54 lines
1.7 KiB
C
54 lines
1.7 KiB
C
/*
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* sdram_mode.h: Definitions for SDRAM Mode Register and Extended Mode Register
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*
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* Copyright (C) 2005 Digital Design Corporation
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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 2 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, write to the Free Software
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* Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
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*/
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#ifndef __SDRAMMODE_H_DEFINED
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#define __SDRAMMODE_H_DEFINED
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// SDRAM Mode Register definitions, per JESD79D
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// These are transmitted via A0-A13
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// Burst length
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#define SDRAM_BURST_2 (1<<0)
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#define SDRAM_BURST_4 (2<<0)
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#define SDRAM_BURST_8 (3<<0)
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#define SDRAM_BURST_SEQUENTIAL (0<<3)
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#define SDRAM_BURST_INTERLEAVED (1<<3)
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#define SDRAM_CAS_2_0 (2<<4)
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#define SDRAM_CAS_3_0 (3<<4) /* Optional for DDR 200-333 */
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#define SDRAM_CAS_1_5 (5<<4) /* Optional */
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#define SDRAM_CAS_2_5 (6<<4)
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#define SDRAM_CAS_MASK (7<<4)
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#define SDRAM_MODE_NORMAL (0 << 7)
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#define SDRAM_MODE_TEST (1 << 7)
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#define SDRAM_MODE_DLL_RESET (2 << 7)
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// Extended Mode Register
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#define SDRAM_EXTMODE_DLL_ENABLE (0 << 0)
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#define SDRAM_EXTMODE_DLL_DISABLE (1 << 0)
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#define SDRAM_EXTMODE_DRIVE_NORMAL (0 << 1)
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#define SDRAM_EXTMODE_DRIVE_WEAK (1 << 1) /* Optional */
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#endif // __SDRAMMODE_H_DEFINED
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