Teledyne LeCroy QPHY-LPDDR2 - Manual (Page 45)

QPHY-LPDDR2 Software Option
QPHY-LPDDR2-OM-G Rev B
45
tHZ(DQ), DQ High Impedance Time From CK/CK#
This is the time from Vref of the CK/CK# signal to the point when the DQ is not being driven anymore (at
the end of the burst)
tLZ(DQ), DQ Low-Impedance Time from CK/CK#
This is the time from when the DQ begins to be driven (at the beginning of the burst) to the nearest
CK/CK# edge.
tLZ(DQS), DQS Low-Impedance Time from CK/CK#
This is the time from when the DQS begins to be driven (at the beginning of the preamble) to the nearest
CK/CK# edge.
tRPRE, Read Preamble
Time from when DQS begins to be driven (at the beginning of the preamble) to when it crosses Vref. This
is only measured on a read cycle.
Prerequisite: tJIT(per), a derating factor is applied to the limit depending on the clock jitter.
tRPST, Read Postamble
Time from when DQS crosses Vref (at the beginning of the postamble) to when DQS stops being driven
(at the end of the postamble). This is only measured on a read cycle.
Prerequisite: tJIT(duty), a derating factor is applied to the limit depending on the clock jitter.