NT5CB128M8GP-EKB datasheet(79/160 Pages) NANYA

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Version 2.2

Nanya Technology Cooperation ©

04/2019

NTC Proprietary

Level: Property

DDR3(L) 1Gb SDRAM

NT5CB(C)128M8GN / NT5CB(C)64M16GP

Asynchronous ODT Mode

Asynchronous ODT mode is selected when DRAM runs in DLLon mode, but DLL is temporarily disabled (i.e. frozen) in

precharge power-down (by MR0 bit A12). Based on the power down mode definitions, this is currently Precharge power

down mode if DLL is disabled during precharge power down by MR0 bit A12.

In asynchronous ODT timing mode, internal ODT command is NOT delayed by Additive Latency (AL) relative to the

external ODT command.

In asynchronous ODT mode, the following timing parameters apply: tAONPD min/max, tAOFPD min/max.

Minimum RTT turn-on time (tAONPD min) is the point in time when the device termination circuit leaves high impedance state

and ODT resistance begins to turn on. Maximum RTT turn on time (tAONPD max) is the point in time when the ODT

resistance is fully on.

tAONPDmin and tAONPDmax are measured from ODT being sampled high.

Minimum RTT turn-off time (tAOFPDmin) is the point in time when the devices termination circuit starts to turn off the ODT

resistance. Maximum ODT turn off time (tAOFPDmax) is the point in time when the on-die termination has reached high

impedance. tAOFPDmin and tAOFPDmax are measured from ODT being sample low.

Asynchronous ODT Timings on DDR3(L) SDRAM with fast ODT transition: AL is

ignored.

In Precharge Power Down, ODT receiver remains active; however no Read or Write command can be issued, as the

respective ADD/CMD receivers may be disabled.

Asynchronous ODT Timing Parameters for all Speed Bins

Symbol

Description

Min.

Max.

Unit

tAONPD

Asynchronous RTT turn-on delay (Power-Down with DLL frozen)

8.5

tAOFPD

Asynchronous RTT turn-off delay (Power-Down with DLL frozen)

8.5

CK#

T11

T10

ODT

RTT

tAONPDmin

CKE

tIH

tIS

T12

T13

T14

T15

tAONPDmax

tAOFPDmin

tAOFPDmax

tIH

tIS

Do not

care

Transitioning

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