2 * Copyright (C) 2003 Arabella Software Ltd.
3 * Yuli Barcohen <yuli@arabellasw.com>
5 * Serial Presence Detect (SPD) EEPROM format according to the
6 * Intel's PC SDRAM Serial Presence Detect (SPD) Specification,
7 * revision 1.2B, November 1999
9 * This program is free software; you can redistribute it and/or
10 * modify it under the terms of the GNU General Public License as
11 * published by the Free Software Foundation; either version 2 of the
12 * License, or (at your option) any later version.
14 * This program is distributed in the hope that it will be useful, but
15 * WITHOUT ANY WARRANTY; without even the implied warranty of
16 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
17 * General Public License for more details.
19 * You should have received a copy of the GNU General Public License
20 * along with this program; if not, write to the Free Software
21 * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
27 typedef struct spd_eeprom_s {
28 unsigned char info_size; /* # of bytes written into serial memory */
29 unsigned char chip_size; /* Total # of bytes of SPD memory device */
30 unsigned char mem_type; /* Fundamental memory type (FPM, EDO, SDRAM...) */
31 unsigned char nrow_addr; /* # of Row Addresses on this assembly */
32 unsigned char ncol_addr; /* # of Column Addresses on this assembly */
33 unsigned char nrows; /* # of Module Rows on this assembly */
34 unsigned char dataw_lsb; /* Data Width of this assembly */
35 unsigned char dataw_msb; /* ... Data Width continuation */
36 unsigned char voltage; /* Voltage interface standard of this assembly */
37 unsigned char clk_cycle; /* SDRAM Cycle time at CL=X */
38 unsigned char clk_access; /* SDRAM Access from Clock at CL=X */
39 unsigned char config; /* DIMM Configuration type (non-parity, ECC) */
40 unsigned char refresh; /* Refresh Rate/Type */
41 unsigned char primw; /* Primary SDRAM Width */
42 unsigned char ecw; /* Error Checking SDRAM width */
43 unsigned char min_delay; /* Min Clock Delay for Back to Back Random Address */
44 unsigned char burstl; /* Burst Lengths Supported */
45 unsigned char nbanks; /* # of Banks on Each SDRAM Device */
46 unsigned char cas_lat; /* CAS# Latencies Supported */
47 unsigned char cs_lat; /* CS# Latency */
48 unsigned char write_lat; /* Write Latency (also called Write Recovery time) */
49 unsigned char mod_attr; /* SDRAM Module Attributes */
50 unsigned char dev_attr; /* SDRAM Device Attributes */
51 unsigned char clk_cycle2; /* Min SDRAM Cycle time at CL=X-1 */
52 unsigned char clk_access2; /* SDRAM Access from Clock at CL=X-1 */
53 unsigned char clk_cycle3; /* Min SDRAM Cycle time at CL=X-2 */
54 unsigned char clk_access3; /* Max SDRAM Access from Clock at CL=X-2 */
55 unsigned char trp; /* Min Row Precharge Time (tRP) */
56 unsigned char trrd; /* Min Row Active to Row Active (tRRD) */
57 unsigned char trcd; /* Min RAS to CAS Delay (tRCD) */
58 unsigned char tras; /* Minimum RAS Pulse Width (tRAS) */
59 unsigned char row_dens; /* Density of each row on module */
60 unsigned char ca_setup; /* Command and Address signal input setup time */
61 unsigned char ca_hold; /* Command and Address signal input hold time */
62 unsigned char data_setup; /* Data signal input setup time */
63 unsigned char data_hold; /* Data signal input hold time */
64 unsigned char sset[26]; /* Superset Information (may be used in future) */
65 unsigned char spd_rev; /* SPD Data Revision Code */
66 unsigned char cksum; /* Checksum for bytes 0-62 */
67 unsigned char mid[8]; /* Manufacturer's JEDEC ID code per JEP-108E */
68 unsigned char mloc; /* Manufacturing Location */
69 unsigned char mpart[18]; /* Manufacturer's Part Number */
70 unsigned char rev[2]; /* Revision Code */
71 unsigned char mdate[2]; /* Manufacturing Date */
72 unsigned char sernum[4]; /* Assembly Serial Number */
73 unsigned char mspec[27]; /* Manufacturer Specific Data */
74 unsigned char freq; /* Intel specification frequency */
75 unsigned char intel_cas; /* Intel Specification CAS# Latency support */