Datasheet

t
HZ and
t
LZ transitions occur in the same access time as valid data transitions. These
parameters are referenced to a specific voltage level that specifies when the device out-
put is no longer driving
t
HZDQS and
t
HZDQ, or begins driving
t
LZDQS,
t
LZDQ. Fig-
ure 77 (page 162) shows a method of calculating the point when the device is no longer
driving
t
HZDQS and
t
HZDQ, or begins driving
t
LZDQS,
t
LZDQ, by measuring the signal
at two different voltages. The actual voltage measurement points are not critical as long
as the calculation is consistent. The parameters
t
LZDQS,
t
LZDQ,
t
HZDQS, and
t
HZDQ
are defined as single-ended.
Figure 76: Data Strobe Timing – READs
RL measured
to this point
DQS, DQS#
early strobe
CK
t
LZDQS (MIN)
t
HZDQS (MIN)
DQS, DQS#
late strobe
t
LZDQS (MAX)
t
HZDQS (MAX)
t
DQSCK (MAX)
t
DQSCK (MAX)
t
DQSCK (MAX)
t
DQSCK (MAX)
t
DQSCK (MIN)
t
DQSCK (MIN)
t
DQSCK (MIN)
t
DQSCK (MIN)
CK#
t
RPRE
t
QSH
t
QSH
t
QSL
t
QSL
t
QSL
t
QSL
t
QSH
t
QSH
Bit 0 Bit 1 Bit 2 Bit 7
t
RPRE
Bit 0 Bit 1 Bit 2 Bit 7Bit 6Bit 3 Bit 4 Bit 5
Bit 6Bit 4Bit 3 Bit 5
t
RPST
t
RPST
T0 T1 T2 T3 T4 T5 T6
8Gb: x4, x8, x16 DDR3L SDRAM
READ Operation
161
Rev 2.0 June 2016
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