LIBRARY IEEE; USE IEEE.std_logic_1164.ALL; USE IEEE.numeric_std.ALL; LIBRARY work; PACKAGE ddr_ram_model_pkg IS COMPONENT ddr_ram_model IS GENERIC ( VERBOSE : BOOLEAN := TRUE; -- define if you want additional debug output CLOCK_TICK : TIME := (1000000 / 132000) * 1 ps; -- time for one clock tick NBANK : INTEGER := 4; ADDRTOP : INTEGER := 12; A10_LESS : BOOLEAN := TRUE; -- top column address is less than A10 B : INTEGER := 16; -- number of bit (x16) NCOL : INTEGER := 10; -- top column address is CA9 (NCOL- 1) PAGEDEPTH : INTEGER := 1024; NDM : INTEGER := 2; NDQS : INTEGER := 2 ); PORT ( dqi : INOUT STD_LOGIC_VECTOR (B - 1 DOWNTO 0); ba : IN UNSIGNED (NBANK / 2 - 1 DOWNTO 0); ad : IN STD_LOGIC_VECTOR (ADDRTOP DOWNTO 0); rasb : IN STD_LOGIC; casb : IN STD_LOGIC; web : IN STD_LOGIC; clk : IN STD_LOGIC; clkb : IN STD_LOGIC; cke : IN STD_LOGIC; csb : IN STD_LOGIC; dm : IN UNSIGNED (NDM - 1 DOWNTO 0); dqs : INOUT STD_LOGIC_VECTOR (NDQS - 1 DOWNTO 0); qfc : OUT STD_LOGIC ); END COMPONENT; END PACKAGE; PACKAGE BODY ddr_ram_model_pkg IS END PACKAGE BODY ddr_ram_model_pkg; --------------------------------------------------------------------------------------------------------------------------------------- LIBRARY IEEE; USE IEEE.std_logic_1164.ALL; USE IEEE.numeric_std.ALL; LIBRARY work; USE work.ddr_ram_model_pkg.ALL; ENTITY ddr_ram_model IS GENERIC ( VERBOSE : BOOLEAN := TRUE; -- define if you want additional debug output CLOCK_TICK : TIME := (1000000 / 132000) * 1 ps; -- time for one clock tick NBANK : INTEGER := 4; ADDRTOP : INTEGER := 12; A10_LESS : BOOLEAN := TRUE; -- top column address is less than A10 B : INTEGER := 16; -- number of bit (x16) NCOL : INTEGER := 10; -- top column address is CA9 (NCOL - 1) PAGEDEPTH : INTEGER := 1024; NDM : INTEGER := 2; NDQS : INTEGER := 2 ); PORT ( dqi : INOUT STD_LOGIC_VECTOR (B - 1 DOWNTO 0); ba : IN UNSIGNED (NBANK / 2 - 1 DOWNTO 0); ad : IN STD_LOGIC_VECTOR (ADDRTOP DOWNTO 0); rasb : IN STD_LOGIC; casb : IN STD_LOGIC; web : IN STD_LOGIC; clk : IN STD_LOGIC; clkb : IN STD_LOGIC; cke : IN STD_LOGIC; csb : IN STD_LOGIC; dm : IN UNSIGNED (NDM - 1 DOWNTO 0); dqs : INOUT STD_LOGIC_VECTOR (NDQS - 1 DOWNTO 0); qfc : OUT STD_LOGIC ); END ENTITY ddr_ram_model; ARCHITECTURE rtl OF ddr_ram_model IS -- DDR RAM timing constants CONSTANT TRC : TIME := 65 ps; -- row cycle time (min) CONSTANT TRFC : TIME := 115 ps; -- Refresh Row cycle time (min) CONSTANT TRASMIN : TIME := 45 ps; -- Row active minimum time CONSTANT TRASMAX : TIME := 120000 ps; -- Row active maximum time CONSTANT TRCD : TIME := 20 