jens
5427d4cae0
- define burst length in sdram_config git-svn-id: http://moon:8086/svn/vhdl/trunk@1223 cc03376c-175c-47c8-b038-4cd826a8556b
69 lines
2.4 KiB
VHDL
69 lines
2.4 KiB
VHDL
-------------------------------------------------------------------------
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-- Project: SDRAM controller
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-- This file: Type definitions
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--
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-- Copyright (C) 2007 J. Ahrensfeld
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--
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-- This program is free software: you can redistribute it and/or modify
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-- it under the terms of the GNU General Public License as published by
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-- the Free Software Foundation, either version 3 of the License, or
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-- (at your option) any later version.
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--
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-- This program is distributed in the hope that it will be useful,
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-- but WITHOUT ANY WARRANTY; without even the implied warranty of
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-- MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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-- GNU General Public License for more details.
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--
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-- You should have received a copy of the GNU General Public License
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-- along with this program. If not, see <http://www.gnu.org/licenses/>.
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--
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-- For questions and ideas, please contact the author at jens@jayfield.org
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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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USE IEEE.NUMERIC_STD.ALL;
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USE IEEE.MATH_REAL.ALL;
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package sdram_const is
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-----------------------------------------------------------------------------------------
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-- Table of Timing Parameters as a function of operation
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-- Derived constants from sdram_config
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subtype user_cmd_t is unsigned(1 downto 0);
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constant UCMD_NOP : user_cmd_t := "00";
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constant UCMD_READ : user_cmd_t := "01";
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constant UCMD_WRITE : user_cmd_t := "10";
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constant UCMD_LMR : user_cmd_t := "11";
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subtype sdr_cmd_t is natural range 0 to 9;
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constant SD_DESELECT : sdr_cmd_t := 0;
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constant SD_NOP : sdr_cmd_t := 1;
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constant SD_LMR : sdr_cmd_t := 2;
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constant SD_ACT : sdr_cmd_t := 3;
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constant SD_READ : sdr_cmd_t := 4;
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constant SD_WRITE : sdr_cmd_t := 5;
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constant SD_PRE : sdr_cmd_t := 6;
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constant SD_BST : sdr_cmd_t := 7;
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constant SD_AR : sdr_cmd_t := 8;
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constant SD_SR : sdr_cmd_t := 9;
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constant LMR_REG_BASE : natural := 0;
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constant LMR_REG_EXTENDED : natural := 1;
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constant LMR_OP_NORMAL : natural := 0;
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constant LMR_OP_RES_DLL : natural := 2;
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constant LMR_BT_SEQ : natural := 0;
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constant LMR_BT_ILVD : natural := 1;
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constant LMR_BL1 : natural := 0;
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constant LMR_BL2 : natural := 1;
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constant LMR_BL4 : natural := 2;
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constant LMR_BL8 : natural := 3;
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constant LMR_CL2 : natural := 2;
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constant LMR_CL3 : natural := 3;
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constant LMR_CL2_5 : natural := 6;
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end sdram_const;
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