H5PS1G43EFR
H5PS1G83EFR
H5PS1G63EFR
19. tRPST end point and tRPRE begin point are not referenced to a specific voltage level but specify when
the device output is no longer driving (tRPST), or begins driving (tRPRE). Below figure shows a method to
calculate these points when the device is no longer driving (tRPST), or begins driving (tRPRE). Below Fig-
ure shows a method to calculate these points when the device is no longer driving (tRPST), or begins driv-
ing (tRPRE) by measuring the signal at two different voltages. The actual voltage measurement points are
not critical as long as the calculation is consistent.
VOH + xmV
VTT + 2xmV
VTT + xmV
VOH + 2xmV
tHZ
tLZ
tRPST end point
tRPRE begin point
T1
T2
VOL + 1xmV
VOL + 2xmV
VTT -xmV
T1
VTT - 2xmV
T2
tHZ , tRPST end point = 2*T1-T2
tLZ , tRPRE begin point = 2*T1-T2
20. Input waveform timing with differential data strobe enabled MR[bit10] =0, is referenced from the input
signal crossing at the V (ac) level to the differential data strobe crosspoint for a rising signal, and from
IH
the input signal crossing at the V (ac) level to the differential data strobe crosspoint for a falling signal
IL
applied to the device under test.
21. Input waveform timing with differential data strobe enabled MR[bit10]=0, is referenced from the input
signal crossing at the V (dc) level to the differential data strobe crosspoint for a rising signal and V (dc)
IH
IL
to the differential data strobe crosspoint for a falling signal applied to the device under test.
Differential Input waveform timing
DQS
DQS
tDS tDH
tDS tDH
VDDQ
VIH(ac)min
VIH(dc)min
VREF(dc)
VIL(dc)max
VIL(ac)max
VSS
Rev. 0.4 / Nov 2008
37
HYNIX [ HYNIX SEMICONDUCTOR ]
