MT36VDDT51272G Datasheet, PDF (5/18 Pages) Micron Technology – DDR SDRAM RDIMM

1GB, 2GB, 4GB (x72, ECC, DR) 184-Pin DDR RDIMM
Pin Assignments and Descriptions
Table 7: Pin Descriptions
Symbol
A0–A13
BA0, BA1
CK0, CK0#
CKE0, CKE1
RAS#, CAS#, WE#
RESET#
S0#, S1#
SA0–SA2
SCL
CB0–CB7
DQ0–DQ63
DQS0–DQS17
SDA
VDD/VDDQ
VDDSPD
VREF
VSS
NC
NF
Type
Input
Input
Input
Input
Input
Input
Input
Input
Input
I/O
I/O
I/O
I/O
Supply
Supply
Supply
Supply
–
–
Description
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 device bank. A10
sampled during a PRECHARGE command determines whether the PRECHARGE
applies to one device bank (A10 LOW, device bank selected by BA0 and BA1)
or all device banks (A10 HIGH). The address inputs also provide the op-code
during a MODE REGISTER SET command. BA0 and BA1 define which mode
register (mode register or extended mode register) is loaded during the LOAD
MODE REGISTER command. A0–A12 (1GB, 2GB ) or A0–A13 (4GB).
Bank address: BA0 and BA1 define the device bank to which an ACTIVE,
READ, WRITE, or PRECHARGE command is being applied.
Clock: CK and CK# are differential clock inputs. All control, command, and
address input signals are sampled on the crossing of the positive edge of CK
and the negative edge of CK#. Output data (DQ and DQS) is referenced to the
crossings of CK and CK#.
Clock enable: CKE enables (registered HIGH) and CKE disables (registered
LOW) the internal clock, input buffers, and output drivers.
Command inputs: RAS#, CAS#, and WE# (along with S#) define the command
being entered.
Reset: Asynchronously forces all registered outputs LOW when RESET# is LOW.
This signal can be used during power-up to ensure that CKE is LOW and DQ are
High-Z.
Chip select: S# enables (registered LOW) and disables (registered HIGH) the
command decoder.
Presence-detect address inputs: These pins are used to configure the SPD
EEPROM address range on the I²C bus.
Serial clock for SPD EEPROM: SCL is used to synchronize the presence-detect
data transfer to and from the module.
Check bits.
Data input/output: Data bus.
Data strobe: Output with read data. Edge-aligned with read data. Input with
write data. Center-aligned with write data. Used to capture data.
Serial 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: +2.5V ±0.2V.
SPD EEPROM power supply: +2.3V to +3.6V.
SSTL_2 reference voltage (VDD/2).
Ground.
No connect: These pins are not connected on the module.
No function: These pins are connected within the module, but provide no
functionality.
PDF: 09005aef809d5451/Source: 09005aef807da325
dd36c128_256_512x72.fm - Rev. F 6/08 EN
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