altera_2.v

本程序对如何使用altera系列芯片片上ram进行实例演示

                else if (ipower_up == 1) // "high"
                    iregout <= 'b1;
            end
            else if (devclrn == 'b0)
                iregout <= 'b0;
            else if (iaclr === 'b1) 
                iregout <= 'b0 ;
            else if (iaload === 'b1) 
                iregout <= idatac;
            else if (iena === 'b1 && clk_in === 'b1 && 
                     clk_last_value === 'b0)
            begin
                if (isynch_mode == 1)
                begin
                    if (isclr === 'b1)
                        iregout <= 'b0 ;
                    else if (isload === 'b1)
                        iregout <= idatac;
                    else if (icascade_mode == 1)
                        iregout <= iregcascin;
                    else
                        iregout <= idatain;
                end
                else if (icascade_mode == 1)
                    iregout <= iregcascin;
                else 
                    iregout <= idatain;
            end
        end
        clk_last_value = clk_in;
    end
       
    and (regout, iregout, 1'b1);
    and (qfbkout, iregout, 1'b1);
   
endmodule

///////////////////////////////////////////////////////////////////////
//
// Module Name : cyclone_lcell
//
// Description : Verilog simulation model for Cyclone Lcell, including
//               the following sub module(s):
//               1. cyclone_asynch_lcell
//               2. cyclone_lcell_register
//
///////////////////////////////////////////////////////////////////////

`timescale 1 ps/1 ps

module cyclone_lcell (
                      clk, 
                      dataa, 
                      datab, 
                      datac, 
                      datad, 
                      aclr, 
                      aload, 
                      sclr,
                      sload,
                      ena,
                      cin,
                      cin0,
                      cin1,
                      inverta,
                      regcascin,
                      devclrn,
                      devpor,
                      combout,
                      regout,
                      cout, 
                      cout0,
                      cout1
                     );

    parameter operation_mode = "normal" ;
    parameter synch_mode = "off";
    parameter register_cascade_mode = "off";
    parameter sum_lutc_input = "datac";
    parameter lut_mask = "ffff" ;
    parameter power_up = "low";
    parameter cin_used = "false";
    parameter cin0_used = "false";
    parameter cin1_used = "false";
    parameter output_mode = "comb_only";
    parameter lpm_type = "cyclone_lcell";
    parameter x_on_violation = "on";
       
    // INPUT PORTS
    input dataa;
    input datab;
    input datac;
    input datad;
    input clk; 
    input aclr; 
    input aload; 
    input sclr; 
    input sload; 
    input ena; 
    input cin;
    input cin0;
    input cin1;
    input inverta;
    input regcascin;
    input devclrn;
    input devpor ;
    
    // OUTPUT PORTS
    output combout;
    output regout;
    output cout;
    output cout0;
    output cout1;
    
    // INTERNAL VARIABLES
    wire dffin, qfbkin;
   
    cyclone_asynch_lcell lecomb (
                                 .dataa(dataa),
                                 .datab(datab), 
                                 .datac(datac),
                                 .datad(datad),
                                 .cin(cin),
                                 .cin0(cin0),
                                 .cin1(cin1), 
                                 .inverta(inverta),
                                 .qfbkin(qfbkin),
                                 .regin(dffin),
                                 .combout(combout),
                                 .cout(cout),
                                 .cout0(cout0),
                                 .cout1(cout1)
                                );
        defparam lecomb.operation_mode = operation_mode;
        defparam lecomb.sum_lutc_input = sum_lutc_input;
        defparam lecomb.cin_used = cin_used;
        defparam lecomb.cin0_used = cin0_used;
        defparam lecomb.cin1_used = cin1_used;
        defparam lecomb.lut_mask = lut_mask;
       
    cyclone_lcell_register lereg (
                                  .clk(clk),
                                  .aclr(aclr),
                                  .aload(aload),
                                  .sclr(sclr),
                                  .sload(sload),
                                  .ena(ena), 
                                  .datain(dffin), 
                                  .datac(datac),
                                  .regcascin(regcascin),
                                  .devclrn(devclrn),
                                  .devpor(devpor), 
                                  .regout(regout),
                                  .qfbkout(qfbkin)
                                 );
        defparam lereg.synch_mode = synch_mode;
        defparam lereg.register_cascade_mode = register_cascade_mode;
        defparam lereg.power_up = power_up;
        defparam lereg.x_on_violation = x_on_violation;
   
endmodule



//--------------------------------------------------------------------------
// Module Name     : cyclone_ram_pulse_generator
// Description     : Generate pulse to initiate memory read/write operations
//--------------------------------------------------------------------------

