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        --! @file memblock.vhd

--! @brief Bloque de memoria. 

--! @author Julián Andrés Guarín Reyes

--------------------------------------------------------------

-- RAYTRAC

-- Author Julian Andres Guarin

-- memblock.vhd

-- This file is part of raytrac.

-- 

--     raytrac is free software: you can redistribute it and/or modify

--     it under the terms of the GNU General Public License as published by

--     the Free Software Foundation, either version 3 of the License, or

--     (at your option) any later version.

-- 

--     raytrac is distributed in the hope that it will be useful,

--     but WITHOUT ANY WARRANTY; without even the implied warranty of

--     MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the

--     GNU General Public License for more details.

-- 

--     You should have received a copy of the GNU General Public License

--     along with raytrac.  If not, see <http://www.gnu.org/licenses/>.

library ieee;

use ieee.std_logic_1164.all;

entity memblock is

        generic (

                width : integer := 32;

                blocksize : integer := 512;

                widthadmemblock : integer :=9;

                external_writeable_blocks : integer := 12;

                external_readable_blocks  : integer := 8;

                external_readable_widthad       : integer := 3;

                external_writeable_widthad      : integer := 4

        );

        port (

                clk,ena,dpfifo_flush,normfifo_flush,dpfifo_rd,normfifo_rd,dpfifo_wr,normfifo_wr : in std_logic;

                dpfifo_empty, normfifo_empty, dpfifo_full, normfifo_full : out std_logic;

                instrfifo_flush,instrfifo_rd,instrfifo_wr,resultfifo_flush,resultfifo_wr: in std_logic;

                instrfifo_empty,instrfifo_full: out std_logic;

                ext_rd,ext_wr: in std_logic;

                ext_wr_add : in std_logic_vector(external_writeable_widthad+widthadmemblock-1 downto 0);

                ext_rd_add : in std_logic_vector(external_readable_widthad-1 downto 0);

                ext_d: in std_logic_vector(width-1 downto 0);

                resultfifo_full,resultfifo_empty : out std_logic_vector(external_readable_blocks-1 downto 0);

                int_d : in std_logic_vector(external_readable_blocks*width-1 downto 0);

                ext_q,instrfifo_q : out std_logic_vector(width-1 downto 0);

                int_q : out std_logic_vector(external_writeable_blocks*width-1 downto 0);

                int_rd_add : in std_logic_vector(2*widthadmemblock-1 downto 0);

                instrfifo_d : in std_logic_vector(width-1 downto 0);

                dpfifo_d : in std_logic_vector(width*2-1 downto 0);

                normfifo_d : in std_logic_vector(width*3-1 downto 0);

                dpfifo_q : out std_logic_vector(width*2-1 downto 0);

                normfifo_q : out std_logic_vector(width*3-1 downto 0)

        );

end memblock;

architecture memblock_arch of memblock is

        type    vectorblock12 is array (11 downto 0) of std_logic_vector(width-1 downto 0);

        type    vectorblock08 is array (07 downto 0) of std_logic_vector(width-1 downto 0);

        type    vectorblock02 is array (01 downto 0) of std_logic_vector(widthadmemblock-1 downto 0);

        component scfifo

        generic (

                add_ram_output_register :string;

                almost_full_value               :natural;

                allow_wrcycle_when_full :string;

                intended_device_family  :string;

                lpm_hint                                :string;

                lpm_numwords                    :natural;

                lpm_showahead                   :string;

                lpm_type                                :string;

                lpm_width                               :natural;

                lpm_widthu                              :natural;

                overflow_checking               :string;

                underflow_checking              :string;

                use_eab                                 :string

        );

        port(

                rdreq           : in std_logic;

                aclr            : in std_logic;

                empty           : out std_logic;

                clock           : in std_logic;

                q                       : out std_logic_vector(lpm_width-1 downto 0);

                wrreq           : in std_logic;

                data            : in std_logic_vector(lpm_width-1 downto 0);

                almost_full : out std_logic;

                full            : out std_logic

        );

        end component;

        component altsyncram

        generic (

                address_aclr_b                  : string;

                address_reg_b                   : string;

                clock_enable_input_a    : string;

                clock_enable_input_b    : string;

                clock_enable_output_b   : string;

                intended_device_family  : string;

                lpm_type                                : string;

                numwords_a                              : natural;

                numwords_b                              : natural;

                operation_mode                  : string;

                outdata_aclr_b                  : string;

                outdata_reg_b                   : string;

                power_up_uninitialized  : string;

                ram_block_type                  : string;

                rdcontrol_reg_b                 : string;

                read_during_write_mode_mixed_ports      : string;

                widthad_a                               : natural;

                widthad_b                               : natural;

                width_a                                 : natural;

                width_b                                 : natural;

                width_byteena_a                 : natural

        );

        port (

                wren_a          : in std_logic;

                clock0          : in std_logic;

                address_a       : in std_logic_vector(widthad_a-1 downto 0);

                address_b       : in std_logic_vector(widthad_b-1 downto 0);

                rden_b          : in std_logic;

                q_b                     : out std_logic_vector(width-1 downto 0);

                data_a          : in std_logic_vector(width-1 downto 0)

