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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Figure 77: Data Strobe Timing – READs<br />
CK<br />
CK#<br />
DQS, DQS#<br />
early strobe<br />
DQS, DQS#<br />
late strobe<br />
t LZDQS (MIN)<br />
t HZ and t LZ transitions occur in the same access time as valid data transitions. These<br />
parameters are referenced to a specific voltage level that specifies when the device output<br />
is no longer driving t HZDQS and t HZDQ, or begins driving t LZDQS, t LZDQ. Figure<br />
78 (page 166) shows a method of calculating the point when the device is no longer<br />
driving t HZDQS and t HZDQ, or begins driving t LZDQS, t LZDQ, by measuring the signal<br />
at two different voltages. The actual voltage measurement points are not critical as long<br />
as the calculation is consistent. The parameters t LZDQS, t LZDQ, t HZDQS, and t HZDQ<br />
are defined as single-ended.<br />
t RPRE<br />
t LZDQS (MAX)<br />
RL measured<br />
to this point<br />
t DQSCK (MIN) t DQSCK (MIN) t DQSCK (MIN) t DQSCK (MIN)<br />
t QSH<br />
t QSL<br />
t QSH<br />
t QSL<br />
Bit 0 Bit 1 Bit 2 Bit 3 Bit 4 Bit 5 Bit 6 Bit 7<br />
t RPRE<br />
t DQSCK (MAX) t DQSCK (MAX) t DQSCK (MAX) t DQSCK (MAX)<br />
t QSH<br />
t QSL<br />
t QSH<br />
t QSL<br />
<strong>2Gb</strong>: <strong>x4</strong>, <strong>x8</strong>, <strong>x16</strong> <strong>DDR3</strong> <strong>SDRAM</strong><br />
READ Operation<br />
T0 T1 T2 T3 T4 T5 T6<br />
t HZDQS (MIN)<br />
t RPST<br />
Bit 0 Bit 1 Bit 2 Bit 3 Bit 4 Bit 5 Bit 6 Bit 7<br />
t HZDQS (MAX)<br />
PDF: 09005aef826aaadc<br />
<strong>2Gb</strong>_<strong>DDR3</strong>_<strong>SDRAM</strong>.pdf – Rev. P 2/12 EN 165 <strong>Micron</strong> Technology, Inc. reserves the right to change products or specifications without notice.<br />
� 2006 <strong>Micron</strong> Technology, Inc. All rights reserved.<br />
t RPST