Intel E3-1275 CM8062307262003 User Manual
Product codes
CM8062307262003
Electrical Specifications
86
Datasheet, Volume 1
Notes:
1.
1.
Refer to the PCI Express Base Specification for more details.
2.
V
TX-AC-CM-PP
and V
TX-AC-CM-P
are defined in the PCI Express Base Specification. Measurement is made over
at least 10^
6
UI.
3.
As measured with compliance test load. Defined as 2*|V
TXD+
V
TXD-
|.
4.
COMP resistance must be provided on the system board with 1% resistors.
5.
PEG_ICOMPO, PEG_COMPI, PEG_RCOMPO are the same resistor.
6.
RMS value.
7.
Measured at Rx pins into a pair of 50- terminations into ground. Common mode peak voltage is defined by
the expression: max{|(Vd+ - Vd-) - V-CMDC|}.
the expression: max{|(Vd+ - Vd-) - V-CMDC|}.
8.
DC impedance limits are needed to ensure Receiver detect.
9.
The Rx DC Common Mode Impedance must be present when the Receiver terminations are first enabled to
ensure that the Receiver Detect occurs properly. Compensation of this impedance can start immediately
and the 15 Rx Common Mode Impedance (constrained by RLRX-CM to 50
ensure that the Receiver Detect occurs properly. Compensation of this impedance can start immediately
and the 15 Rx Common Mode Impedance (constrained by RLRX-CM to 50
±20%) must be within the
specified range by the time Detect is entered.
10. Low impedance defined during signaling. Parameter is captured for 5.0 GHz by RLTX-DIFF.
11. These are pre-silicon estimates and are subject to change.
11. These are pre-silicon estimates and are subject to change.
Table 7-10. PCIe DC Specifications
Symbol
Parameter
Min
Typ
Max
Units
Notes
1,11
V
TX-DIFF-p-p Low
Low differential peak to peak Tx voltage
swing
swing
0.4
0.5
0.6
V
3
V
TX-DIFF-p-p
Differential peak to peak Tx voltage swing
0.8
1
1.2
V
3
V
TX_CM-AC-p
Tx AC Peak Common Mode Output
Voltage (Gen1 only)
Voltage (Gen1 only)
20
mV
1, 2, 6
V
TX_CM-AC-p-p
Tx AC Peak Common Mode Output
Voltage (Gen2 only)
Voltage (Gen2 only)
100
mV
1, 2
Z
TX-DIFF-DC
DC Differential Tx Impedance (Gen1 only)
80
90
120
1, 10
Z
RX-DC
DC Common Mode Rx Impedance
40
45
60
1, 8, 9
Z
RX-DIFF-DC
DC Differential Rx Impedance (Gen1 only)
80
90
120
1
V
RX-DIFFp-p
Differential Rx input Peak to Peak Voltage
(Gen1 only)
(Gen1 only)
0.175
1.2
V
1
V
RX-DIFFp-p
Differential Rx input Peak to Peak Voltage
(Gen2 only)
(Gen2 only)
0.12
1.2
V
1
V
RX_CM-AC-p
Rx AC peak Common Mode Input Voltage
150
mV
1, 7
PEG_ICOMPO
Comp Resistance
24.75
25
25.25
4, 5
PEG_COMPI
Comp Resistance
24.75
25
25.25
4, 5
PEG_RCOMPO
Comp Resistance
24.75
25
25.25
4, 5