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Information is intended only for use on Micron manufactured modules. All information is provided "AS IS" and without warranties of any kind.
| Byte Number | Byte Description | Byte Value |
|---|---|---|
| 0 | DDR4-SPD BYTES USE/TOTAL BYTES AVAILABLE/CRC COVERAGE | 23 |
| 1 | DDR4-SPD REVISION | 11 |
| 2 | DDR4-DRAM DEVICE TYPE | 0C |
| 3 | DDR4-MODULE TYPE (FORM FACTOR) | 01 |
| 4 | DDR4-SDRAM DEVICE DENSITY BANKS | 85 |
| 5 | DDR4-SDRAM DEVICE ADDRESSING | 21 |
| 6 | DDR4-SDRAM DEVICE TYPE (ARCHITECURE) | 00 |
| 7 | DDR4-SDRAM DEVICE OPTIONAL FEATURES | 08 |
| 8 | DDR4-SDRAM DEVICE THERMAL REFRESH OPTIONS | 00 |
| 9 | DDR4-OTHER SDRAM OPTIONAL FEATURES | 60 |
| 10 | DDR4-SECONDARY SDRAM PACKAGE TYPE | 00 |
| 11 | DDR4-NOMINAL MODULE VOLTAGE (VDD) | 03 |
| 12 | DDR4-MODULE ORG. (PACKAGE RANKS DEVICE WIDTH) | 01 |
| 13 | DDR4-MODULE MEMORY BUS WIDTH | 0B |
| 14 | DDR4-MODULE THERMAL SENSOR SUPPORT | 80 |
| 15 | DDR4-EXTENDED MODULE TYPE | 00 |
| 16 | DDR4-BYTE 16 RESERVED | 00 |
| 17 | DDR4-TIMEBASES (MTB FTB) | 00 |
| 18 | DDR4-SDRAM DEVICE TCKMIN | 06 |
| 19 | DDR4- SDRM DEVICE TCKMAX | 0D |
| 20 | DDR4-CL7 THROUGH CL14 SUPPORT | F8 |
| 21 | DDR4-CL15 THROUGH CL22 SUPPORT | FF |
| 22 | DDR4-CL23 THROUGH CL30 SUPPORT | 01 |
| 23 | DDR4-CL31 THROUGH CL36 SUPPORT-CL RNG | 00 |
| 24 | DDR4-MIN CAS LATENCY (TAAMIN) | 6E |
| 25 | DDR4-MIN RAS TO CAS DELAY (TRCDMIN) | 6E |
| 26 | DDR4-MIN ROW PRECHARGE DELAY (TRPMIN) | 6E |
| 27 | DDR4-UPPER NIBBLE TRASMIN, TRCMIN | 11 |
| 28 | DDR4-MIN ACTIVE TO PRECHARGE DELAY (TRASMIN) LSB | 00 |
| 29 | DDR4-MIN ACTIVE TO ACTIVE/REFRESH DELAY (TRCMIN) LSB | 6E |
| 30 | DDR4-MIN REFRESH RECOVERY DELAY (TRFC1MIN) LSB | F0 |
| 31 | DDR4-MIN REFRESH RECOVERY DELAY (TRFC1MIN) MSB | 0A |
| 32 | DDR4-MIN REFRESH RECOVERY TIME DELAY (TRFC2MIN) LSB | 20 |
| 33 | DDR4-MIN REFRESH RECOVERY DELAY (TRFC2MIN) MSB | 08 |
| 34 | DDR4-MIN REFRESH RECOVERY DELAY (TRFC4MIN) LSB | 00 |
| 35 | DDR4-MIN REFRESH RECOVERY DELAY (TRFC4MIN) MSB | 05 |
| 36 | DDR4-MIN FOUR ACTIVE WINDOW DELAY (TFAWMIN) UPPER NIB | 00 |
| 37 | DDR4-MIN FOUR ACTIVE WINDOW DELAY (TFAWMIN) LSB | A8 |
| 38 | DDR4-MIN ACTIVE TO ACTIVE DELAY (TRRD_SMIN) DIFRNT BANK GRP | 18 |
| 39 | DDR4-MIN ACTIVE TO ACTIVE DELAY (TRRD_LMIN) SAME BANK GRP | 28 |
| 40 | DDR4-MIN CAS TO CAS DELAY, SAME BG (TCCDLMIN) | 28 |
| 41 | DDR4-TWRMIN MSB | 00 |
| 42 | DDR4-TWRMIN LSB | 78 |
| 43 | DDR4-TWTR_LMIN/TWTR_SMIN - MSB (UPPER NIBLS) | 00 |
| 44 | DDR4-TWTR_SMIN - LSB | 14 |
| 45 | DDR4-TWTR_LMIN - LSB | 3C |
| 46-59 | DDR4- RESERVED BYTES 46 - 59 | 0000000000000000000000000000 |
| 60 | DDR4-BIT MAP, DQ0 - 3 | 24 |
