Power Management Pins; Miscellaneous Pins; Table 3-7 Power Management Pins; Table 3-8 Miscellaneous Pins - AMD RX881 Data Book

Power Management Pins

3.6 Power Management Pins

Table 3-7 Power Management Pins

Pin Name
LDTSTOP#
ALLOW_LDTSTOP
SYSRESET#
POWERGOOD
3.7

Miscellaneous Pins

Table 3-8 Miscellaneous Pins

Pin Name
DAC_HSYNC
DAC_VSYNC
GPIO[4:2]
MEM_VREF
NC
STRP_DATA
SUS_STAT#
TESTMODE
© 2011 Advanced Micro Devices, Inc.
Proprietary
Power Ground
Type
Domain Domain
I VDD33 VSS
OD VDD33 VSS
I VDD33 VSS
I VDD18 VSS
Power Ground
Type
Domain Domain
Other VDD33 VSS
Other VDD33 VSS
I/O VDDR3 VSS
Other – VSS
– – –
I/O VDD33 VSS
Other VDD33 VSS
I VDD33 VSS
Functional Description
HyperTransport™ Stop. Used for systems requiring power management. It is a
single-ended signal for input from the Southbridge to enable and disable the
HyperTransport link during system state transitions.
Note: For platforms supporting DDR2 system memory, 1.8V signalling can be
used on the signal. For platforms supporting DDR3 system memory, follow
recommendations in the RS880-Series IGP Motherboard Schematic Review
Checklist.
Allow LDTSTOP. The signal is used for controlling LDTSTOP assertions. It is an
output to the SB.
1 = LDTSTOP# can be asserted
0 = LDTSTOP# has to be de-asserted
Note: For platforms supporting DDR2 system memory, 1.8V signalling can be
used on the signal. For platforms supporting DDR3 system memory, follow
recommendations in the RS880-Series IGP Motherboard Schematic Review
Checklist.
Global Hardware Reset. This signal comes from the Southbridge.
Input from the motherboard signifying that the power to the RX881 is up and ready.
Signal High means all power planes are valid. It is not observed internally until it
has been high for more than six consecutive REFCLK cycles. The rising edge of
this signal is deglitched.
Integrated
Termination Functional Description
50k This is a strap pin for a reserved strap function. See
"Strap Definitions for the RX881,"
programmable:
PU/PD/none
50k This is a strap pin for the STRAP_DEBUG_BUS_GPIO _ENABLE#
programmable: strap function. See
RX881,"
PU/PD/none for details.
50k General Purpose I/O. These pins can also be used as outputs to
programmable: the voltage regulator for pulse-width modulation of various voltages
PU/PD/none on the motherboard.
None Connect the pin to ground
– No connect. These pins should be left unconnected to anything.
2
50k I C interface data signal for external EEPROM based strap loading.
programmable: Can also be used as GPIO, or as output to the voltage regulator for
PU/PD/none pulse-width modulation of RX881's core voltage.
50k This is a strap pin for the LOAD_EEPROM_STRAPS# strap
Table 3-11, "Strap Definitions for the
programmable: function. See
RX881,"
PU/PD/none for details.
When High, puts the RX881 in test mode and disables the RX881
–
from operating normally.
for details.
Table 3-11, "Strap Definitions for the
46136 AMD RX881 Databook 1.40
Table 3-11,
3-7