Intel C2518 FH8065501516710 Data Sheet

Intel

®

 Atom™ Processor C2000 Product Family for Microserver

Datasheet, Vol. 3 of 3

September 2014

582

Order Number: 330061-002US

DDR3_1_ODT[3:0]

O

DDR

4

VDDR

DDR3 On-Die Termination 

Enable: (active high). ODT 

(registered HIGH) enables 

termination resistance 

internal to the DDR device 

SDRAM. When the ODT 

feature is enabled, it is 

dynamically enabled for the 

receiver of the data. The SoC 

does this internally for read 

data returning from the DRAM 

devices. For write data to the 

DRAM devices, the M_ODT[] 

pins are asserted to enable 

ODT within the DRAM devices 

themselves. Because ODT 

consumes power, when the 

feature is enabled, it is control 

dynamically by the SoC. ODT 

impacts the DQ, DQS, and DM 

signals. The ODT pin is 

ignored by the DDR devices if 

the EMR(1) is programmed to 

disable ODT. One pin per rank.

DDR3_1_RASB

O

DDR

1

VDDR

DDR3 Row Address Strobe: 

(active low). Used with CASB 

and RASB (along with CSB) to 

define commands. RAS, CAS, 

and WE (along with CS) define 

the command being entered.

DDR3_1_CASB

O

DDR

1

VDDR

DDR3 Column Address 

Strobe: (active low). Used 

with CAS#, RAS#, and CS# to 

define commands. RAS, CAS, 

and WE (along with CS) define 

the command being entered.

DDR3_1_WEB

O

DDR

1

VDDR

DDR3 Write Enable: (active 

low). Used with CAS#, RAS#, 

and CS# to define commands. 

RAS, CAS, and WE (along with 

CS) define the command 

being entered.

DDR3_1_DRAM_PWROK

I

DDR

1

VDDR

DRAM POWER OK. An active 

high signal indicates that the 

DDR PHY voltage (VDDR) is 

good.

DDR3_1_DRAMRSTB

O

DDR

1

VDDR

For resetting the DDR DIMMs.

DDR3_1_VCCA_PWROK

I

DDR

1

VDDR

DDR3 Indication to the DDRIO 

that the SoC core well voltage 

is valid. This is connected to 

the SoC input COREPWROK 

(except they are different 

voltages).

DDR3_1_VREF

I

DDR

1

100 1%, 

PD

VDDR

External Vref from the resistor 

divider on board.

DDR3_1_ODTPU

I/O

DDR

1

VDDR

DDR3 Compensation Pad. 

Board trace + External 

Precision resistor = 275. The 

resistor is pulled-down to 

VSS.