Datasheet
Table 17. Processor I/O Overshoot/Undershoot Specifications
Signal Group Maximum
Undershoot
Maximum
Overshoot
Overshoot
Duration
Undershoot
Duration
Notes
Intel QuickPath
Interconnect
-0.2 * V
CCIO_IN
1.2 * V
CCIO_IN
39 ps 15 ps 1, 2
DDR4 -0.22*V
CCD
1.22*V
CCD
0.25*T
CH
0.1*T
CH
1, 2, 3
Processor
Asynchronous
Sideband
Signals
-0.35 * V
CCIO_IN
1.35 * V
CCIO_IN
1.25 ns 0.5 ns 1, 2
System
Reference Clock
(BCLK{0/1})
-0.3V 1.15V N/A N/A 1, 2
PWRGOOD
Signal
-0.420V V
CCIO_IN
+ 0.28 1.25 ns 0.5 ns 3
Notes: 1. These specifications are measured at the processor pad.
2. Refer to Figure 11 on page 46 for description of allowable Overshoot/Undershoot magnitude
and duration.
3. T
CH
is the minimum high pulse width duration.
4. For PWRGOOD DC specifications see Processor Asynchronous Sideband DC Specifications on
page 42 and Figure 10 on page 45.
Figure 10. PWRGOOD SIgnal Waveform
Reference Number: 442505, Revision 1.5 205
Intel Confidential
Electrical Specifications
7.11 Signal Quality
Data transfer requires the clean reception of data signals and clock signals. Ringing
below receiver thresholds, non-monotonic signal edges, and excessive voltage swings
will adversely affect system timings. Ringback and signal non-monotonicity cannot be
tolerated since these phenomena may inadvertently advance receiver state machines.
Excessive signal swings (overshoot and undershoot) are detrimental to silicon gate
oxide integrity, and can cause device failure if absolute voltage limits are exceeded.
Overshoot and undershoot can also cause timing degradation due to the build up of
inter-symbol interference (ISI) effects.
Figure 7-29. PWRGOOD Signal Waveform
A
NM_rise
T
NM
V
overshoot
V
IL_MAX
V
undershoot
V
IH_MIN
A
NM_fall
T
NM
Figure 7-30. DRAM_PWR_OK Signal Waveform
VSS
VCCD (nom = 1.5V)
0.55* VCCD (Ideal
Switching Trip Point)
0.55* VCCD -
200mV
0.55* VCCD + 200mV
Overshoot/Undershoot Magnitude
Magnitude describes the maximum potential difference between a signal and its
voltage reference level. For the processor, both are referenced to VSS. It is important
to note that the overshoot and undershoot conditions are separate and their impact
must be determined independently.
The pulse magnitude and duration must be used to determine if the overshoot/
undershoot pulse is within specifications.
Electrical Specifications—Intel
®
Xeon
®
Processor E5-1600 and E5-2600 v3 Product Families
Intel
®
Xeon
®
Processor E5-1600 and E5-2600 v3 Product Families, Volume 1 of 2, Electrical
September 2014 Datasheet
Order No.: 330783-001 45