h5ps2g43afr Hynix Semiconductor, h5ps2g43afr Datasheet - Page 34

• Manufacturer Part Number: h5ps2g43afr
• Description: Ddr2 Sdram
• Manufacturer: Hynix Semiconductor

Rev. 0.1 / November 2008
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 Figure shows a
method to calculate these points when the device is no longer driving (tRPST), or begins driving (tRPRE) by
measuring the signal at two different voltages. The actual voltage measurement points are not critical as long
as the calculation is consistent.
20. Input waveform timing with differential data strobe enabled MR[bit10] =0, is referenced from the input
signal crossing at the V
input signal crossing at the V
the device under test.
21. Input waveform timing with differential data strobe enabled MR[bit10]=0, is referenced from the input sig-
nal crossing at the V
differential data strobe crosspoint for a falling signal applied to the device under test.
tRPST end point
tHZ , tRPST end point = 2*T1-T2
tHZ
IH
(dc) level to the differential data strobe crosspoint for a rising signal and V
T1
IH
DQS
DQS
(ac) level to the differential data strobe crosspoint for a rising signal, and from the
IL
(ac) level to the differential data strobe crosspoint for a falling signal applied to
T2
Differential Input waveform timing
VOH + xmV
VOL + 1xmV
VOL + 2xmV
VOH + 2xmV
tDS
tDH
tDS
VTT + 2xmV
VTT - 2xmV
tLZ , tRPRE begin point = 2*T1-T2
VTT + xmV
VTT -xmV
tDH
T1
T2
V
V
V
V
V
V
V
IL(ac)
DDQ
IH(ac)
IH(dc)
REF
IL(dc)
SS
(dc)
max
max
min
min
tLZ
tRPRE begin point
H5PS2G43AFR
H5PS2G83AFR
IL
(dc) to the
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