
45732 AMD 780E Databook 3.10
© 2009 Advanced Micro Devices, Inc.
3-6
Proprietary
PCI Express® Interfaces
3.5
PCI Express
®
Interfaces
3.5.1
1 x 16 or 2 x 8 Lane Interface for External Graphics
3.5.2
A-Link Express II Interface for Southbridge
Note:
The widths of the A-Link Express II interface and the general purpose links for external devices are configured
through the programmable strap GPPSB_LINK_CONFIG, which is programmed through RS780E’s registers. See the
RS780 ASIC Family Register Reference Guide
, order# 43451, and the
RS780 ASIC Family Register Programming
Requirements,
order# 43291, for details.
3.5.3
6 x 1 Lane Interface for General Purpose External Devices
Note:
The widths of the A-Link Express II interface and the general purpose links for external devices are configured
through the programmable strap GPPSB_LINK_CONFIG, which is programmed through RS780E’s registers. See the
RS780 ASIC Family Register Reference Guide
, order# 43451, and the
RS780 ASIC Family Register Programming
Requirements,
order# 43291, for details.
3.5.4
Miscellaneous PCI Express
®
Signals
Table 3-3 1 x 16 or 2 x 8 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
VDDPCIE VSSAPCIE
50
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
VDDPCIE VSSAPCIE
50
between
complements
Receive Data Differential Pairs. Connect to external connector for an
external graphics card on the motherboard (if implemented).
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
VDDPCIE VSSAPCIE
50
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
VDDPCIE VSSAPCIE
50
between
complements
Receive Data Differential Pairs. Connect to the corresponding
Transmit Data Differential pairs on the Southbridge.
Table 3-5 6 x 1 Lane PCI Express
®
Interface for General Purpose External Devices
Pin Name
Type
Power
Domain
Ground
Domain
Integrated
Termination Functional Description
GPP_TX[5:0]P,
GPP_TX[5:0]N
O
VDDPCIE VSSAPCIE
50
between
complements
Transmit Data Differential Pairs. Connect to external connectors on
the motherboard for add-in card or ExpressCard support.
GPP_RX[5:0]P,
GPP_RX[5:0]N
I
VDDPCIE VSSAPCIE
50
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
VDDPCIE VSSAPCIE
RX Impedance Calibration. Connect to VDDPCIE on the motherboard with an
external resistor of an appropriate value.
PCE_CALRP
Other
VDDPCIE VSSAPCIE
TX Impedance Calibration. Connect to GND on the motherboard with an external
resistor of an appropriate value.