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QPHY-LPDDR2 Software Option

QPHY-LPDDR2-OM-G Rev B

tCH(avg), Average High Pulse Width

tCH(avg) is defined as the average high pulse width, as calculated across any consecutive 200 high

pulses.

tCH(avg) = SUM(tCHi) / (200 x tCK(avg)) where I = 1 to 200

See Figure 20 as follows.

tCL(avg), Average Low Pulse Width

tCL(avg) is defined as the average low pulse width, as calculated across any consecutive 200 low pulses.

tCL(avg) = SUM(tCLi) / (200 x tCK(avg)) where i=1 to 200

See Figure 20 as follows.

Figure 20. Data output (read) timing [JESD209-2D figure 23]

tCH(abs), Absolute High Pulse Width

tCH(abs) is defined as the absolute high pulse width, of each of 200 consecutive high pulses.

tCL(abs), Absolute Low Pulse Width

tCL(abs) is defined as the absolute low pulse width of each of 200 consecutive low pulses.

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Teledyne-lecroy QPHY-LPDDR2 Manuale Utente Pagina 39