| 61 | DDR4-BIT MAP, DQ4 -7 | 03 |
| 62 | DDR4-BIT MAP, DQ8 - 11 | 15 |
| 63 | DDR4-BIT MAP, DQ12 - 15 | 2C |
| 64 | DDR4-BIT MAP, DQ16 - 19 | 24 |
| 65 | DDR4-BIT MAP, DQ20 - 23 | 03 |
| 66 | DDR4-BIT MAP, DQ24 - 27 | 15 |
| 67 | DDR4-BIT MAP, DQ28 - 31 | 2C |
| 68 | DDR4-BIT MAP, CB0 - 3 | 24 |
| 69 | DDR4-BIT MAP, CB4 - 7 | 03 |
| 70 | DDR4-BIT MAP, DQ32 - 35 | 24 |
| 71 | DDR4-BIT MAP, DQ36 - 39 | 03 |
| 72 | DDR4-BIT MAP, DQ40 - 43 | 15 |
| 73 | DDR4-BIT MAP, DQ44 - 47 | 2C |
| 74 | DDR4-BIT MAP, DQ48 - 51 | 24 |
| 75 | DDR4-BIT MAP, DQ52 - 55 | 03 |
| 76 | DDR4-BIT MAP, DQ56 - 59 | 15 |
| 77 | DDR4-BIT MAP, DQ60 - 63 | 2C |
| 78-116 | DDR4-RESERVE BYTES 78 - 116 | 000000000000000000000000000000000000000000000000000000000000000000000000000000 |
| 117 | DDR4-FTB OFFSET - TCCDLMIN | 00 |
| 118 | DDR4-FTB OFFSET - TRRD_LMIN | 9C |
| 119 | DDR4-FTB OFFSET - TRRD_SMIN | 00 |
| 120 | DDR4-FTB OFFSET - TRCMIN | 00 |
| 121 | DDR4-FTB OFFSET - TRPMIN | 00 |
| 122 | DDR4-FTB OFFSET - TRCDMIN | 00 |
| 123 | DDR4-FTB OFFSET - TAAMIN | 00 |
| 124 | DDR4-FTB OFFSET - TCKMAX | E7 |
| 125 | DDR4-FTB OFFSET - TCKMIN | 00 |
| 126-127 | DDR4-CRC FOR BYTES 0 - 125, BASE CONFIG | E0ED |
| 128 | DDR4-RAW CARD EXT. AND MODULE NOM. HEIGHT | 11 |
| 129 | DDR4-MODULE MAX THICKNESS | 11 |
| 130 | DDR4-RAW CARD ID | 23 |
| 131 | DDR4-UDIMM ADDRESS MAPPING - RDIMM MODULE ATTRIBUTES | 15 |
| 132 | DDR4-RDIMM HEAT SPREADER SOLUTION | 00 |
| 133 | DDR4-RDIMM REGISER MFR. ID (LSB) | 86 |
| 134 | DDR4-REGISTER MFR. ID (MSB) | 32 |
| 135 | DDR4-REGISTER REVISION NUMBER | A0 |
| 136 | DDR4-REGISTER ADDRESS MAPPING | 00 |
| 137 | DDR4-REG OUTPUT DRIVE FOR CONTROL | 00 |
| 138 | DDR4-REG OUTPUT DRIVE FOR CLOCK | 00 |
| 139-253 | DDR4-RESERVE BYTES 139 - 253 | 00000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000 |
| 254-255 | DDR4-CRC FOR MODULE SPECIFIC BYTES 128-253 | 56BB |
| 256-319 | DDR4-BYTES 256 - 319 RESERVED | 00000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000 |
| 320 | DDR4-MODULE MFR. ID CODE (LSB) | 80 |
| 321 | DDR4-MODULE MFR. ID COD (MSB) | 2C |
| 322 | DDR4-MODULE MFR. LOCATION | 00 |
| 323-324 | DDR4-MODULE MFR. DATE | 0000 |
| 325-328 | DDR4-MODULE SERIAL NUMBER | 00000000 |
| 329-348 | DDR4-MODULE PART NUMBER | 9ASF1G72PZ-2G6D1 |
| 349 | DDR4-MODULE PCB REV | 31 |
| 350 | DDR4-DRAM MFR. ID CODE (LSB) | 80 |
| 351 | DDR4-DRAM MFR. ID CODE (MSB) | 2C |
| 352 | DDR4-DEVICE DIE REV (PART MARKING) | 44 |
| 353-383 | DDR4-BYTES 353 - 383 RESERVED | 00000000000000000000000000000000000000000000000000000000000000 |
| 384-511 | DDR4-BYTES 384-511 END USER RESERVED | 000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000 |