H5PS1G63EFR HYNIX [Hynix Semiconductor], H5PS1G63EFR Datasheet - Page 36

• Manufacturer Part Number: H5PS1G63EFR
• Description: 1Gb DDR2 SDRAM
• Manufacturer: HYNIX [Hynix Semiconductor]

Rev. 0.4 / Nov 2008
10. The maximum limit for this parameter is not a device limit. The device will operate with a greater value for
this parameter, but system performance (bus turnaround) will degrade accordingly.
11. MIN (t CL, t CH) refers to the smaller of the actual clock LOW time and the actual clock HIGH time as
provided to the device (i.e. this value can be greater than the minimum specification limits for t CL and t CH).
For example, t CL and t CH are = 50% of the period, less the half period jitter (t JIT(HP)) of the clock source,
and less the half period jitter due to crosstalk (t JIT(crosstalk)) into the clock traces.
12. t QH = t HP – t QHS, where:
13. tDQSQ: Consists of data pin skew and output pattern effects, and p-channel to n-channel variation of the
output drivers as well as output slew rate mismatch between DQS/ DQS and associated DQ in any given cycle.
14. t DAL = (nWR) + (tRP/tCK):
For each of the terms above, if not already an integer, round to the next highest integer. tCK refers to the appli-
cation clock period. nWR refers to the t WR parameter stored in the MR.
Example: For DDR533 at t CK = 3.75 ns with t WR programmed to 4 clocks. tDAL = 4 + (15 ns / 3.75 ns)
clocks =4 +(4)clocks=8clocks.
15. The clock frequency is allowed to change during self–refresh mode or precharge power-down mode.
In case of clock frequency change during precharge power-down, a specific procedure is required as described
in section 2.9.
16. ODT turn on time min is when the device leaves high impedance and ODT resistance begins to turn on.
17. ODT turn off time min is when the device starts to turn off ODT resistance.
18. tHZ and tLZ transitions occur in the same access time as valid data transitions. These parameters are
referenced to a specific voltage level which specifies when the device output is no longer driving (tHZ), or
begins driving (tLZ). Below figure shows a method to calculate the point when device is no longer driving
(tHZ), or begins driving (tLZ) by measuring the signal at two different voltages. The actual voltage measure-
ment points are not critical as long as the calculation is consistent.
tHP = minimum half clock period for any given cycle and is defined by clock HIGH or clock LOW (tCH, tCL).
tQHS accounts for:
ODT turn off time max is when the bus is in high impedance. Both are measured from tAOFD.
ODT turn on time max is when the ODT resistance is fully on. Both are measured from tAOND.
1) The pulse duration distortion of on-chip clock circuits; and
2) The worst case push-out of DQS on one transition followed by the worst case pull-in of DQ on the
next transition, both of which are, separately, due to data pin skew and output pattern effects, and
p-channel to n-channel variation of the output drivers.
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36