K4T56163QI-ZCLCC SAMSUNG [Samsung semiconductor], K4T56163QI-ZCLCC Datasheet - Page 39

• Manufacturer Part Number: K4T56163QI-ZCLCC
• Description: 256Mb I-die DDR2 SDRAM Specification
• Manufacturer: SAMSUNG [Samsung semiconductor]

K4T56163QI
24. tWTR is at lease two clocks (2 x tCK or 2 x nCK) independent of operation frequency.
25. Input waveform timing with single-ended data strobe enabled MR[bit10] = 1, is referenced from the input signal crossing at the VIH(ac) level to the
26. Input waveform timing with single-ended data strobe enabled MR[bit10] = 1, is referenced from the input signal crossing at the VIH(dc) level to the
27. tCKEmin of 3 clocks means CKE must be registered on three consecutive positive clock edges. CKE must remain at the valid input level the entire
28. If tDS or tDH is violated, data corruption may occur and the data must be re-written with valid data before a valid READ can be executed.
29. These parameters are measured from a command/address signal (CKE, CS, RAS, CAS, WE, ODT, BA0, A0, A1, etc.) transition edge to its respec-
30. These parameters are measured from a data strobe signal ((L/U/R)DQS/DQS) crossing to its respective clock signal (CK/CK) crossing. The spec val-
31. These parameters are measured from a data signal ((L/U)DM, (L/U)DQ0, (L/U)DQ1, etc.) transition edge to its respective data strobe signal ((L/U/
32. For these parameters, the DDR2 SDRAM device is characterized and verified to support tnPARAM = RU{tPARAM / tCK(avg)}, which is in clock
33. tDAL [nCK] = WR [nCK] + tnRP [nCK] = WR + RU {tRP [ps] / tCK(avg) [ps] }, where WR is the value programmed in the mode register set.
34. New units, ’tCK(avg)’ and ’nCK’, are introduced in DDR2-667 and DDR2-800. Unit ’tCK(avg)’ represents the actual tCK(avg) of the input clock under
35. Input clock jitter spec parameter. These parameters and the ones in the table below are referred to as 'input clock jitter spec parameters' and these
Clock period jitter
Clock period jitter during DLL locking period
Cycle to cycle clock period jitter
Cycle to cycle clock period jitter during DLL locking period
Cumulative error across 2 cycles
Cumulative error across 3 cycles
Cumulative error across 4 cycles
Cumulative error across 5 cycles
Cumulative error across n cycles, n = 6 ... 10, inclusive
Cumulative error across n cycles, n = 11 ... 50, inclusive
Duty cycle jitter
single-ended data strobe crossing VIH/L(dc) at the start of its transition for a rising signal, and from the input signal crossing at the VIL(ac) level to the
single-ended data strobe crossing VIH/L(dc) at the start of its transition for a falling signal applied to the device under test. The DQS signal must be
monotonic between Vil(dc)max and Vih(dc)min.
single-ended data strobe crossing VIH/L(ac) at the end of its transition for a rising signal, and from the input signal crossing at the VIL(dc) level to the
single-ended data strobe crossing VIH/L(ac) at the end of its transition for a falling signal applied to the device under test. The DQS signal must be
monotonic between Vil(dc)max and Vih(dc)min.
time it takes to achieve the 3 clocks of registration. Thus, after any CKE transition, CKE may not transition from its valid level during the time period
of tIS + 2 x tCK + tIH.
tive clock signal (CK/CK) crossing. The spec values are not affected by the amount of clock jitter applied (i.e. tJIT(per), tJIT(cc), etc.), as the setup
and hold are relative to the clock signal crossing that latches the command/address. That is, these parameters should be met whether clock jitter is
present or not.
ues are not affected by the amount of clock jitter applied (i.e. tJIT(per), tJIT(cc), etc.), as these are relative to the clock signal crossing. That is, these
parameters should be met whether clock jitter is present or not.
R)DQS/DQS) crossing.
cycles, assuming all input clock jitter specifications are satisfied.
For DDR2-667 5-5-5, of which tRP = 15ns, the device will support tnRP = RU{tRP / tCK(avg)} = 5, i.e. as long as the input clock jitter specifications
are met, Precharge command at Tm and Active command at Tm+5 is valid even if (Tm+5 - Tm) is less than 15ns due to input clock jitter.
operation. Unit ’nCK’ represents one clock cycle of the input clock, counting the actual clock edges.
tCK(avg) + tERR(2per),min.
parameters apply to DDR2-667 and DDR2-800 only. The jitter specified is a random jitter meeting a Gaussian distribution.
For example, the device will support tnRP = RU{tRP / tCK(avg)}, which is in clock cycles, if all input clock jitter specifications are met. This means:
Note that in DDR2-400 and DDR2-533, ’tCK’ is used for both concepts.
ex) tXP = 2 [nCK] means; if Power Down exit is registered at Tm, an Active command may be registered at Tm+2, even if (Tm+2 - Tm) is 2 x
Parameter
tERR(11-50per)
tERR(6-10per)
tJIT(per,lck)
tERR(2per)
tERR(3per)
tERR(4per)
tERR(5per)
tJIT(cc,lck)
tJIT(duty)
tJIT(per)
Symbol
tJIT(cc)
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-125
-100
-250
-200
-175
-225
-250
-250
-350
-450
-125
Min
DDR2-667
Max
175
225
250
250
350
450
125
100
250
200
125
-100
-150
-175
-200
-200
-300
-450
-100
-200
-160
Min
-80
DDR2-800
Rev. 1.0 October 2007
Max
100
200
160
150
175
200
200
300
450
100
80
DDR2 SDRAM
units
ps
ps
ps
ps
ps
ps
ps
ps
ps
ps
ps
Notes
35
35
35
35
35
35
35
35
35
35
35