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Chapter 3 Hardware
XTX 820 Reference Manual 29
PCI Express Interface (J2)
The J2 connector has 100 pins and is used for PCI Express, Serial ATA (SATA), USB, ExpressCard,
AC'97/HDA (High Definition Audio), and LPC bus.
PCI Express/ExpressCards
The I/O Hub (82801FBM) provides four x1 PCI Express lanes which can be configured to support
PCI Express edge cards or two ExpressCards. If ExpressCards are used, one dedicated USB port
and one dedicated PCI Express lane are required for each ExpressCard and SMBus is optional.
Table 3-9. PCI Express Interface Pin/Signal Descriptions (J2)
J2
Pin #
Signal Description
69 PCIE0_RX- PCI Express Lane 0, Receive Input, Negative Differential Line
71 PCIE0_RX+ PCI Express Lane 0, Receive Input, Positive Differential Line
75 PCIE0_TX- PCI Express Lane 0, Transmit Output, Negative Differential Line
77 PCIE0_TX+ PCI Express Lane 0, Transmit Output, Positive Differential Line
53 PCIE1_RX- PCI Express Lane 1, Receive Input, Negative Differential Line
55 PCIE1_RX+ PCI Express Lane 1, Receive Input, Positive Differential Line
59 PCIE1_TX- PCI Express Lane 1, Transmit Output, Negative Differential Line
61 PCIE1_TX+ PCI Express Lane 1, Transmit Output, Positive Differential Line
39 PCIE2_RX- PCI Express Lane 2, Receive Input, Negative Differential Line
37 PCIE2_RX+ PCI Express Lane 2, Receive Input, Positive Differential Line
33 PCIE2_TX- PCI Express Lane 2, Transmit Output, Negative Differential Line
31 PCIE2_TX+ PCI Express Lane 2, Transmit Output, Positive Differential Line
17 PCIE3_RX- PCI Express Lane 3, Receive Input, Negative Differential Line
15 PCIE3_RX+ PCI Express Lane 3, Receive Input, Positive Differential Line
11 PCIE3_TX- PCI Express Lane 3, Transmit Output, Negative Differential Line
9 PCIE3_TX+ PCI Express Lane 3, Transmit Output, Positive Differential Line
5 PCIE_CLK_REF- PCI Express Reference Clock, Negative Differential Line
3 PCIE_CLK_REF+ PCI Express Reference Clock, Positive Differential Line
41 EXC0_CPPE* ExpressCard (capable card) Request (for slot 1)
43 EXC0_RST* ExpressCard Reset Slot 1
21 EXC1_CPPE* ExpressCard (capable card) Request (for slot 2)
23 EXC1_RST* ExpressCard Reset (for slot 2)
63 PCE_WAKE* PCI Express Wake Event
Notes: The shaded area denotes power or ground. The signals marked with * = Negative true logic.