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2Gb: x4, x8, x16 DDR3 SDRAM - Micron

2Gb: x4, x8, x16 DDR3 SDRAM - Micron

2Gb: x4, x8, x16 DDR3 SDRAM - Micron

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PDF: 09005aef826aaadc<br />

<strong>Micron</strong> Technology, Inc. reserves the right to change products or specifications without notice.<br />

<strong>2Gb</strong>_<strong>DDR3</strong>_<strong>SDRAM</strong>.pdf – Rev. P 2/12 EN 196 � 2006 <strong>Micron</strong> Technology, Inc. All rights reserved.<br />

Figure 108: Dynamic ODT: ODT Asserted Before and After the WRITE, BC4<br />

CK#<br />

CK<br />

Command<br />

Address<br />

ODT<br />

R TT<br />

DQS, DQS#<br />

DQ<br />

T0 T1 T2 T3 T4 T5 T6 T7 T8 T9<br />

Valid<br />

ODTLon ODTLcwn4<br />

ODTLcnw<br />

WL<br />

T10 T11 T12 T13 T14 T15 T16 T17<br />

NOP NOP NOP NOP WRS4 NOP NOP NOP NOP NOP NOP NOP NOP NOP NOP NOP NOP NOP<br />

ODTH4<br />

t AON (MIN)<br />

ODTH4<br />

RTT,nom<br />

DI<br />

n<br />

R TT(WR)<br />

DI<br />

n + 1<br />

DI<br />

n + 2<br />

DI<br />

n + 3<br />

R TT,nom<br />

ODTLoff<br />

t ADC (MIN) tADC (MIN) t AOF (MIN)<br />

t AON (MAX) tADC (MAX) t ADC (MAX)<br />

Transitioning<br />

t AOF (MAX)<br />

Notes: 1. Via MRS or OTF. AL = 0, CWL = 5. R TT,nom and R TT(WR) are enabled.<br />

2. ODTH4 applies to first registering ODT HIGH and then to the registration of the WRITE command. In this example,<br />

ODTH4 is satisfied if ODT goes LOW at T8 (four clocks after the WRITE command).<br />

Figure 109: Dynamic ODT: Without WRITE Command<br />

CK#<br />

CK<br />

R TT<br />

T0 T1 T2 T3 T4 T5 T6 T7 T8 T9<br />

ODTLoff<br />

T10 T11<br />

Command Valid Valid Valid Valid Valid Valid Valid Valid Valid Valid Valid Valid<br />

Address<br />

ODT<br />

DQS, DQS#<br />

DQ<br />

ODTH4<br />

ODTLon<br />

t AON (MAX)<br />

t AON (MIN)<br />

R TT,nom<br />

t AOF (MIN)<br />

t AOF (MAX)<br />

Transitioning<br />

Don’t Care<br />

Notes: 1. AL = 0, CWL = 5. R TT,nom is enabled and R TT(WR) is either enabled or disabled.<br />

2. ODTH4 is defined from ODT registered HIGH to ODT registered LOW; in this example, ODTH4 is satisfied. ODT registered<br />

LOW at T5 is also legal.<br />

Don’t Care<br />

<strong>2Gb</strong>: <strong>x4</strong>, <strong>x8</strong>, <strong>x16</strong> <strong>DDR3</strong> <strong>SDRAM</strong><br />

Dynamic ODT

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