diff options
| author | Steven J. Magnani <steve@digidescorp.com> | 2005-09-13 14:54:25 +0000 |
|---|---|---|
| committer | Steven J. Magnani <steve@digidescorp.com> | 2005-09-13 14:54:25 +0000 |
| commit | 61764f45dca2c5d5b3faaec1c912f3d50e8bd8e9 (patch) | |
| tree | d79f1e0cfd4f3c4ae95b5df4b529c15ddc4bad99 /src/include/sdram_mode.h | |
| parent | e91619ac0595f1fe8adf61df75e79ecf79800e86 (diff) | |
| download | coreboot-61764f45dca2c5d5b3faaec1c912f3d50e8bd8e9.tar.xz | |
Initial revision.
git-svn-id: svn://svn.coreboot.org/coreboot/trunk@2027 2b7e53f0-3cfb-0310-b3e9-8179ed1497e1
Diffstat (limited to 'src/include/sdram_mode.h')
| -rw-r--r-- | src/include/sdram_mode.h | 62 |
1 files changed, 62 insertions, 0 deletions
diff --git a/src/include/sdram_mode.h b/src/include/sdram_mode.h new file mode 100644 index 0000000000..f1b142e2ae --- /dev/null +++ b/src/include/sdram_mode.h @@ -0,0 +1,62 @@ +/*
+ * $Header: /home/cvs/BIR/ca-cpu/freebios/src/include/sdram_mode.h,v 1.1 2005/07/11 16:03:54 smagnani Exp $
+ *
+ * sdram_mode.h: Definitions for SDRAM Mode Register and Extended Mode Register
+ *
+ *
+ * Copyright (C) 2005 Digital Design Corporation
+ *
+ * This program 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 2 of the License, or
+ * (at your option) any later version.
+ *
+ * This program 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 this program; if not, write to the Free Software
+ * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
+ *
+ * $Log: sdram_mode.h,v $
+ * Revision 1.1 2005/07/11 16:03:54 smagnani
+ * Initial revision.
+ *
+ *
+ */
+
+#ifndef __SDRAMMODE_H_DEFINED
+#define __SDRAMMODE_H_DEFINED
+
+// SDRAM Mode Register definitions, per JESD79D
+// These are transmitted via A0-A13
+
+// Burst length
+#define SDRAM_BURST_2 (1<<0)
+#define SDRAM_BURST_4 (2<<0)
+#define SDRAM_BURST_8 (3<<0)
+
+#define SDRAM_BURST_SEQUENTIAL (0<<3)
+#define SDRAM_BURST_INTERLEAVED (1<<3)
+
+#define SDRAM_CAS_2_0 (2<<4)
+#define SDRAM_CAS_3_0 (3<<4) /* Optional for DDR 200-333 */
+#define SDRAM_CAS_1_5 (5<<4) /* Optional */
+#define SDRAM_CAS_2_5 (6<<4)
+#define SDRAM_CAS_MASK (7<<4)
+
+#define SDRAM_MODE_NORMAL (0 << 7)
+#define SDRAM_MODE_TEST (1 << 7)
+#define SDRAM_MODE_DLL_RESET (2 << 7)
+
+// Extended Mode Register
+
+#define SDRAM_EXTMODE_DLL_ENABLE (0 << 0)
+#define SDRAM_EXTMODE_DLL_DISABLE (1 << 0)
+
+#define SDRAM_EXTMODE_DRIVE_NORMAL (0 << 1)
+#define SDRAM_EXTMODE_DRIVE_WEAK (1 << 1) /* Optional */
+
+#endif // __SDRAMMODE_H_DEFINED
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