301467-005 Datasheet, PDF (41/426 Pages) Intel Corporation – Express Chipset

Signal Description
R
2.5
PCI Express* x16 Graphics Port Signals (Intel^®
82915G, 82915P, 82915PL Only)
Unless otherwise specified, PCI Express Graphics signals are AC coupled, so the only voltage
specified is a maximum 1.2 V differential swing.
Signal Name
EXP_RXN[15:0]
EXP_RXP[15:0]
EXP_TXN[15:0]
EXP_TXP[15:0]
EXP_COMPO
EXP_COMPI
EXP_SLR
Type
I/O
PCIE
Description
PCI Express Graphics Receive Differential Pair
O
PCIE
PCI Express Graphics Transmit Differential Pair
I
A
I
A
I
CMOS
PCI Express Graphics Output Current Compensation
Note: EXP_COMP0 is used for DMI current compensation.
PCI Express Graphics Input Current Compensation
Note: EXP_COMPI is used for DMI current compensation.
PCI Express* Static Lane Reversal: The (G)MCH’s PCI Express lane
numbers are reversed. For example, the (G)MCH PCI Express interface
signals can be configured as follows:
Normal
Lane
Ball
Operation
Reversed
C10
EXP_TXP0
EXP_TXP15
A9
EXP_TXP1
EXP_TXP14
…
…
…
N3
EXP_TXP14… EXP_TXP1…
P1
EXP_TXP15
EXP_TXP0
0 = (G)MCH’s PCI Express lane numbers are reversed
1 = Normal operation
Datasheet
41