Teledyne LeCroy QPHY-LPDDR2 - Manual (Page 39)

QPHY-LPDDR2 Software Option
QPHY-LPDDR2-OM-G Rev B
39
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.