M470T6554BG3-CD5_CC データシートの表示（PDF） - Samsung
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M470T6554BG3-CD5_CC Datasheet PDF : 19 Pages
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256MB, 512MB, 1GB Unbuffered SODIMMs
DDR2 SDRAM
Input/Output Functional Description
Symbol
CK0-CK1
CK0-CK1
CKE0-CKE1
Type
Input
Input
S0-S1
Input
RAS, CAS, WE Input
BA0~BA1
Input
ODT0~ODT1 Input
A0~A9,
A10/AP,
A11~A13
Input
DQ0~DQ63
DM0~DM7
In/Out
Input
DQS0~DQS7
DQS0~DQS7
In/Out
VDD,VDD
SPD,VSS
SDA
SCL
SA0~SA1
TEST
Supply
In/Out
Input
Input
In/Out
Function
The system clock inputs. All address and command lines are sampled on the cross point of the rising edge of CK and falling
edge of CK . A Delay Locked Loop (DLL) circuit is driven from the clock input and output timing for read operations is syn-
chronized to the input clock.
Activates the DDR2 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 Refesh mode.
Enables the associated DDR2 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. Rank 0 is selected by S0,
Rank 1 is selected by S1. Ranks are also called “Physical banks”.
When sampled at the cross point of the rising edge of CK and falling edge of CK, CAS, RAS, and WE define the operation
to be executed by the SDRAM.
Selects which DDR2 SDRAM internal bank is activated.
Asserts on-die termination for DQ, DM, DQS, and DQS signals if enabled via the DDR2 SDRAM Extended Mode Register
Set (EMRS).
During a Bank Activate command cycle, defines the row address when sampled at the cross point of the rising edge of CK
and falling edge of CK. During a Read or Write command cycle, defines the column address when sampled at the cross
point of the rising edge of CK and falling edge of CK. 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-BAn 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-BAn to control which bank(s) to precharge. If AP is high, all banks will be pecharged regardiess of the state of
BA0-BAn inputs. If AP is low, then BA0-BAn are used to define which bank to precharge.
Data Input/Output pins.
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.
The data strobes, associated with one data byte, sourced with data transfers. In Write mode,
the data strobe is sourced by the controller and is centered in the data window. In Read mode,
the data strobe is sourced by the DDR2 SDRAMs and is sent at the leading edge of the data
window. DQS signals are complements, and timing is relative to the crosspoint of respective
DQS and DQS If the module is to be operated in single ended strobe mode, all DQS signals
must be tied on the system board to VSS and DDR2 SDRAM mode registers programmed appropriately.
Power supplies for core, I/O, Serial Presence Detect, and ground for the module.
This is a bidirectional pin used to transfer data into or out of the SPD EEPROM. A resistor must be connected to VDD to act
as a pull up.
This signal is used to clock data into and out of the SPD EEPROM. A resistor may be connected from SCL to VDD to act as
a pull up.
Address pins used to select the Serial Presence Detect base address.
The TEST pin is reserved for bus analysis tools and is not connected on normal memory modules(SO-DIMMs).
Rev. 1.5 Aug. 2005
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