Pcie Dc Specifications - Intel 2ND GENERATION CORE PROCESSOR FAMILY DESKTOP - DATASHEET VOLUME 1 01-2011 Datasheet

Electrical Specifications
Table 7-10. PCIe DC Specifications
Symbol
V
TX-DIFF-p-p Low
V
TX-DIFF-p-p
V
TX_CM-AC-p
V
TX_CM-AC-p-p
Z
TX-DIFF-DC
Z
RX-DC
Z
RX-DIFF-DC
V
RX-DIFFp-p
V
RX-DIFFp-p
V
RX_CM-AC-p
PEG_ICOMPO
PEG_COMPI
PEG_RCOMPO
Notes:
1. Refer to the PCI Express Base Specification for more details.
2. V
TX-AC-CM-PP
at least 10^
3. As measured with compliance test load. Defined as 2*|V
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|}.
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  ±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.
Datasheet, Volume 1
Parameter
Low differential peak to peak Tx voltage
swing
Differential peak to peak Tx voltage swing
Tx AC Peak Common Mode Output
Voltage (Gen1 only)
Tx AC Peak Common Mode Output
Voltage (Gen2 only)
DC Differential Tx Impedance (Gen1 only)
DC Common Mode Rx Impedance
DC Differential Rx Impedance (Gen1 only)
Differential Rx input Peak to Peak Voltage
(Gen1 only)
Differential Rx input Peak to Peak Voltage
(Gen2 only)
Rx AC peak Common Mode Input Voltage
Comp Resistance
Comp Resistance
Comp Resistance
and V are defined in the PCI Express Base Specification. Measurement is made over
TX-AC-CM-P
6
UI.
Min Typ Max Units
0.4 0.5 0.6
0.8 1 1.2
— — 20
— — 100
80 90 120
40 45 60
80 90 120
0.175 — 1.2
0.12 — 1.2
150 — —
24.75 25 25.25
24.75 25 25.25
24.75 25 25.25
– V |.
TXD+ TXD-
1,11
Notes
V 3
V 3
mV 1, 2, 6
mV 1,2
 1, 10
 1,8,9
 1
V 1
V 1
mV 1, 7
 4, 5
 4, 5
 4, 5
83