NT256D64S88A2GM Datasheet, PDF (3/14 Pages) List of Unclassifed Manufacturers – 200pin One Bank Unbuffered DDR SO-DIMM

NT256D64S88A2GM
256MB : 32M x 64
PC2100 / PC1600 Unbuffered DDR SO-DIMM
Input/Output Functional Description
Symbol
CK0 , CK1, CK2
CK0 , CK1 , CK2
CKE0
S0
RAS , CAS , WE
VREF
VDDQ
BA0, BA1
A0 - A9
A10/AP
A11,A12
DQ0 - DQ63,
DQS0 - DQS7
DM0 – DM7
VDD , VSS
SA0 – SA2
SDA
SCL
V DDSPD
Type
(SSTL)
(SSTL)
(SSTL)
(SSTL)
(SSTL)
Supply
Supply
(SSTL)
(SSTL)
(SSTL)
(SSTL)
Input
Supply
Supply
Polarity
Function
The positive line of the differential pair of system clock inputs which drives the input to the
Positive
on-DIMM PLL. All the DDR SDRAM address and control inputs are sampled on the rising
Edge
edge of their associated clocks.
Negative The negative line of the differential pair of system clock inputs which drives the input to the
Edge on-DIMM PLL.
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.
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.
Active When sampled at the positive rising edge of the clock, RAS , CAS , WE define the
Low _{operation to be executed by the SDRAM.}
Reference voltage for SSTL-2 inputs
Isolated power supply for the DDR SDRAM output buffers to provide improved noise
immunity
- Selects which SDRAM bank is to be active.
During a Bank Activate command cycle, A0-A12 defines the row address (RA0-RA12)
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 define 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.
-
Data and Check Bit input/output pins operate in the same manner as on conventional
DRAMs.
Active Data strobes: Output with read data, input with write data. Edge aligned with read data,
High _{centered on write data. Used to capture write data.}
The data write masks, associated with one data byte. In Write mode, DM operates as a
Active byte mask by allowing input data to be written if it is low but blocks the write operation if it
High _{is high. In Read mode, DM lines have no effect. DM8 is associated with check bits}
CB0-CB7, and is not used on x64 modules.
Power and ground for the DDR SDRAM input buffers and core logic
-
Address inputs. Connected to either VDD or VSS on the system board to configure the
Serial Presence Detect EEPROM address.
This bidirectional 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 pullup.
-
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 pullup.
Serial EEPROM positive power supply.
Preliminary 01 / 2002
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