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/*
* Copyright (C) 2003 Arabella Software Ltd.
* Yuli Barcohen <yuli@arabellasw.com>
*
* Serial Presence Detect (SPD) EEPROM format according to the
* Intel's PC SDRAM Serial Presence Detect (SPD) Specification,
* revision 1.2B, November 1999
*
* SPDX-License-Identifier: GPL-2.0+
*/
#ifndef _SPD_H_
#define _SPD_H_
typedef struct spd_eeprom_s {
unsigned char info_size; /* 0 # bytes written into serial memory */
unsigned char chip_size; /* 1 Total # bytes of SPD memory device */
unsigned char mem_type; /* 2 Fundamental memory type */
unsigned char nrow_addr; /* 3 # of Row Addresses on this assembly */
unsigned char ncol_addr; /* 4 # of Column Addrs on this assembly */
unsigned char nrows; /* 5 # of Module Rows on this assembly */
unsigned char dataw_lsb; /* 6 Data Width of this assembly */
unsigned char dataw_msb; /* 7 ... Data Width continuation */
unsigned char voltage; /* 8 Voltage intf std of this assembly */
unsigned char clk_cycle; /* 9 SDRAM Cycle time at CL=X */
unsigned char clk_access; /* 10 SDRAM Access from Clock at CL=X */
unsigned char config; /* 11 DIMM Configuration type */
unsigned char refresh; /* 12 Refresh Rate/Type */
unsigned char primw; /* 13 Primary SDRAM Width */
unsigned char ecw; /* 14 Error Checking SDRAM width */
unsigned char min_delay; /* 15 for Back to Back Random Address */
unsigned char burstl; /* 16 Burst Lengths Supported */
unsigned char nbanks; /* 17 # of Banks on Each SDRAM Device */
unsigned char cas_lat; /* 18 CAS# Latencies Supported */
unsigned char cs_lat; /* 19 CS# Latency */
unsigned char write_lat; /* 20 Write Latency (aka Write Recovery) */
unsigned char mod_attr; /* 21 SDRAM Module Attributes */
unsigned char dev_attr; /* 22 SDRAM Device Attributes */
unsigned char clk_cycle2; /* 23 Min SDRAM Cycle time at CL=X-1 */
unsigned char clk_access2; /* 24 SDRAM Access from Clock at CL=X-1 */
unsigned char clk_cycle3; /* 25 Min SDRAM Cycle time at CL=X-2 */
unsigned char clk_access3; /* 26 Max Access from Clock at CL=X-2 */
unsigned char trp; /* 27 Min Row Precharge Time (tRP)*/
unsigned char trrd; /* 28 Min Row Active to Row Active (tRRD) */
unsigned char trcd; /* 29 Min RAS to CAS Delay (tRCD) */
unsigned char tras; /* 30 Minimum RAS Pulse Width (tRAS) */
unsigned char row_dens; /* 31 Density of each row on module */
unsigned char ca_setup; /* 32 Cmd + Addr signal input setup time */
unsigned char ca_hold; /* 33 Cmd and Addr signal input hold time */
unsigned char data_setup; /* 34 Data signal input setup time */
unsigned char data_hold; /* 35 Data signal input hold time */
unsigned char twr; /* 36 Write Recovery time tWR */
unsigned char twtr; /* 37 Int write to read delay tWTR */
unsigned char trtp; /* 38 Int read to precharge delay tRTP */
unsigned char mem_probe; /* 39 Mem analysis probe characteristics */
unsigned char trctrfc_ext; /* 40 Extensions to trc and trfc */
unsigned char trc; /* 41 Min Active to Auto refresh time tRC */
unsigned char trfc; /* 42 Min Auto to Active period tRFC */
unsigned char tckmax; /* 43 Max device cycle time tCKmax */
unsigned char tdqsq; /* 44 Max DQS to DQ skew */
unsigned char tqhs; /* 45 Max Read DataHold skew tQHS */
unsigned char pll_relock; /* 46 PLL Relock time */
unsigned char res[15]; /* 47-xx IDD in SPD and Reserved space */
unsigned char spd_rev; /* 62 SPD Data Revision Code */
unsigned char cksum; /* 63 Checksum for bytes 0-62 */
unsigned char mid[8]; /* 64 Mfr's JEDEC ID code per JEP-108E */
unsigned char mloc; /* 72 Manufacturing Location */
unsigned char mpart[18]; /* 73 Manufacturer's Part Number */
unsigned char rev[2]; /* 91 Revision Code */
unsigned char mdate[2]; /* 93 Manufacturing Date */
unsigned char sernum[4]; /* 95 Assembly Serial Number */
unsigned char mspec[27]; /* 99 Manufacturer Specific Data */
/*
* Open for Customer Use starting with byte 128.
*/
unsigned char freq; /* 128 Intel spec: frequency */
unsigned char intel_cas; /* 129 Intel spec: CAS# Latency support */
} spd_eeprom_t;
/*
* Byte 2 Fundamental Memory Types.
*/
#define SPD_MEMTYPE_FPM (0x01)
#define SPD_MEMTYPE_EDO (0x02)
#define SPD_MEMTYPE_PIPE_NIBBLE (0x03)
#define SPD_MEMTYPE_SDRAM (0x04)
#define SPD_MEMTYPE_ROM (0x05)
#define SPD_MEMTYPE_SGRAM (0x06)
#define SPD_MEMTYPE_DDR (0x07)
#define SPD_MEMTYPE_DDR2 (0x08)
#endif /* _SPD_H_ */
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