        );

        end component;

        signal s0ext_wr_add_one_hot : std_logic_vector(external_writeable_blocks-1+1 downto 0); --! La se ñal extra es para la escritura de la cola de instrucciones.

        signal s0ext_wr_add                     : std_logic_vector(external_writeable_widthad+widthadmemblock-1 downto 0);

        signal s0ext_rd_add                     : std_logic_vector(external_readable_widthad-1 downto 0);

        signal s0int_rd_add                     : std_logic_vector(widthadmemblock-1 downto 0);

        signal s0ext_wr,s0ext_rd        : std_logic;

        signal s0ext_d                          : std_logic_vector(width-1 downto 0);

        signal s0ext_rd_ack                     : std_logic_vector(external_readable_blocks-1 downto 0);

        signal s0ext_q,sint_d           : vectorblock08;

        signal sint_rd_add                      : vectorblock02;

        signal s1int_q                          : vectorblock12;

begin

        --! Cola interna de producto punto, ubicada entre el pipe line aritméco. 

        q0q1 : scfifo --! Debe ir registrada la salida.

        generic map ("ON",8,"OFF","Cyclone III","RAM_BLOCK_TYPE=M9K",16,"OFF","SCFIFO",64,4,"OFF","OFF","ON")

        port    map (dpfifo_rd,dpfifo_flush,dpfifo_empty,clk,dpfifo_q,dpfifo_wr,dpfifo_d,dpfifo_full);

        --! Cola interna de normalización de vectores, ubicada entre el pipeline aritm&eacute

        qxqyqz : scfifo

        generic map ("ON",23,"OFF","Cyclone III","RAM_BLOCK_TYPE=M9K",32,"OFF","SCFIFO",96,5,"OFF","OFF","ON")

        port    map (normfifo_rd,normfifo_flush,normfifo_empty,clk,normfifo_q,normfifo_wr,normfifo_d,normfifo_full);

        --! Cola de instrucciones 

        qi : scfifo

        generic map ("ON",31,"ON","Cyclone III","RAM_BLOCK_TYPE_M9K",32,"OFF","SCIFIFO",32,5,"ON","OFF","ON")

        port    map (instrfifo_rd,instrfifo_flush,instrfifo_empty,clk,instrfifo_q,instrfifo_wr,instrfifo_d,instrfifo_full);

        --! Conectar los registros de lectura interna del bloque de operandos a los arreglos > abstracci&oacute:n de código, no influye en la sintesis del circuito.

        sint_rd_add (0)<= int_rd_add(widthadmemblock-1 downto 0);

        sint_rd_add (1)<= int_rd_add(2*widthadmemblock-1 downto widthadmemblock);

        --! Instanciación de la cola de resultados.

        results_blocks:

        for i in 7 downto 0 generate

                sint_d(i) <= int_d((i+1)*width-1 downto i*width);

                resultsfifo : scfifo

                generic map     ("ON",511,"ON","Cyclone III","RAM_BLOCK_TYPE_M9K",512,"OFF","SCIFIFO",32,9,"ON","OFF","ON")

                port    map (s0ext_rd_ack(i),resultfifo_flush,resultfifo_empty(i),clk,s0ext_q(i),resultfifo_wr,sint_d(i),open,resultfifo_full(i));

        end generate results_blocks;

        --! Instanciación de la cola de resultados de salida.

        operands_blocks:

        for i in 11 downto 0 generate

                int_q((i+1)*width-1 downto width*i) <= s1int_q(i);

                operandsblock : altsyncram

                generic map ("NONE","CLOCK0","BYPASS","BYPASS","BYPASS","Cyclone III","altsyncram",2**widthadmemblock,2**widthadmemblock,"DUAL_PORT","NONE","CLOCK0","FALSE","M9K","CLOCK0","OLD_DATA",widthadmemblock,widthadmemblock,width,width,1)

                port    map (s0ext_wr_add_one_hot(i),clk,s0ext_wr_add(widthadmemblock-1 downto 0),sint_rd_add((i/3) mod 2),'1',s1int_q(i),s0ext_d);

        end generate operands_blocks;

