mt18jsf25672ay-1g1 Micron Semiconductor Products, mt18jsf25672ay-1g1 Datasheet - Page 8

• Manufacturer Part Number: mt18jsf25672ay-1g1
• Description: 2gb, 4gb X72, Ecc, Dr 240-pin Ddr3 Sdram Udimm
• Manufacturer: Micron Semiconductor Products

Serial Presence-Detect EEPROM Operation
PDF: 09005aef83014429/Source: 09005aef83014466
JSF18C256_512x72A.fm - Rev. C 5/08 EN
DDR3 SDRAM modules incorporate serial presence-detect. The SPD data is stored in a
256-byte EEPROM. The first 128 bytes are programmed by Micron to comply with JEDEC
Standard JC-45 “Appendix X: Serial Presence-Detect (SPD) for DDR3 SDRAM Modules.”
These bytes identify module-specific timing parameters, configuration information, and
physical attributes. User-specific information can be written into the remaining
128 bytes of storage. System READ/WRITE operations between the master (system logic)
and the slave EEPROM device occur via a standard I
and SDA (data) signals, together with SA[2:0], which provide eight unique DIMM/
EEPROM addresses. Write protect (WP) is connected to V
hardware write protect.
2GB, 4GB (x72, ECC, DR) 240-Pin DDR3 SDRAM UDIMM
8
Micron Technology, Inc., reserves the right to change products or specifications without notice.
2
C bus using the DIMM’s SCL (clock)
SS
, permanently disabling
General Description
©2008 Micron Technology, Inc. All rights reserved