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-------------------------------------------------------------------------------------------------
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-- Title : ONFI compliant NAND interface
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-- File : onfi_package.vhd
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-- Author : Alexey Lyashko <pradd@opencores.org>
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-- License : LGPL
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-------------------------------------------------------------------------------------------------
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-- Description:
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-- This file contains clock cycle duration definition, delay timing constants as well as
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-- definition of FSM states and types used in the module.
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-------------------------------------------------------------------------------------------------
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-------------------------------------------------------------------------------------------------
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library ieee;
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use ieee.std_logic_1164.all;
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package onfi is
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-- Clock cycle length in ns
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-- IMPORTANT!!! The 'clock_cycle' is configured for 400MHz, change it appropriately!
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constant clock_cycle : real := 2.5;
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-- NAND interface delays.
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-- Delays of 7.5ns may need to be fixed to 7.0.
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constant t_cls : integer := integer(10.0 / clock_cycle);
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constant t_clh : integer := integer(5.0 / clock_cycle);
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constant t_wp : integer := integer(10.0 / clock_cycle);
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constant t_wh : integer := integer(7.5 / clock_cycle);
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constant t_wc : integer := integer(20.0 / clock_cycle);
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constant t_ds : integer := integer(7.5 / clock_cycle);
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constant t_dh : integer := integer(5.0 / clock_cycle);
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constant t_als : integer := integer(10.0 / clock_cycle);
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constant t_alh : integer := integer(5.0 / clock_cycle);
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constant t_rr : integer := integer(20.0 / clock_cycle);
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constant t_rea : integer := integer(16.0 / clock_cycle);
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constant t_rp : integer := integer(10.0 / clock_cycle);
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constant t_reh : integer := integer(7.5 / clock_cycle);
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constant t_wb : integer := integer(100.0 / clock_cycle);
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constant t_rst : integer := integer(5000.0 / clock_cycle);
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constant t_bers : integer := integer(700000.0 / clock_cycle);
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constant t_whr : integer := integer(80.0 / clock_cycle);
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constant t_prog : integer := integer(600000.0 / clock_cycle);
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constant t_adl : integer := integer(70.0 / clock_cycle);
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type latch_t is (LATCH_CMD, LATCH_ADDR);
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type io_t is (IO_READ, IO_WRITE);
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type master_state_t is
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(
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M_IDLE, -- NAND Master is in idle state - awaits commands.
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M_RESET, -- NAND Master is being reset.
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M_WAIT, -- NAND Master waits for current operation to complete.
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M_DELAY, -- Execute timed delay.
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M_NAND_RESET, -- NAND Master executes NAND 'reset' command.
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M_NAND_READ_PARAM_PAGE, -- Read ONFI parameter page.
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M_NAND_READ_ID, -- Read the JEDEC ID of the chip.
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M_NAND_BLOCK_ERASE, -- Erase block specified by address in current_address.
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M_NAND_READ_STATUS, -- Read status byte.
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M_NAND_READ, -- Reads page into the buffer.
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M_NAND_READ_8,
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M_NAND_READ_16,
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M_NAND_PAGE_PROGRAM, -- Program one page.
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-- interface commands
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MI_GET_STATUS, -- Returns the status byte.
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MI_CHIP_ENABLE, -- Sets CE# to 0.
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MI_CHIP_DISABLE, -- Sets CE# to 1.
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MI_WRITE_PROTECT, -- Sets WP# to 0.
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MI_WRITE_ENABLE, -- Sets WP# to 1.
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MI_RESET_INDEX, -- Resets page_idx (used as indes into arrays) to 0.
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-- The following states depend on 'page_idx' pointer. If its value goes beyond the limits
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-- of the array, it is then reset to 0.
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MI_GET_ID_BYTE, -- Gets chip_id(page_idx) byte.
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MI_GET_PARAM_PAGE_BYTE, -- Gets page_param(page_idx) byte.
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MI_GET_DATA_PAGE_BYTE, -- Gets page_data(page_idx) byte.
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MI_SET_DATA_PAGE_BYTE, -- Sets value at page_data(page_idx).
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MI_GET_CURRENT_ADDRESS_BYTE, -- Gets current_address(page_idx) byte.
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MI_SET_CURRENT_ADDRESS_BYTE -- Sets value at current_address(page_idx).
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);
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type master_substate_t is
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(
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MS_BEGIN,
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MS_SUBMIT_COMMAND,
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MS_SUBMIT_COMMAND1,
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MS_SUBMIT_ADDRESS,
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MS_WRITE_DATA0,
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MS_WRITE_DATA1,
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MS_WRITE_DATA2,
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MS_WRITE_DATA3,
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MS_READ_DATA0,
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MS_READ_DATA1,
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MS_READ_DATA2,
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MS_DELAY,
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MS_WAIT,
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MS_END
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);
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type page_t is array (0 to 8628) of std_logic_vector(7 downto 0);
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type param_page_t is array (0 to 255) of std_logic_vector(7 downto 0);
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type nand_id_t is array (0 to 4) of std_logic_vector(7 downto 0);
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type nand_address_t is array (0 to 4) of std_logic_vector(7 downto 0);
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type states_t is array (0 to 255) of master_state_t;
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constant max_page_idx : integer := 8626;
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end onfi;
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