mt18jbf25672pd Micron Semiconductor Products, mt18jbf25672pd Datasheet - Page 8

• Manufacturer Part Number: mt18jbf25672pd
• Description: 2gb X72, Ecc, Dr 240-pin Ddr3 Sdram Vlp Rdimm
• Manufacturer: Micron Semiconductor Products

Temperature Sensor with Serial Presence-Detect EEPROM
Thermal Sensor Operations
Serial Presence-Detect EEPROM Operation
PDF: 09005aef83244dba/Source:09005aef83244e3a
JBF18C256x72PDY.fm - Rev. B 6/08 EN
The temperature from the integrated thermal sensor is monitored and converted into a
digital word via the I
to create a custom temperature-sensing solution based on system requirements.
Programming and configuration details comply with JEDEC Standard No. 21-C, page
4.7-1 “Mobile Platform Memory Module Thermal Sensor Component Specification.”
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”
(pending approval). These bytes identify module-specific timing parameters, configura-
tion 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
the DIMM’s SCL (clock) and SDA (data) signals, together with SA[2:0], which provide
eight unique DIMM/EEPROM addresses. Write protect (WP) is connected to V
nently disabling hardware write protect.
2GB (x72, ECC, DR) 240-Pin DDR3 SDRAM VLP RDIMM
2
C bus. System designers can use the user-programmable registers
8
Micron Technology, Inc., reserves the right to change products or specifications without notice.
General Description
©2008 Micron Technology, Inc. All rights reserved
2
C bus using
SS
, perma-