Teledyne-lecroy QPHY-LPDDR2 Manuel d'utilisateur télécharger pdf (Page 44)

QPHY-LPDDR2-OM-G Rev B

Figure 24. Data output (read) timing [JESD208-2B figure 23]

tQHS, DQ hold skew factor

This measures DQ at VIH(dc) or VIL(dc) to DQS at VREF

tQH, DQ/DQS Output Hold Time From DQS

This measures the timing from DQS at VREF to DQ at VIH(dc) (rising edge) or VIL(dc) (falling edge).

tQH = tQHP - tQHS

tDQSCK, DQS Output Access Time from CK/CK #

Time from CK at VREF level to DQS at VREF level.

Figure 25. Burst read operation [JESD209-2D figure 25]

This is a measure similar to tDQSS but on the Read.

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Teledyne-lecroy QPHY-LPDDR2 Manuel d'utilisateur Page 44