn_d <= CRMPWRSOFTRESETN; l0statscfgtransmitted_d <= L0STATSCFGTRANSMITTED; end assign crmpwrsoftresetn_fell = !CRMPWRSOFTRESETN && crmpwrsoftresetn_d; // End common logic section generate if (G_RESETMODE == "TRUE") begin : resetmode_true // 6-domain reset mode (RESETMODE=TRUE) if (G_RESETSUBMODE == 0) begin : sub_0_mode_true // a. user_master_reset_n is used to drive CRMMGMTRSTN assign CRMMGMTRSTN = clock_ready && user_master_reset_n; assign CRMNVRSTN = 1'b1; assign CRMMACRSTN = 1'b1; assign CRMLINKRSTN = dl_down_reset_n && CRMDOHOTRESETN; assign CRMURSTN = dl_down_reset_n && CRMDOHOTRESETN; assign CRMUSERCFGRSTN = dl_down_reset_n && CRMDOHOTRESETN && crm_pwr_soft_reset_n_aftersentcpl; end else begin : sub_1_mode_true //b. user_master_reset_n is used but does not drive CRMMGMTRSTN assign CRMMGMTRSTN = clock_ready; assign CRMNVRSTN = user_master_reset_n; assign CRMMACRSTN = user_master_reset_n; assign CRMLINKRSTN = user_master_reset_n && dl_down_reset_n && CRMDOHOTRESETN; assign CRMURSTN = user_master_reset_n && dl_down_reset_n && CRMDOHOTRESETN; assign CRMUSERCFGRSTN = user_master_reset_n && dl_down_reset_n && CRMDOHOTRESETN && crm_pwr_soft_reset_n_aftersentcpl; end // End 6-domain reset mode logic end endgenerate generate if (G_RESETMODE == "FALSE") begin : resetmode_false // 4-domain hierarchical reset mode (RESETMODE=FALSE) // This mode requires decoding the L0LTSSMSTATE outputs // from the PCIe block to detect LTSSM transition from Disabled // (1011), Loopback (1001) or Hot Reset (1010) to Detect (0001). wire ltssm_linkdown_hot_reset_n; reg ltssm_dl_down_last_state; reg [3:0] ltssm_capture; reg crmpwrsoftresetn_capture; reg ltssm_linkdown_hot_reset_reg_n; // Use with G_USE_EXTRA_REG == 1 for better timing always @ (posedge CRMCORECLK) begin ltssm_capture <= L0LTSSMSTATE; //crmpwrsoftresetn_capture <= CRMPWRSOFTRESETN; crmpwrsoftresetn_capture <= crm_pwr_soft_reset_n_aftersentcpl; ltssm_linkdown_hot_reset_reg_n <= ltssm_linkdown_hot_reset_n; end always @ (posedge CRMCORECLK, negedge fpga_logic_reset_n) begin if (G_USE_EXTRA_REG == 1) begin if (!fpga_logic_reset_n) begin ltssm_dl_down_last_state <= 1'b0; end else if ((ltssm_capture == 4'b1010) || (ltssm_capture == 4'b1001) || (ltssm_capture == 4'b1011) || (ltssm_capture == 4'b1100) || (ltssm_capture == 4'b0011)) begin ltssm_dl_down_last_state <= 1'b1; end else begin ltssm_dl_down_last_state <= 1'b0; end end else begin if (!fpga_logic_reset_n) begin ltssm_dl_down_last_state <= 1'b0; end else if ((L0LTSSMSTATE == 4'b1010) || (L0LTSSMSTATE == 4'b1001) || (L0LTSSMSTATE == 4'b1011) || (L0LTSSMSTATE == 4'b1100) || (L0LTSSMSTATE == 4'b0011)) begin ltssm_dl_down_last_state <= 1'b1; end else begin ltssm_dl_down_last_state <= 1'b0; end end end assign ltssm_linkdown_hot_reset_n = (G_USE_EXTRA_REG == 1) ? ~(ltssm_dl_down_last_state && (ltssm_capture[3:1] == 3'b000)) : ~(ltssm_dl_down_last_state && (L0LTSSMSTATE[3:1] == 3'b000)); if (G_RESETSUBMODE == 0) begin : sub_0_mode_false // a. user_master_reset_n is used to drive CRMMGMTRSTN assign CRMMGMTRSTN = clock_ready && user_master_reset_n; assign CRMNVRSTN = 1'b1; assign CRMURSTN = (G_USE_EXTRA_REG == 1) ? ltssm_linkdown_hot_reset_reg_n : ltssm_linkdown_hot_reset_n; assign CRMUSERCFGRSTN = (G_USE_EXTRA_REG == 1) ? crmpwrsoftresetn_capture : crm_pwr_soft_reset_n_aftersentcpl; assign CRMMACRSTN = 1'b1; // not used, just avoiding 'z' in simulation assign CRMLINKRSTN = 1'b1; // not used, just avoiding 'z' in simulation end else begin : sub_1_mode_false // b. user_master_reset_n is used but does not drive CRMMGMTRSTN assign CRMMGMTRSTN = clock_ready; assign CRMNVRSTN = user_master_reset_n; assign CRMURSTN = (G_USE_EXTRA_REG == 1) ? ltssm_linkdown_hot_reset_reg_n : ltssm_linkdown_hot_reset_n; assign CRMUSERCFGRSTN = (G_USE_EXTRA_REG == 1) ? crmpwrsoftresetn_capture : crm_pwr_soft_reset_n_aftersentcpl; assign CRMMACRSTN = 1'b1; // not used, just avoiding 'z' in simulation assign CRMLINKRSTN = 1'b1; // not used, just avoiding 'z' in simulation end // End 4-domain hierarchical reset mode logic end endgenerate endmodule
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