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// ============================================================================

//        __

//   \\__/ o\    (C) 2018-2023  Robert Finch, Waterloo

//    \  __ /    All rights reserved.

//     \/_//     robfinch@finitron.ca

//       ||

//

//

// BSD 3-Clause License

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// modification, are permitted provided that the following conditions are met:

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// 1. Redistributions of source code must retain the above copyright notice, this

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// ============================================================================

//

`define VENDOR_XILINX

module rfTextScreenRam(clka_i, csa_i, wea_i, sela_i, adra_i, data_i, data_o,

        clkb_i, csb_i, web_i, selb_i, adrb_i, datb_i, datb_o);

input clka_i;

input csa_i;

input wea_i;

input [7:0] sela_i;

input [16:3] adra_i;

input [63:0] data_i;

output [63:0] data_o;

input clkb_i;

input csb_i;

input web_i;

input [7:0] selb_i;

input [16:3] adrb_i;

input [63:0] datb_i;

output [63:0] datb_o;

parameter TEXT_CELL_COUNT = 16384;

localparam AWID = $clog2(TEXT_CELL_COUNT);

// xpm_memory_tdpram: True Dual Port RAM

// Xilinx Parameterized Macro, version 2020.2

`ifdef VENDOR_XILINX

        xpm_memory_tdpram #(

          .ADDR_WIDTH_A(AWID),

          .ADDR_WIDTH_B(AWID),

          .AUTO_SLEEP_TIME(0),

          .BYTE_WRITE_WIDTH_A(8),

          .BYTE_WRITE_WIDTH_B(8),

          .CASCADE_HEIGHT(0),

          .CLOCKING_MODE("independent_clock"), // String

          .ECC_MODE("no_ecc"),            // String

          .MEMORY_INIT_FILE("none"),                    // String

          .MEMORY_INIT_PARAM("0"),        // String

          .MEMORY_OPTIMIZATION("true"),   // String

          .MEMORY_PRIMITIVE("block"),      // String

          .MEMORY_SIZE(TEXT_CELL_COUNT*64),

          .MESSAGE_CONTROL(0),

          .READ_DATA_WIDTH_A(64),

          .READ_DATA_WIDTH_B(64),

          .READ_LATENCY_A(2),

          .READ_LATENCY_B(1),

          .READ_RESET_VALUE_A("0"),       // String

          .READ_RESET_VALUE_B("0"),       // String

          .RST_MODE_A("SYNC"),            // String

          .RST_MODE_B("SYNC"),            // String

          .SIM_ASSERT_CHK(0),             // DECIMAL; 0=disable simulation messages, 1=enable simulation messages

          .USE_EMBEDDED_CONSTRAINT(0),    // DECIMAL

          .USE_MEM_INIT(1),

          .WAKEUP_TIME("disable_sleep"),  // String

          .WRITE_DATA_WIDTH_A(64),

          .WRITE_DATA_WIDTH_B(64),

          .WRITE_MODE_A("no_change"),     // String

          .WRITE_MODE_B("no_change")      // String

        )

        xpm_memory_tdpram_inst (

          .dbiterra(),             // 1-bit output: Status signal to indicate double bit error occurrence

                                           // on the data output of port A.

          .dbiterrb(),             // 1-bit output: Status signal to indicate double bit error occurrence

                                           // on the data output of port A.

          .douta(data_o),          // READ_DATA_WIDTH_A-bit output: Data output for port A read operations.

          .doutb(datb_o),          // READ_DATA_WIDTH_B-bit output: Data output for port B read operations.

          .sbiterra(),             // 1-bit output: Status signal to indicate single bit error occurrence

                                           // on the data output of port A.

          .sbiterrb(),             // 1-bit output: Status signal to indicate single bit error occurrence

                                           // on the data output of port B.

          .addra(adra_i),                   // ADDR_WIDTH_A-bit input: Address for port A write and read operations.

          .addrb(adrb_i),               // ADDR_WIDTH_B-bit input: Address for port B write and read operations.

          .clka(clka_i),                   // 1-bit input: Clock signal for port A. Also clocks port B when

                                           // parameter CLOCKING_MODE is "common_clock".

          .clkb(clkb_i),               // 1-bit input: Clock signal for port B when parameter CLOCKING_MODE is

                                           // "independent_clock". Unused when parameter CLOCKING_MODE is

                                           // "common_clock".

          .dina(data_i),                     // WRITE_DATA_WIDTH_A-bit input: Data input for port A write operations.

          .dinb(datb_i),                  // WRITE_DATA_WIDTH_B-bit input: Data input for port B write operations.

          .ena(csa_i),                       // 1-bit input: Memory enable signal for port A. Must be high on clock

                                           // cycles when read or write operations are initiated. Pipelined

                                           // internally.

          .enb(csb_i),                       // 1-bit input: Memory enable signal for port B. Must be high on clock

                                           // cycles when read or write operations are initiated. Pipelined

                                           // internally.

          .injectdbiterra(1'b0), // 1-bit input: Controls double bit error injection on input data when

                                           // ECC enabled (Error injection capability is not available in

                                           // "decode_only" mode).

          .injectdbiterrb(1'b0), // 1-bit input: Controls double bit error injection on input data when

                                           // ECC enabled (Error injection capability is not available in

                                           // "decode_only" mode).

          .injectsbiterra(1'b0), // 1-bit input: Controls single bit error injection on input data when

                                           // ECC enabled (Error injection capability is not available in

                                           // "decode_only" mode).

          .injectsbiterrb(1'b0), // 1-bit input: Controls single bit error injection on input data when

                                           // ECC enabled (Error injection capability is not available in

                                           // "decode_only" mode).

          .regcea(csa_i),                 // 1-bit input: Clock Enable for the last register stage on the output

                                           // data path.

          .regceb(csb_i),                 // 1-bit input: Clock Enable for the last register stage on the output

                                           // data path.

          .rsta(1'b0),                     // 1-bit input: Reset signal for the final port A output register stage.

                                           // Synchronously resets output port douta to the value specified by

                                           // parameter READ_RESET_VALUE_A.

          .rstb(1'b0),                     // 1-bit input: Reset signal for the final port B output register stage.

                                           // Synchronously resets output port doutb to the value specified by

                                           // parameter READ_RESET_VALUE_B.

          .sleep(1'b0),                   // 1-bit input: sleep signal to enable the dynamic power saving feature.

          .wea({8{wea_i}} & sela_i),                                                            // WRITE_DATA_WIDTH_A/BYTE_WRITE_WIDTH_A-bit input: Write enable vector

                                           // for port A input data port dina. 1 bit wide when word-wide writes are

                                           // used. In byte-wide write configurations, each bit controls the

                                           // writing one byte of dina to address addra. For example, to

                                           // synchronously write only bits [15-8] of dina when WRITE_DATA_WIDTH_A

                                           // is 32, wea would be 4'b0010.

          .web({8{web_i}} & selb_i)        // WRITE_DATA_WIDTH_B/BYTE_WRITE_WIDTH_B-bit input: Write enable vector

                                           // for port B input data port dinb. 1 bit wide when word-wide writes are

                                           // used. In byte-wide write configurations, each bit controls the

                                           // writing one byte of dinb to address addrb. For example, to

                                           // synchronously write only bits [15-8] of dinb when WRITE_DATA_WIDTH_B

                                           // is 32, web would be 4'b0010.

        );

`elsif VENDOR_ALTERA

        always_comb

        begin

                $display("ToDo: Add ALTERA RAM support.");

                $finish();

        end

`else

        always_comb

        begin

                $display("No RAM vendor selected.");

                $finish();

        end

`endif

endmodule