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Electrical Specifications
Table 7-46.PCI Express DC Specifications
Alpha
Symbol
Group
V
(ad)
TX-DIFF-p-p
V
(ad)
TX_CM-AC-p
Z
(ad)
TX-DIFF-DC
Z
(ac)
RX-DC
Z
(ac)
RX-DIFF-DC
V
(ac)
RX-DIFFp-p
V
(ac)
RX_CM-AC-p
PEG_ICOMPO
(ae)
PEG_ICOMPI
(ae)
PEG_RCOMPO
(ae)
PEG_RBIAS
(ae)
NOTES:
1.
Refer to the PCI Express Base Specification for more details.
2.
V
and V
TX-AC-CM-PP
6
at least 10^
UI.
3.
As measured with compliance test load. Defined as 2*|V
4.
COMP resistance must be provided on the system board with 1% resistors. COMP resistors are to V
5.
PEG_ICOMPO, PEG_ICOMPI, PEG_RCOMPO are the same resistor
6.
RMS value.
7.
Measured at Rx pins into a pair of 50-Ω terminations into ground. Common mode peak voltage is defined
by the expression: max{|(Vd+ - Vd-) - V-CMDC|}.
8.
DC impedance limits are needed to guarantee 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 Ω ±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.
Datasheet
Parameter
Differential Peak-to-Peak Tx Voltage
Swing
Tx AC Peak Common Mode Output
Voltage (Gen 1 Only)
DC Differential Tx Impedance
(Gen 1 Only)
DC Common Mode Rx Impedance
DC Differential Rx Impedance
(Gen1 Only)
Differential Rx Input Peak-to-Peak
Voltage (Gen 1 only)
Rx AC Peak Common Mode Input
Voltage
Comp Resistance
Comp Resistance
Comp Resistance
Comp Resistance
are defined in the PCI Express Base Specification. Measurement is made over
TX-AC-CM-P
Min
Typ
Max
0.8
1.2
20
80
120
40
60
80
120
0.175
1.2
150
49.5
50
50.5
49.5
50
50.5
49.5
50
50.5
742.5
750
757.5
- V
|.
TXD+
TXD-
1
Units
Notes
V
3
mV
1,2,6
Ω
1,10
Ω
1,8,9
Ω
1
V
1,11
mV
1,7
Ω
4,5
Ω
4,5
Ω
4,5
Ω
4,5
.
SS
101
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