`timescale 1 ps/1 ps

module cyclone_ram_pulse_generator (
                                    clk,     
                                    ena,     
                                    pulse,
                                    cycle    
                                   );
input  clk;   // clock
input  ena;   // pulse enable
output pulse; // pulse
output cycle; // delayed clock

reg  state;
wire clk_ipd;

specify
    specparam t_decode = 0,t_access = 0;
    (posedge clk => (pulse +: state)) = (t_decode,t_access);
endspecify

buf #(1) (clk_ipd,clk);
wire  pulse_opd;

buf buf_pulse  (pulse,pulse_opd);

always @(posedge clk_ipd or posedge pulse) 
begin
    if      (pulse) state <= 1'b0;
    else if (ena)   state <= 1'b1;
end

assign cycle = clk_ipd;
assign pulse_opd = state; 

endmodule

//--------------------------------------------------------------------------
// Module Name     : cyclone_ram_register
// Description     : Register module for RAM inputs/outputs
//--------------------------------------------------------------------------

`timescale 1 ps/1 ps

module cyclone_ram_register (
                             d,
                             clk,
                             aclr,
                             devclrn,
                             devpor,
                             ena,
                             q,
                             aclrout
                            );
                            
parameter width = 1;      // data width
parameter preset = 1'b0;  // clear acts as preset

input [width - 1:0] d;    // data
input clk;                // clock
input aclr;               // asynch clear
input devclrn,devpor;     // device wide clear/reset
input ena;                // clock enable
output [width - 1:0] q;   // register output
output aclrout;           // delayed asynch clear

wire ena_ipd;
wire clk_ipd;
wire aclr_ipd;
wire [width - 1:0] d_ipd;

buf buf_ena (ena_ipd,ena);
buf buf_clk (clk_ipd,clk);
buf buf_aclr (aclr_ipd,aclr);
buf buf_d [width - 1:0] (d_ipd,d);

wire  [width - 1:0] q_opd;

buf buf_q  [width - 1:0] (q,q_opd);
reg   [width - 1:0] q_reg;

reg viol_notifier;
wire reset;

assign reset = devpor && devclrn && (!aclr_ipd) && (ena_ipd);
specify
      $setup  (d,    posedge clk &&& reset, 0, viol_notifier);
      $setup  (aclr, posedge clk, 0, viol_notifier);
      $setup  (ena,  posedge clk &&& reset, 0, viol_notifier );
      $hold   (posedge clk &&& reset, d   , 0, viol_notifier);
      $hold   (posedge clk, aclr, 0, viol_notifier);
      $hold   (posedge clk &&& reset, ena , 0, viol_notifier );
      (posedge clk =>  (q +: q_reg)) = (0,0);
      (posedge aclr => (q +: q_reg)) = (0,0);
endspecify

initial q_reg <= (preset) ? {width{1'b1}} : 'b0;

always @(posedge clk_ipd or posedge aclr_ipd or negedge devclrn or negedge devpor)
begin
    if (aclr_ipd || ~devclrn || ~devpor) 
        q_reg <= (preset) ? {width{1'b1}} : 'b0;
       else if (ena_ipd)
        q_reg <= d_ipd;
end
assign aclrout = aclr_ipd;

assign q_opd = q_reg; 

endmodule

`timescale 1 ps/1 ps

`define PRIME 1
`define SEC   0

//--------------------------------------------------------------------------
// Module Name     : cyclone_ram_block
// Description     : Main RAM module
//--------------------------------------------------------------------------

module cyclone_ram_block 
    (
     portadatain, 
     portaaddr, 
     portawe, 
     portbdatain, 
     portbaddr, 
     portbrewe, 
     clk0, clk1, 
     ena0, ena1, 
     clr0, clr1,
     portabyteenamasks, 
     portbbyteenamasks,
     devclrn,
     devpor,
     portadataout, 
     portbdataout
     );
// -------- GLOBAL PARAMETERS ---------
parameter operation_mode = "single_port";
parameter mixed_port_feed_through_mode = "dont_care";
parameter ram_block_type = "auto"; 
parameter logical_ram_name = "ram_name"; 

parameter init_file = "init_file.hex"; 
parameter init_file_layout = "none";

