Datasheet

Electrical Specifications
Intel
®
Xeon
®
Processor C5500/C3500 Series
Datasheet, Volume 1 January 2010
510 Order Number: 323103-001
13.6.4 PCI Express Signal DC Specifications
The following table defines the parameters for transmitters and receivers.
Table 167. PCI Express/DMI Interface -- 2.5 and 5.0 GT/s Transmitter DC Specifications
Symbol Parameter 2.5 GT/s 5.0 GT/s Units Comments
Z
TX-DIFF-DC
DC differential Tx
impedance
80 (min)
120 (max)
120 (max) Ohms
Low impedance defined during signaling.
Parameter is captured for 5.0 GHz by
RL
TX-DIFF
.
I
TX-SHORT
Transmitter short-
circuit current limit
90 (max) 90 (max) mA
The total current the Transmitter can
supply when shorted to ground.
V
TX-DC-CM
Transmitter DC
common-mode
voltage
0 (min)
3.6 (max)
0 (min)
3.6 (max)
V
The allowed DC common-mode voltage
at the Transmitter pins under any
conditions.
V
TX-CM-DC-ACTIVEIDLE-DELTA
Absolute Delta of
DC Common Mode
Voltage during L0
and Electrical Idle
0 (min)
100 (max)
0 (min)
100 (max)
mV
|VTX-CM-DC [during L0] – VTX-CM-Idle-
DC [during Electrical Idle]| <= 100 mV
VTX-CM-DC = DC(avg) of |VTX-D+ +
VTX-D-|/2 VTX-CM-Idle-DC= DC(avg) of
|VTX-D+ + VTX-D-|/2 [Electrical Idle]
V
TX-CM-DC-LINEDELTA
Absolute Delta of
DC Common Mode
Voltage between
D+ and D
0 (min)
25 (max)
0 (min)
25 (max)
mV
|V
TX-CM-DC-D+ [during L0] –
V
TX-CM-DC-D-
[during L0.]
| 25 mV V
TX-CM-DC-D+ =
DC(avg) of |VTX-D+| [during L0] VTX-
CM-DC-D- = DC(avg) of |VTX-D-|
[during L0]
V
TX-IDLE-DIFF-DC
DC Electrical Idle
Differential Output
Voltage
Not
specified
0 (min)
5 (max)
mV
VTX-IDLE-DIFF-DC = |VTX-Idle-D+ -
VTx-Idle-D-| 5 mV. Voltage must be low
pass filtered to remove any AC
component. Filter characteristics
complementary to above.