AS4C64M8D2 datasheet(31/59 Pages) ALSC

31 / 59 page

AS4C64M8D2

Confidential

Rev. 1.0

Feb. /2014

Table 28. Input clock jitter spec parameter

Parameter

Symbol

-25

-3

Units Notes

Min.

Max.

Min.

Max.

Clock period jitter

tJIT (per)

-100

100

-125

125

Clock period jitter during DLL locking

period

tJIT (per,lck)

-80

-100

100

Cycle to cycle clock period jitter

tJIT (cc)

-200

200

-250

250

Cycle to cycle clock period jitter during

DLL locking period

tJIT (cc,lck)

-160

160

-200

200

Cumulative error across 2 cycles

tERR (2per)

-150

150

-175

175

Cumulative error across 3 cycles

tERR (3per)

-175

175

-225

225

Cumulative error across 4 cycles

tERR (4per)

-200

200

-250

250

Cumulative error across 5 cycles

tERR (5per)

-200

200

-250

250

Cumulative error across n cycles,

n=6...10, inclusive

tERR (6-10per)

-300

300

-350

350

Cumulative error across n cycles,

n=11...50, inclusive

tERR (11-50per)

-450

450

-450

450

Duty cycle jitter

tJIT (duty)

-100

100

-125

125

NOTE 34: These parameters are specified per their average values, however it is understood that the following

relationship between the average timing and the absolute instantaneous timing holds at all times. (Min and

max of SPEC values are to be used for calculations in the table below.)

Table 29. Absolute clock period average values

Parameter

Symbol

Min.

Max.

Unit

Absolute clock period

tCK (abs)

tCK(avg),min + tJIT(per),min

tCK(avg),max + tJIT(per),max

Absolute clock HIGH pulse width

tCH (abs)

tCH(avg),min * tCK(avg),min +

tJIT(duty),min

tCH(avg),max * tCK(avg),max +

tJIT(duty),max

Absolute clock LOW pulse width

tCL (abs)

tCL(avg),min * tCK(avg),min +

tJIT(duty),min

tCL(avg), max * tCK(avg),max +

tJIT(duty), max

NOTE 35: tHP is the minimum of the absolute half period of the actual input clock. tHP is an input parameter but not

an input specification parameter. It is used in conjunction with tQHS to derive the DRAM output timing tQH. The

value to be used for tQH calculation is determined by the following equation;

tHP = Min ( tCH(abs), tCL(abs) ),

where,

tCH(abs) is the minimum of the actual instantaneous clock HIGH time;

tCL(abs) is the minimum of the actual instantaneous clock LOW time;

NOTE 36: tQHS accounts for:

1) The pulse duration distortion of on-chip clock circuits, which represents how well the actual tHP at the input is

transferred to the output; and

2) The worst case push-out of DQS on one transition followed by the worst case pull-in of DQ on the next

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