        --! Escritura en registros de operandos de entrada.

        operands_block_proc: process (clk,ena)

        begin

                if clk'event and clk='1' and ena='1' then

                         --! Registro de entrada

                         s0ext_wr_add <= ext_wr_add;

                         s0ext_wr  <= ext_wr;

                         s0ext_d  <= ext_d;

                end if;

        end process;

        --! Decodificación de señal escritura x bloque de memoria, selecciona la memoria en la que se va a escribir a partir de la dirección de entrada.

        operands_block_comb: process (s0ext_wr_add,s0ext_wr)

        begin

                --! Etapa 0: Decodificacion de las se&ntilde:ales de escritura.Revisar el capitulo de bloques de memoria para chequear como está el pool de direcciones por bloques de vectores.

                --! Las direcciones de bloque 3,7,11,15 corresponden a la cola de instrucciones.

                case s0ext_wr_add(external_writeable_widthad+widthadmemblock-1 downto widthadmemblock) is

                        when x"0" => s0ext_wr_add_one_hot <= '0'&x"00"&"000"&s0ext_wr;

                        when x"1" => s0ext_wr_add_one_hot <= '0'&x"00"&"00"&s0ext_wr&'0';

                        when x"2" => s0ext_wr_add_one_hot <= '0'&x"00"&'0'&s0ext_wr&"00";

                        when x"4" => s0ext_wr_add_one_hot <= '0'&x"00"&s0ext_wr&"000";

                        when x"5" => s0ext_wr_add_one_hot <= '0'&x"0"&"000"&s0ext_wr&x"0";

                        when x"6" => s0ext_wr_add_one_hot <= '0'&x"0"&"00"&s0ext_wr&'0'&x"0";

                        when x"8" => s0ext_wr_add_one_hot <= '0'&x"0"&'0'&s0ext_wr&"00"&x"0";

                        when x"9" => s0ext_wr_add_one_hot <= '0'&x"0"&s0ext_wr&"000"&x"0";

                        when x"A" => s0ext_wr_add_one_hot <= '0'&"000"&s0ext_wr&x"00";

                        when x"C" => s0ext_wr_add_one_hot <= '0'&"00"&s0ext_wr&'0'&x"00";

                        when x"D" => s0ext_wr_add_one_hot <= '0'&'0'&s0ext_wr&"00"&x"00";

                        when x"E" => s0ext_wr_add_one_hot <= '0'&s0ext_wr&"000"&x"00";

                        when others => s0ext_wr_add_one_hot <= '1'&x"000";

                end case;

        end process;

        --! Decodificación para seleccionar que cola de resultados se conectar´ a la salida del RayTrac. 

        results_block_proc: process(clk,ena)

        begin

                if clk'event and clk='1' and ena='1' then

                        --!Registrar entrada

                        s0ext_rd_add    <= ext_rd_add;

                        s0ext_rd                <= ext_rd;

                        --!Etapa 0: Decodificar la cola que se va a mover (rdack! fifo showahead mode) y por ende leer ese dato.

                        case '0'&s0ext_rd_add is

                                when x"0" => ext_q <= s0ext_q(0);

                                when x"1" => ext_q <= s0ext_q(1);

                                when x"2" => ext_q <= s0ext_q(2);

                                when x"3" => ext_q <= s0ext_q(3);

                                when x"4" => ext_q <= s0ext_q(4);

                                when x"5" => ext_q <= s0ext_q(5);

                                when x"6" => ext_q <= s0ext_q(6);

                                when others => ext_q <= s0ext_q(7);

                        end case;

                end if;

        end process;

        --! rdack decoder para las colas de resultados de salida.

        results_block_proc_combinatorial_stage: process(s0ext_rd,s0ext_rd_add)

        begin

                case '0'&s0ext_rd_add is

                        when x"0" => s0ext_rd_ack <= x"0"&"000"&s0ext_rd;

                        when x"1" => s0ext_rd_ack <= x"0"&"00"&s0ext_rd&'0';

                        when x"2" => s0ext_rd_ack <= x"0"&"0"&s0ext_rd&"00";

                        when x"3" => s0ext_rd_ack <= x"0"&s0ext_rd&"000";

                        when x"4" => s0ext_rd_ack <= "000"&s0ext_rd&x"0";

                        when x"5" => s0ext_rd_ack <= "00"&s0ext_rd&'0'&x"0";

                        when x"6" => s0ext_rd_ack <= "0"&s0ext_rd&"00"&x"0";

                        when others => s0ext_rd_ack <= s0ext_rd&"000"&x"0";

                end case;

        end process;

end memblock_arch;