Intel AT80604004884AA Manuel D’Utilisation
Electrical Specifications
28
Intel® Xeon® Processor 7500 Datasheet, Volume 1
The Intel® Xeon® processor 7500 series can tolerate short transient overshoot events
where supplied voltage exceeds the VID/CVID voltage when transitioning from a high-
to-low current load condition. This overshoot cannot exceed VID/CVID + V
where supplied voltage exceeds the VID/CVID voltage when transitioning from a high-
to-low current load condition. This overshoot cannot exceed VID/CVID + V
OS_MAX
.
(V
OS_MAX
is the maximum allowable overshoot above VID/CVID). These specifications
apply to the processor die voltages, as measured with respect to VSSCORESENSE, and
VSSCACHESENSE.
VSSCACHESENSE.
2.5
Intel® QPI and Intel® SMI Interface Differential
Signaling
The Intel® Xeon® processor 7500 series Intel® QPI and Intel
®
SMI signals use
differential links. The termination voltage level for the Intel® Xeon® processor 7500
series for uni-directional serial differential links, each link consisting of a pair of
opposite-polarity (D+, D-) signals is V
series for uni-directional serial differential links, each link consisting of a pair of
opposite-polarity (D+, D-) signals is V
SS
.
Termination resistors are provided on the processor silicon and are terminated to V
SS
.
Intel chipsets also provide on-die termination (ODT), thus eliminating the need to
terminate the links on the system board for the Intel® QPI and Intel
terminate the links on the system board for the Intel® QPI and Intel
®
SMI signals.
illustrates the active ODT. Signal listings are included in
and
.
Table 2-8.
V
CC
and Vcache overshoot Specification
Symbol
Parameter
Min
Max
Unit
s
Figure
Notes
V
OS_MAX
Magnitude of Vcc overshoot above
VID
0.05
V
T
OS_MAX
Time duration of V
CC
overshoot
above VID
25
μs
Figure 2-3. Overshoot Example Waveform
0
5
10
15
20
25
Time [us]
Vo
ltage [V]
VID - 0.000
VID + 0.050
V
OS
T
OS
T
OS
: Overshoot time above VID
V
OS
: Overshoot voltage above VID