Electrical Specifications
Table 2-10. Link Speed Independent Specifications (Sheet 2 of 2)
Symbol
Parameter
Min
Nom
Max
Unit
Notes
T
Skew between first to last
data termination meeting
RX_LOW_CM_DC
128
1.5
20K
32
UI
μs
UI
DATA_TERM_SKEW
Z
T
Time taken by inband
reset detector to sense
Inband Reset
INBAND_RESET_
SENSE
Tclk
Time taken by clock
detector to observe clock
stability
_DET
T
Time taken by clock
frequency detector to
decide slow vs.
Reference Clock
Cycles
CLK_FREQ_DET
operational clock after
stable clock
T
T
Phase variability between
reference Clk (at Tx input)
and Tx output.
500
psec
psec
UI
Refclk-Tx-Variability
Refclk-Rx-Variability
D+/D-RX-Skew
Phase variability between 1000
reference Clk (at Rx
input) and Rx output.
L
Phase skew between D+
and D- lines for any data
bit at Rx
0.03
BER
Bit Error Rate per lane
1.0E-14
VIO
Events
mV
mV
V
Lane
valid for 4.8 and 6.4 GT/s
Voh_bscan
Vol_bscan
Vih_bcan
Vil_bscan
Output high during
boundary scan
VIO-100
Output low during
boundary scan
0
100
Input high during
boundary scan
0.86 * VIO
Output low during
boundary scan
0.40 * VIO
V
Notes:
1.
Return loss specifications for receiver package are not provided. However, maintaining a well impedance
matched and low loss receiver package is crucial for a successful silicon operation, including maintaining as
low as possible on-die capacitance.
2.
Used during initialization. It is the state of “OFF” condition for the receiver when only the minimum
termination is connected
2.5.2
Intel QPI Electrical Specifications
The applicability of this section applies to Intel QPI within a links-based Enterprise MP
class server platform. This section contains information for slow boot up speed (1/4
frequency of the reference clock), 4.8 GT/s, and 6.4 GT/s.
The transfer rates available for the Intel Xeon Processor E7-8800/4800/2800 Product
Families processor are shown in Table 2-11.
Table 2-11. Clock Frequency Table
Intel QPI System Interface
Forwarded Clock Frequency
Intel QPI System Interface
Data Transfer Rate
1
33.33 MHz
2.40 GHz
3.20 GHz
66.66 MT/s
4.8 GT/s
6.4 GT/s
30
Datasheet Volume 1 of 2
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