AS4C128M16D2 datasheet(13/75 Pages) ALSC

Part #	AS4C128M16D2

Description	Auto Refresh and Self Refresh

PDF	75 Pages

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Manufacturer	ALSC [Alliance Semiconductor Corporation]

Direct Link	https://www.alliancememory.com

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13 / 75 page

AS4C128M16D2

Confidential

Version

2.0 – Oct/2014

On-Die Termination (ODT)

On Die Termination (ODT) is a feature that allows a DRAM to turn on/off termination resistance for each DQ,

UDQS/UDQS, LDQS/LDQS, UDM and LDM via the ODT control pin. The ODT feature is designed to improve signal

integrity of the memory channel by allowing the DRAM controller to independently turn on/off termination

resistance for any or all DRAM devices.

The ODT function is supported for ACTIVE and STANDBY modes. ODT is turned off and not supported in SELF

REFRESH mode.

VDDQ

sw1

sw2

sw3

Rval1

Rval2

Rval3

DRAM

Input

Buffer

Rval1

sw1

Rval2

sw2

Rval3

sw3

Input

VSSQ

Switch (sw1, sw2, sw3) is enabled by ODT pin.

VSSQ

Selection among sw1, sw2, and sw3 is determined by “Rtt (nominal)” in EMR. Termination

included on all DQs, UDQS/UDQS, LDQS/LDQS, UDM and LDM pins.

Functional representation of ODT

AS4C128M16D2 Datasheet(PDF) 13 Page - Alliance Semiconductor Corporation