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1Gb: x8, x16 Automotive DDR2 SDRAM - Micron

1Gb: x8, x16 Automotive DDR2 SDRAM - Micron

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Figure 74: PRECHARGE Command-to-Power-Down Entry<br />

CK#<br />

CK<br />

Command<br />

Address<br />

A10<br />

CKE<br />

T0 T1<br />

Valid PRE<br />

Valid<br />

All banks<br />

vs<br />

Single bank<br />

1 x t CK<br />

T2<br />

NOP<br />

Power-down 1<br />

entry<br />

T3<br />

t CKE (MIN)<br />

Don’t Care<br />

Note: 1. The earliest precharge power-down entry may occur is at T2, which is 1 × t CK after the<br />

PRECHARGE command. Precharge power-down entry occurs prior to t RP (MIN) being satisfied.<br />

Figure 75: LOAD MODE Command-to-Power-Down Entry<br />

CK#<br />

CK<br />

Command<br />

T0 T1<br />

Valid LM<br />

Address Valid 1<br />

CKE<br />

t RP 2<br />

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

Power-Down Mode<br />

T2<br />

NOP<br />

t MRD<br />

T3 T4<br />

NOP<br />

Power-down 3<br />

entry<br />

t CKE (MIN)<br />

Don’t Care<br />

Notes: 1. Valid address for LM command includes MR, EMR, EMR(2), and EMR(3) registers.<br />

2. All banks must be in the precharged state and t RP met prior to issuing LM command.<br />

3. The earliest precharge power-down entry is at T3, which is after t MRD is satisfied.<br />

PDF: 09005aef840eff89<br />

1gbddr2_ait_aat.pdf – Rev. C 7/11 EN 119 <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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