parameter data_interleave_width_in_bits = 1;
parameter data_interleave_offset_in_bits = 1;
parameter port_a_logical_ram_depth = 0;
parameter port_a_logical_ram_width = 0;
parameter port_a_first_address = 0;
parameter port_a_last_address = 0;
parameter port_a_first_bit_number = 0;
   
parameter port_a_data_in_clear = "none";
parameter port_a_address_clear = "none";
parameter port_a_write_enable_clear = "none";
parameter port_a_data_out_clear = "none";
parameter port_a_byte_enable_clear = "none";

parameter port_a_data_in_clock = "clock0";
parameter port_a_address_clock = "clock0";
parameter port_a_write_enable_clock = "clock0";
parameter port_a_byte_enable_clock = "clock0";

parameter port_a_data_out_clock = "none";

parameter port_a_data_width = 1;
parameter port_a_address_width = 1; 
parameter port_a_byte_enable_mask_width = 1; 

parameter port_b_logical_ram_depth = 0;
parameter port_b_logical_ram_width = 0;
parameter port_b_first_address = 0;
parameter port_b_last_address = 0;
parameter port_b_first_bit_number = 0;

parameter port_b_data_in_clear = "none";
parameter port_b_address_clear = "none";
parameter port_b_read_enable_write_enable_clear = "none";
parameter port_b_byte_enable_clear = "none";
parameter port_b_data_out_clear = "none";
   
parameter port_b_data_in_clock = "clock0";
parameter port_b_address_clock = "clock0";
parameter port_b_read_enable_write_enable_clock = "clock0";
parameter port_b_byte_enable_clock = "none";
parameter port_b_data_out_clock = "none";

parameter port_b_data_width = 1;
parameter port_b_address_width = 1; 
parameter port_b_byte_enable_mask_width = 1; 

parameter power_up_uninitialized = "false";
parameter lpm_type = "cyclone_ram_block";
parameter connectivity_checking = "off";

parameter mem_init0 = 2048'b0;
parameter mem_init1 = 2560'b0;


// -------- LOCAL PARAMETERS ---------
parameter primary_port_is_a  = (port_b_data_width <= port_a_data_width) ? 1'b1 : 1'b0;
parameter primary_port_is_b  = ~primary_port_is_a;

parameter mode_is_rom_or_sp  = ((operation_mode == "rom") || (operation_mode == "single_port")) ? 1'b1 : 1'b0;
parameter data_width         = (primary_port_is_a) ? port_a_data_width : port_b_data_width;
parameter data_unit_width    = (mode_is_rom_or_sp | primary_port_is_b) ? port_a_data_width : port_b_data_width;
parameter address_width      = (mode_is_rom_or_sp | primary_port_is_b) ? port_a_address_width : port_b_address_width;
parameter address_unit_width = (mode_is_rom_or_sp | primary_port_is_a) ? port_a_address_width : port_b_address_width;
parameter wired_mode         = ((port_a_address_width == 1) && (port_a_address_width == port_b_address_width)
                                                            && (port_a_data_width != port_b_data_width));

parameter num_rows = 1 << address_unit_width;
parameter num_cols = (mode_is_rom_or_sp) ? 1 : ( wired_mode ? 2 :
                      ( (primary_port_is_a) ?
                      1 << (port_b_address_width - port_a_address_width) :
                      1 << (port_a_address_width - port_b_address_width) ) ) ;
    
parameter mask_width_prime = (primary_port_is_a) ?
                              port_a_byte_enable_mask_width : port_b_byte_enable_mask_width;
parameter mask_width_sec   = (primary_port_is_a) ?
                              port_b_byte_enable_mask_width : port_a_byte_enable_mask_width;

parameter byte_size_a = port_a_data_width/port_a_byte_enable_mask_width;
parameter byte_size_b = port_b_data_width/port_b_byte_enable_mask_width;

parameter mode_is_dp  = (operation_mode == "dual_port") ? 1'b1 : 1'b0;

// -------- PORT DECLARATIONS ---------
input portawe;
input [port_a_data_width - 1:0] portadatain;
input [port_a_address_width - 1:0] portaaddr;
input [port_a_byte_enable_mask_width - 1:0] portabyteenamasks;
 
input portbrewe;
input [port_b_data_width - 1:0] portbdatain;
input [port_b_address_width - 1:0] portbaddr;
input [port_b_byte_enable_mask_width - 1:0] portbbyteenamasks; 

input clr0,clr1;
input clk0,clk1;
input ena0,ena1;

input devclrn,devpor;
output [port_a_data_width - 1:0] portadataout;
output [port_b_data_width - 1:0] portbdataout;