ps; -- Ras to cas delay (min) CONSTANT TRP : TIME := 20 ps; -- Row precharge time (min) CONSTANT TRRD : TIME := 15 ps; -- Row to row delay (min) CONSTANT TCCD : TIME := CLOCK_TICK; -- Col. address to col. address delay: 1 clk CONSTANT TCKMIN : TIME := 7.5 ps; -- Clock minimum cycle time CONSTANT TCKMAX : TIME := 12 ps; -- Clock maximum cycle time CONSTANT TCK15 : TIME := 10 ps; -- Clock minimum cycle time at cas latency=1.5 CONSTANT TCK2 : TIME := 10 ps; -- Clock minimum cycle time at cas latency=2 CONSTANT TCK25 : TIME := 7.5 ps; -- Clock minimum cycle time at cas latency=2.5 CONSTANT TCK3 : TIME := 7.5 ps; -- Clock minimum cycle time at cas latency=3 CONSTANT TCHMIN : TIME := 0.45 ps; -- Clock high pulse width (min. 0.45 tCK, max: 0.55 tCK) CONSTANT TCHMAX : TIME := 0.55 ps; CONSTANT TCLMIN : TIME := 0.45 ps; -- Clock low pulse width (min. 0.45 tCK, max: 0.55 tCK) CONSTANT TCLMAX : TIME := 0.55 ps; CONSTANT TIS : TIME := 0.9 ps; -- input setup time (old Tss) CONSTANT TIH : TIME := 0.9 ps; -- input hold time (old Tsh) CONSTANT TWR : TIME := 15 ps; -- write recovery time CONSTANT TDS : TIME := 0.5 ps; -- Data in & DQM setup time CONSTANT TDH : TIME := 0.5 ps; -- Data in & DQM hold time CONSTANT TDQSH : TIME := 0.6 ps; -- DQS-in high level width (min. 0.4 tCK, max. 0.6 tCK) CONSTANT TDQSL : TIME := 0.6 ps; -- CONSTANT TDSC : TIME := 1 ps; -- DQS-in cycle time tCIC changed following tDSC CONSTANT TPDEX : TIME := 7.5 ps; -- Power down exit time CONSTANT TSREX : TIME := 200 ps; -- Self refresh exit time : 200 clk CONSTANT THZQ : TIME := 0.75 ps; -- Data out active to High-Z (min:-0.75, max: +0.75) CONSTANT TDQSCK : TIME := 0.75 ps; -- DQS out edge to clock edge CONSTANT TAC : TIME := 0.75 ps; -- Output data access time from CK/CKB (min: -0.75, max: +0.75) CONSTANT TQCSW : TIME := 3.5 ps; -- Delay from the clock edge of write command to QFC out on writes (max: 4ns) CONSTANT TQCHW : TIME := 0.5 ps; -- QFC hold time on writes (min 1.25 ns, max: 0.5 tCK) CONSTANT TQCH : TIME := 0.4 ps; -- QFC hold time on reads (min 0.4 tCK, max 0.6 tCK) CONSTANT TQCS : TIME := 0.9 ps; -- QFC setup time on reads (min: 0.9 tCK, max 1.1 tCK) CONSTANT K1 : INTEGER := 1024; CONSTANT M1 : INTEGER := 1048576; CONSTANT BYTE : INTEGER := 8; CONSTANT TBITS : INTEGER := 512 * M1; --SIGNAL BITs : UNSIGNED (B - 1 DOWNTO 0); SIGNAL BIT_C : UNSIGNED (NCOL - 1 DOWNTO 0); CONSTANT NWORD : INTEGER := TBITS / B / NBANK; SIGNAL BIT_T : UNSIGNED (NCOL + ADDRTOP DOWNTO 0); SIGNAL WORD : UNSIGNED (NWORD - 1 DOWNTO 0); CONSTANT HB : INTEGER := B / 2; BEGIN END rtl;