mt18lsdt3272dy-133 Micron Semiconductor Products, mt18lsdt3272dy-133 Datasheet - Page 4

• Manufacturer Part Number: mt18lsdt3272dy-133
• Description: 256mb, 512mb, 1gb X72, Ecc, Dr 168-pin Sdram Rdimm
• Manufacturer: Micron Semiconductor Products

Table 6:
PDF: 09005aef809b1694/Source: 09005aef809b166a
SD18C32_64_128x72D.fm - Rev. G 12/07 EN
RAS#, CAS#, WE#
DQMB0–DQMB7
CKE0, CKE1
DQ0–DQ63
BA0, BA1
CK0–CK3
SA0–SA2
CB0–CB7
Symbol
S0#–S3#
A0–A12
REGE
SDA
V
SCL
V
NC
NF
DD
SS
Pin Descriptions
Output
Output
Output
Supply
Supply
Input/
Input/
Input/
Input
Input
Input
Input
Input
Input
Input
Input
Input
Input
Type
–
–
Description
Address inputs: Sampled during the ACTIVE and READ/WRITE commands, with A10
defining auto precharge, to select one location out of the memory array in the
respective device bank. A10 is sampled during a PRECHARGE command to determine
whether both device banks are precharged (A10 HIGH). The address inputs also
provide the op-code during a LOAD MODE REGISTER command. A0–A11 (256MB) and
A0–A12 (512MB, 1GB).
Bank address: BA0 and BA1 define the device bank to which an ACTIVE, READ,
WRITE, or PRECHARGE command is being applied.
Clock: CK0 is distributed through an on-board PLL to all devices. CK1–CK3 are
terminated.
Clock enable: CKE enables (register HIGH) and disables (register LOW) the CK signal.
Deactivating the clock provides power-down and SELF REFRESH operation (all device
banks idle) or CLOCK SUSPEND operation (burst access in progress). CKE is synchronous
except after the device enters power-down and self refresh modes, where CKE
becomes asynchronous until after exiting the same mode. The input buffers, including
CK, are disabled during power-down and self refresh modes, providing low standby
power.
Input/output mask: DQMB is an input mask signal for write accesses and an output
enable signal for read accesses. Input data is masked when DQMB is sampled HIGH
during a WRITE cycle. The output buffers are placed in a High-Z state (two clock
latency) when DQMB is sampled HIGH during a READ cycle.
Command inputs: RAS#, CAS#, and WE# (along with S#) define the command being
entered.
Register enable.
Chip select: S# enables (registered LOW) and disables (registered HIGH) the command
decoder. All commands are masked when S# is registered HIGH. S# is considered part
of the command code.
Presence-detect address inputs: These pins are used to configure the presence-
detect device.
Serial clock for presence-detect: SCL is used to synchronize the presence-detect
data transfer to and from the module.
Check bits.
Data input/output: Data bus.
Serial presence-detect data: SDA is a bidirectional pin used to transfer addresses
and data into and data out of the EEPROM portion of the module.
Power supply: +3.3V ±0.3V.
Ground.
Not connected: These pins are not connected on the module.
No function: Connected within the module but provides no functionality.
256MB, 512MB, 1GB (x72, ECC, DR) 168-Pin SDRAM RDIMM
4
Micron Technology, Inc., reserves the right to change products or specifications without notice.
Pin Assignments and Descriptions
©2001 Micron Technology, Inc. All rights reserved