1Gb: x4, x8, x16 DDR3 SDRAM
Command and Address Setup, Hold, and Derating
Command and Address Setup, Hold, and Derating
The total tIS (setup time) and tIH (hold time) required is calculated by adding the data
sheet tIS (base) and tIH (base) values (see Table 58; values come from Table 56
(page 09)) to the ΔtIS and ΔtIH derating values (see Table 59 (page 1±±) and Table 6±
(page 1±±)), respectively. Example: tIS (total setup time) = tIS (base) + ΔtIS. For a valid
transition, the input signal has to remain above/below VIH(AC)/VIL(AC) for some time
tVAC (see Table 6± (page 1±±)).
Although the total setup time for slow slew rates might be negative (for example, a valid
input signal will not have reached VIH(AC)/VIL(AC) at the time of the rising clock transi-
tion), a valid input signal is still required to complete the transition and to reach
VIH(AC)/VIL(AC) (see Figure 15 (page 49) for input signal requirements). For slew rates that
fall between the values listed in Table 6± (page 1±±) and Table 63 (page 1±2), the derat-
ing values may be obtained by linear interpolation.
Setup (tIS) nominal slew rate for a rising signal is defined as the slew rate between the
last crossing of VREF(DC) and the first crossing of VIH(AC)min. Setup (tIS) nominal slew rate
for a falling signal is defined as the slew rate between the last crossing of VREF(DC) and
the first crossing of VIL(AC)max. If the actual signal is always earlier than the nominal slew
rate line between the shaded VREF(DC)-to-AC region, use the nominal slew rate for derat-
ing value (see Figure 34 (page 1±3)). If the actual signal is later than the nominal slew
rate line anywhere between the shaded VREF(DC)-to-AC region, the slew rate of a tangent
line to the actual signal from the AC level to the DC level is used for derating value (see
Figure 36 (page 1±5)).
Hold (tIH) nominal slew rate for a rising signal is defined as the slew rate between the
last crossing of VIL(DC)max and the first crossing of VREF(DC). Hold (tIH) nominal slew rate
for a falling signal is defined as the slew rate between the last crossing of VIH(DC)min and
the first crossing of VREF(DC). If the actual signal is always later than the nominal slew
rate line between the shaded DC-to-VREF(DC) region, use the nominal slew rate for derat-
ing value (see Figure 35 (page 1±4)). If the actual signal is earlier than the nominal slew
rate line anywhere between the shaded DC-to-VREF(DC) region, the slew rate of a tangent
line to the actual signal from the DC level to the VREF(DC) level is used for derating value
(see Figure 30 (page 1±6)).
Table 58: Command and Address Setup and Hold Values Referenced – AC/DC-Based
Symbol
800
200
350
–
1066
125
275
–
1333
65
1600
45
1866
–
2133
–
Unit
ps
Reference
VIH(AC)/VIL(AC)
VIH(AC)/VIL(AC)
VIH(AC)/VIL(AC)
VIH(AC)/VIL(AC)
VIH(DC)/VIL(DC)
tIS(base, AC175)
tIS(base, AC150)
tIS(base, AC135)
tIS(base, AC125)
tIH(base, DC100)
190
–
170
–
–
–
ps
65
60
ps
–
–
–
–
150
100
135
95
ps
275
200
140
120
ps
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1Gb_DDR3_SDRAM.pdf - Rev. L 03/13 EN
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