Pin Description; Spd And Thermal Sensor For Ecc Udimms - Samsung M391B5273DH0 Hardware User Manual

Unbuffered DIMM

5. Pin Description

Pin Name Description
A0-A14 SDRAM address bus
BA0-BA2 SDRAM bank select
RAS SDRAM row address strobe
CAS SDRAM column address strobe
WE SDRAM write enable
S0, S1 DIMM Rank Select Lines
CKE0,CKE1 SDRAM clock enable lines
ODT0, ODT1 On-die termination control lines
DQ0 - DQ63 DIMM memory data bus
CB0 - CB7 DIMM ECC check bits
SDRAM data strobes
DQS0 - DQS8
(positive line of differential pair)
SDRAM differential data strobes
DQS0-DQS8
(negative line of differential pair)
SDRAM data masks/high data strobes
DM0-DM8
(x8-based x72 DIMMs)
SDRAM clocks
CK0, CK1
(positive line of differential pair)
SDRAM clocks
CK0, CK1
(negative line of differential pair)
NOTE :
* The V and V pins are tied common to a single power-plane on these designs.
DD DDQ
** 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.
[ Table 1 ] Temperature Sensor Characteristics
Grade
B
Resolution
datasheet
SCL
EVENT WP/EVENT
R1
0 Ω
R2
0 Ω
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.
Range
75 < Ta < 95
40 < Ta < 125
-20 < Ta < 125
Pin Name Description
2
SCL
I C serial bus clock for EEPROM
2
SDA
I C serial bus data line for EEPROM
2
SA0-SA2
I C serial address select for EEPROM
V *
SDRAM core power supply
DD
V *
SDRAM I/O Driver power supply
DDQ
V
SDRAM I/O reference supply
REFDQ
V
SDRAM command/address reference supply
REFCA
V
Power supply return (ground)
SS
V
Serial EEPROM positive power supply
DDSPD
NC Spare Pins(no connect)
Used by memory bus analysis tools
TEST
(unused on memory DIMMs)
RESET Set DRAMs Known State
EVENT Reserved for optional temperature-sensing hardware
V
SDRAM I/O termination supply
TT
RFU Reserved for future use
SA0 SA1 SA2
SA0 SA1 SA2
Temperature Sensor Accuracy
Min. Typ.
- +/- 0.5
- +/- 1.0
- +/- 2.0
0.25
- 6 -
DDR3L SDRAM
SDA
Units
Max.
+/- 1.0
°C
+/- 2.0
+/- 3.0
°C /LSB
Rev. 1.0
NOTE
-
-
-
-