45732 AMD 780E Databook 3.10
© 2009 Advanced Micro Devices, Inc.
3-12
Proprietary
Miscellaneous Pins
3.12
Miscellaneous Pins
3.13
Power Pins
Table 3-14 Miscellaneous Pins
Pin Name
Type
Power
Domain
Ground
Domain
Integrated
Termination Functional Description
AUX_CAL
I
VDD33
VSS
50k
programmable:
PU/PD/non
Calibration for auxiliary pads.
DDC_CLK0/AUX0P
I/O
VDD33
VSS
50k
programmable:
PU/PD/none
DDC Clock 0 for displays, or AUX0P of the auxiliary pair for the
DisplayPort™ connected onto lane 0 to 3 of the PCI-E external
graphics interface. Can also be used as a GPIO.
DDC_DATA0/AUX0N
I/O
VDD33
VSS
50k
programmable:
PU/PD/none
DDC Data Channel 0 for displays, or AUX0N of the auxiliary pair for
the DisplayPort connected onto lane 0 to 3 on the PCI-E external
graphics interface. Can also be used as a GPIO.
DDC_CLK1/AUX1P
I/O
VDD33
VSS
50k
programmable:
PU/PD/none
DDC Clock 1 for displays, or AUX1P of the auxiliary pair for the
DisplayPort connected onto lane 4 to 7 of the PCI-E external
graphics interface. Can also be used as a GPIO.
DDC_DATA1/AUX1N
I/O
VDD33
VSS
50k
programmable:
PU/PD/none
DDC Data Channel 1 for displays, or AUX1N of the auxiliary pair for
the DisplayPort connected onto lane 4 to 7 on the PCI-E external
graphics interface. Can also be used as a GPIO.
HPD
I
VDD33
VSS
50k
programmable:
PU/PD/none
Hot plug detect for DisplayPort. Can also be used as GPIO.
I2C_CLK
I/O
VDD33
VSS
50k
programmable:
PU/PD/none
I
2
C™ interface clock signal.It can also be used as GPIO. The signal
is 5V-tolerant.
I2C_DATA
I/O
VDD33
VSS
50k
programmable:
PU/PD/none
I
2
C interface data signal. It can also be used as GPIO. The signal
is 5V-tolerant.
NC
–
–
–
–
No connect. These pins should be left unconnected to anything.
STRP_DATA
I/O
VDD33
VSS
50k
programmable:
PU/PD/none
I
2
C interface data signal for external EEPROM based strap loading.
Can also be used as GPIO, or as output to the voltage regulator for
pulse-width modulation of RS780E’s core voltage.
TESTMODE
I
VDD33
VSS
–
When High, puts the RS780E in test mode and disables the
RS780E from operating normally.
THERMALDIODE_P,
THERMALDIODE_N
A-O
–
–
–
Diode connections to external SMBus microcontroller for
monitoring IC thermal characteristics.
TMDS_HPD
I/O
VDD33
VSS
50k
programmable:
PU/PD/none
TMDS Hot Plug Detect. It monitors the hot-plug line for panel
detection. It is a 3.3V CMOS compatible input. When not used for
hot plug detection, it can also be used as output to the voltage
regulator for pulse-width modulation of various voltages on the
motherboard.
VDDLT33
Other
–
–
–
These balls are only for maintaining pin-compatibility with the
RS740-series IGPs AMD chipsets. They can either be connected to
a 3.3V rail or left unconnected on RS780E systems.
Table 3-15 Power Pins
Pin Name
Voltage
Pin
Count Ball Reference
Pin Description
AVDD
3.3V
2
E12, F12
Dedicated power for the DAC. Effort should be made at the board
level to provide as clean a power as possible to this pin to avoid
noise injection, which can affect display quality. Adequate
decoupling should be provided between this pin and AVSS.
AVDDDI
1.8V
1
F14
Dedicated digital power for the DAC