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1Gb: x8, x16 Automotive DDR2 SDRAM - Micron

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Figure 70: WRITE-to-Power-Down or Self Refresh Entry<br />

CK#<br />

CK<br />

Command<br />

CKE<br />

Address<br />

A10<br />

DQS, DQS#<br />

DQ<br />

T0 T1 T2<br />

WRITE<br />

Valid<br />

NOP NOP<br />

NOP<br />

WL = 3<br />

T3 T4 T5<br />

DO<br />

Valid Valid<br />

DO DO DO<br />

T6<br />

Valid<br />

t WTR<br />

T7 T8<br />

NOP1<br />

Power-down or<br />

self refresh entry1<br />

Transitioning Data<br />

tCKE (MIN)<br />

Note: 1. Power-down or self refresh entry may occur after the WRITE burst completes.<br />

Figure 71: WRITE with Auto Precharge-to-Power-Down or Self Refresh Entry<br />

CK#<br />

CK<br />

Command<br />

CKE<br />

Address<br />

A10<br />

DQS, DQS#<br />

DQ<br />

T0 T1 T2<br />

WRITE<br />

Valid<br />

NOP NOP<br />

NOP<br />

WL = 3<br />

T3 T4 T5<br />

DO<br />

Valid Valid<br />

DO DO DO<br />

<strong>1Gb</strong>: <strong>x8</strong>, <strong>x16</strong> <strong>Automotive</strong> <strong>DDR2</strong> <strong>SDRAM</strong><br />

Power-Down Mode<br />

WR2<br />

Indicates a break in<br />

time scale<br />

Ta0<br />

Valid1 NOP<br />

Transitioning Data<br />

Ta1 Ta2<br />

Power-down or<br />

self refresh entry<br />

t CKE (MIN)<br />

Don’t Care<br />

Don’t Care<br />

Notes: 1. Internal PRECHARGE occurs at Ta0 when WR has completed; power-down entry may occur<br />

1 x t CK later at Ta1, prior to t RP being satisfied.<br />

2. WR is programmed through MR9–MR11 and represents ( t WR [MIN] ns/ t CK) rounded up<br />

to next integer t CK.<br />

PDF: 09005aef840eff89<br />

1gbddr2_ait_aat.pdf – Rev. C 7/11 EN 117 <strong>Micron</strong> Technology, Inc. reserves the right to change products or specifications without notice.<br />

� 2010 <strong>Micron</strong> Technology, Inc. All rights reserved.

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