Datasheet

M2Y51H64TU88D0B / M2Y51H64TU88D6B / M2Y1GH64TU8HD0B / M2Y1GH64TU8HD6B
512MB: 64M x 64 / 1GB: 128M x 64
Unbuffered DDR2 SDRAM DIMM Preliminary Edition
REV 0.1 4
08/2008
© NANYA TECHNOLOGY CORP.
NANYA TECHNOLOGY CORP. reserves the right to change Products and Specifications without notice.
Input/Output Functional Description
Symbol
Type
Polarity
Function
CK0, CK1, CK2
(SSTL)
Positive
Edge
The positive line of the differential pair of system clock inputs which drives the input to
the on-DIMM PLL. All the DDR2 SDRAM address and control inputs are sampled on the
rising edge of their associated clocks.
, , 
(SSTL)
Negative
Edge
The negative line of the differential pair of system clock inputs which drives the input to
the on-DIMM PLL.
CKE0, CKE1
(SSTL)
Active
High
Activates the SDRAM CK signal when high and deactivates the CK signal when low. By
deactivating the clocks, CKE low initiates the Power Down mode, or the Self Refresh
mode.
, 
(SSTL)
Active
Low
Enables the associated SDRAM command decoder when low and disables the
command decoder when high. When the command decoder is disabled, new commands
are ignored but previous operations continue.
, , 
(SSTL)
Active
Low
When sampled at the positive rising edge of the clock, , ,  define the
operation to be executed by the SDRAM.
V
REF
Supply
Reference voltage for SSTL-18 inputs
V
DDQ
Supply
Isolated power supply for the DDR SDRAM output buffers to provide improved noise
immunity
ODT0, ODT1
Input
Active
High
On-Die Termination control signals
BA0, BA1
(SSTL)
-
Selects which SDRAM bank is to be active.
A0 – A9
A10/AP
A11 – A13
(SSTL)
-
During a Bank Activate command cycle, A0-A14 defines the row address (RA0-RA13)
when sampled at the rising clock edge.
During a Read or Write command cycle, A0-A9 defines the column address (CA0-CA9)
when sampled at the rising clock edge. In addition to the column address, AP is used to
invoke Autoprecharge operation at the end of the Burst Read or Write cycle. If AP is
high, autoprecharge is selected and BA0/BA1 defines the bank to be precharged. If AP
is low, autoprecharge is disabled.
During a Precharge command cycle, AP is used in conjunction with BA0/BA1 to control
which bank(s) to precharge. If AP is high all 4 banks will be precharged regardless of the
state of BA0/BA1. If AP is low, then BA0/BA1 are used to define which bank to
pre-charge.
DQ0 – DQ63
(SSTL)
Active
High
Data and Check Bit Input/Output pins.
VDD, VSS
Supply
Power and ground for the DDR2 SDRAM input buffers and core logic
DQS0 – DQS8
 – 
(SSTL)
Negative
and
Positive
Edge
Data strobe for input and output data
DM0 – DM8
Input
Active
High
The data write masks, associated with one data byte. In Write mode, DM operates as a
byte mask by allowing input data to be written if it is low but blocks the write operation if
it is high. In Read mode, DM lines have no effect.
SA0 – SA2
-
Address inputs. Connected to either V
DD
or V
SS
on the system board to configure the
Serial Presence Detect EEPROM address.
SDA
-
This bi-directional pin is used to transfer data into or out of the SPD EEPROM. A resistor
must be connected from the SDA bus line to V DD to act as a pull-up.
SCL
-
This signal is used to clock data into and out of the SPD EEPROM. A resistor may be
connected from the SCL bus time to V DD to act as a pull-up.
V
DDSPD
Supply
Serial EEPROM positive power supply.