PCI Express® Interfaces
© 2008 Advanced Micro Devices, Inc.
41978 AMD RS690M Databook 3.06
Proprietary
3-9
3.5
PCI Express
®
Interfaces
3.5.1
1 x 16 Lane Interface for External Graphics (Not Applicable to the RS690MC)
3.5.2
A-Link Express II to Southbridge
3.5.3
4 x 1 Lane Interface for General Purpose External Devices
3.5.4
Miscellaneous PCI Express
®
Signals
Table 3-3 1 x 16 Lane PCI Express Interface for External Graphics
Pin Name
Type
Power
Domain
Ground
Domain
Integrated
Termination
Functional Description
GFX_TX[15:0]P,
GFX_TX[15:0]N
O
VDD_PCIE VSS_PCIE
50
Ω
between
complements
Transmit Data Differential Pairs. Connect to external connector for
an external graphics card on the motherboard (if implemented).
GFX_RX[15:0]P,
GFX_RX[15:0]N
I
VDD_PCIE VSS_PCIE
50
Ω
between
complements
Receive Data Differential Pairs. Connect to external connector for an
external graphics card on the motherboard (if implemented).
GFX_REFCLKP,
GFX_REFCLKN
I
VDD_PCIE VSS_PCIE
50
Ω
between
complements
Clock Differential Pairs. Connect to external clock generator when
an external graphics card is implemented.
*Note:
The RS690T supports an external graphics card through an 8-lane interface, thus GFX_TX[15:8]P/N and GFX_RX[15:8]P/N do not
exist on the RS690T
Table 3-4 1 x 4 Lane A-Link Express II Interface for Southbridge
Pin Name
Type
Power
Domain
Ground
Domain
Integrated
Termination
Functional Description
SB_TX[3:0]P,
SB_TX[3:0]N
O
VDD_PCIE VSS_PCIE
50
Ω
between
complements
Transmit Data Differential Pairs. Connect to the corresponding
Receive Data Differential pairs on the Southbridge.
SB_RX[3:0]P,
SB_RX[3:0]N
I
VDD_PCIE VSS_PCIE
50
Ω
between
complements
Receive Data Differential Pairs. Connect to the corresponding
Transmit Data Differential pairs on the Southbridge.
SB_CLKP,
SB_CLKN
I
VDD_PCIE VSS_PCIE
50
Ω
between
complements
Clock Differential Pair. Connect to an external clock generator on
the motherboard.
Table 3-5 4 x 1 Lane PCI Express
®
Interface for General Purpose External Devices
Pin Name
Type
Power
Domain
Ground
Domain
Integrated
Termination
Functional Description
GPP_TX[3:0]P,
GPP_TX[3:0]N
O
VDD_PCIE VSS_PCIE
50
Ω
between
complements
Transmit Data Differential Pairs. Connect to external connectors on
the motherboard for add-in card or ExpressCard support.
GPP_RX[3:0]P,
GPP_RX[3:0]N
I
VDD_PCIE VSS_PCIE
50
Ω
between
complements
Receive Data Differential Pairs. Connect to external connectors on
the motherboard for add-in card or ExpressCard support.
Table 3-6 PCI Express
®
Interface for Miscellaneous PCI Express
®
Signals
Pin Name
Type
Power
Domain
Ground
Domain
Functional Description
PCE_CALRN
Other
VDD_PCIE VSS_PCIE
RX Impedance Calibration. Connect to VDD_PCIE on the motherboard with an
external resistor of an appropriate value.
PCE_CALRP
Other
VDD_PCIE VSS_PCIE
TX Impedance Calibration. Connect to GND on the motherboard with an external
resistor of an appropriate value.