ASFC datasheet(30/42 Pages) ALSC

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HS200 Device Output Timing

tPH parameter is defined to allow device output delay to be longer than tPERIOD. After initialization, the tPH may

have random phase relation to the clock. The Host is responsible to find the optimal sampling point for the

Device outputs, while switching to the HS200 mode.

Figure 20 and Table 29 define Device output timing.

While setting the sampling point of data, a long term drift, which mainly depends on temperature drift,

should be considered. The temperature drift is expressed by

ΔTPH. Output valid data window (tVW) is available

regardless of the drift (

ΔTPH) but position of data window varies by the drift, as described in Figure 21.

Figure 20: HS200 Device Output Timing

Note: VOH denotes VOH(min.) and VOL denotes VOL(max.).

Table 29: Output Timing

Symbol

Min.

Max.

Unit

Remark

tPH

Device output momentary phase from CLK input to CMD or DAT

lines output. Does not include a long term temperature drift.

ΔTPH

-350

(

ΔT=

-20°C)

+1550

(

ΔT=90°C)

Delay variation due to temperature change after tuning. Total

allowable shift of output valid window (TVW) from last system

Tuning procedure

ΔTPH is 2600ps for ΔT from -25°C to 85°C during

operation.

TVW

0.575

tVW=2.88ns at 200MHz Using test circuit in Figure 15 including skew

among CMD and DAT lines created by the Device. Host path may

add Signal Integrity induced noise, skews, etc. Expected TVW at

Host input is larger than 0.475UI.

Note

：Unit Interval (UI) is one bit nominal time. For example, UI=5ns at 200MHz.

Confidential

-30

／42-

Rev.1.0 July 2023

32GB/64GB/128GB eMMC

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