Samsung M391B5273DH0 Pin Description, SPD and Thermal Sensor for ECC UDIMMs, Pin Name Description

Unbuffered DIMM

datasheet

Rev. 1.0

DDR3L SDRAM

5. Pin Description

Pin Name	Description		Pin Name	Description
A0-A14	SDRAM address bus	SCL		I2C serial bus clock for EEPROM
BA0-BA2	SDRAM bank select	SDA		I2C serial bus data line for EEPROM
	SDRAM row address strobe	SA0-SA2		I2C serial address select for EEPROM
RAS
	SDRAM column address strobe		VDD*	SDRAM core power supply
CAS
	SDRAM write enable		VDDQ*	SDRAM I/O Driver power supply
WE
	DIMM Rank Select Lines		VREFDQ	SDRAM I/O reference supply
S0, S1
CKE0,CKE1	SDRAM clock enable lines		VREFCA	SDRAM command/address reference supply
ODT0, ODT1	On-die termination control lines		VSS	Power supply return (ground)
DQ0 - DQ63	DIMM memory data bus		VDDSPD	Serial EEPROM positive power supply
CB0 - CB7	DIMM ECC check bits	NC		Spare Pins(no connect)
DQS0 - DQS8	SDRAM data strobes		TEST	Used by memory bus analysis tools
	(positive line of differential pair)			(unused on memory DIMMs)
	SDRAM differential data strobes
DQS0-DQS8			RESET	Set DRAMs Known State
	(negative line of differential pair)
DM0-DM8	SDRAM data masks/high data strobes			Reserved for optional temperature-sensing hardware
			EVENT
	(x8-based x72 DIMMs)
CK0, CK1	SDRAM clocks		VTT	SDRAM I/O termination supply
	(positive line of differential pair)
	SDRAM clocks
CK0, CK1			RFU	Reserved for future use
	(negative line of differential pair)

NOTE :

*The VDD and VDDQ pins are tied common to a single power-plane on these designs.

**DM8, DQS8 and DQS8 are for ECC UDIMM only.

6. SPD and Thermal Sensor for ECC UDIMMs

On DIMM thermal sensor will provide DRAM temperature readout through a integrated thermal sensor.

	SCL					SDA
EVENT			WP/EVENT
	R1
			SA0	SA1	SA2
	0 Ω
		R2
		0 Ω
			SA0	SA1	SA2

NOTE :

1.Raw Cards D (1Rx8 ECC) and E (2Rx8 ECC) support a thermal sensor.

2.When the SPD and the thermal sensor are placed on the module, R1 is placed but R2 is not. When only the SPD is placed on the module, R2 is placed but R1 is not.

[ Table 1 ] Temperature Sensor Characteristics

Grade	Range	Temperature Sensor Accuracy			Units	NOTE
		Min.	Typ.	Max.
	75 < Ta < 95	-	+/- 0.5	+/- 1.0		-
B	40 < Ta < 125	-	+/- 1.0	+/- 2.0	°C	-
	-20 < Ta < 125	-	+/- 2.0	+/- 3.0		-
	Resolution		0.25		°C /LSB	-
		- 6 -