MT8HTF12864AY-1GA Micron Semiconductor Products, MT8HTF12864AY-1GA Datasheet - Page 4

• Manufacturer Part Number: MT8HTF12864AY-1GA
• Description: 256mb, 512mb, 1gb X64, Sr 240-pin Ddr2 Sdram Udimm
• Manufacturer: Micron Semiconductor Products

Table 7:
PDF: 09005aef80e2ff8d/Source: 09005aef80e2ff59
HTF8C32_64_128x64A.fm - Rev. F 10/07 EN
RAS#, CAS#, WE#
DQS0#–DQS7#
DQS0–DQS7,
DQ0–DQ63
CK0, CK0#,
CK1, CK1#,
DM0–DM7
CK2, CK2#
V
BA0–BA2
SA0–SA2
Symbol
A0–A13
DD
V
ODT0
CKE0
SDA
DDSPD
V
S0#
SCL
V
NC
/V
REF
SS
DD
Q
Pin Descriptions
(SSTL_18)
(SSTL_18)
(SSTL_18)
(SSTL_18)
(SSTL_18)
(SSTL_18)
(SSTL_18)
(SSTL_18)
(SSTL_18)
(SSTL_18)
(SSTL_18)
(SSTL_18)
Supply
Supply
Supply
Supply
Input
Input
Input
Input
Input
Input
Input
Input
Input
Type
I/O
I/O
I/O
I/O
–
Address inputs: Provide the row address for ACTIVE commands, and the column address
and auto precharge bit (A10) for READ/WRITE commands, to select one location out of
the memory array in the respective bank. A10 sampled during a PRECHARGE command
determines whether the PRECHARGE applies to one device bank (A10 LOW, device bank
selected by BA0–BA2) or all device banks (A10 HIGH). The address inputs also provide the
op-code during a LOAD MODE command. A0–A12 (256MB) and A0–A13 (512MB, 1GB).
Bank address inputs: BA0–BA2 define to which device bank an ACTIVE, READ, WRITE,
or PRECHARGE command is being applied. BA0–BA2 define which mode register,
including MR, EMR, EMR(2), and EMR(3), is loaded during the LOAD MODE command.
BA0, BA1 (256MB, 512MB) and BA0–BA2 (1GB).
Clock: CK and CK# are differential clock inputs. All address and control input signals are
sampled on the crossing of the positive edge of CK and the negative edge of CK#. Output
data (DQs and DQS/DQS#) is referenced to the crossings of CK and CK#.
Clock enable: CKE (registered HIGH) activates and CKE (registered LOW) deactivates
clocking circuitry on the DDR2 SDRAM.
On-die termination: ODT (registered HIGH) enables termination resistance internal to
the DDR2 SDRAM. When enabled, ODT is only applied to the following pins: DQ, DQS,
DQS#, and CB. The ODT input will be ignored if disabled via the LOAD MODE command.
Command inputs: RAS#, CAS#, and WE# (along with S#) define the command being
entered.
Chip select: S# enables (registered LOW) and disables (registered HIGH) the command
decoder.
Presence-detect address inputs: These pins are used to configure the presence-detect
devices.
Serial clock for presence-detect: SCL is used to synchronize the presence-detect data
transfer to and from the module.
Data input mask: DM is an input mask signal for write data. Input data is masked when
DM is sampled HIGH, along with that input data, during a write access. DM is sampled on
both edges of DQS. Although DM pins are input-only, the DM loading is designed to
match that of DQ and DQS pins.
Data input/output: Bidirectional data bus.
Data strobe: Output with read data, input with write data for source synchronous
operation. Edge-aligned with read data, center-aligned with write data. DQS# is only
used when differential data strobe mode is enabled via the LOAD MODE command.
Serial presence-detect data: SDA is a bidirectional pin used to transfer addresses and
data into and out of the presence-detect portion of the module.
Power supply: 1.8V ±0.1V.
Serial EEPROM positive power supply: +1.7V to +3.6V.
SSTL_18 reference voltage. (V
Ground.
No connect: These pins are not connected on the module.
256MB, 512MB, 1GB (x64, SR) 240-Pin DDR2 SDRAM UDIMM
4
DD
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Micron Technology, Inc., reserves the right to change products or specifications without notice.
Description
Pin Assignments and Descriptions
©2003 Micron Technology, Inc. All rights reserved.