Data Sheet
Signal Description
114 Datasheet, Volume 1 of 2
6.12 Ground, Reserved and Non-Critical to Function
(NCTF) Signals
The following are the general types of reserved (RSVD) signals and connection
guidelines:
• RSVD – these signals should not be connected
• RSVD_TP – these signals should be routed to a test point
• RSVD_NCTF – these signals are non-critical to function and may be left
unconnected
Arbitrary connection of these signals to VCC, VDDQ, VSS, or to any other signal
(including each other) may result in component malfunction or incompatibility with
future processors. Refer Table 6-16. For reliable operation, always connect unused
inputs or bi-directional signals to an appropriate signal level. Unused active high inputs
should be connected through a resistor to ground (V
SS
). Unused outputs may be left
unconnected however, this may interfere with some Test Access Port (TAP) functions,
complicate debug probing and prevent boundary scan testing. A resistor should be used
when tying bi-directional signals to power or ground. When tying any signal to power or
ground, the resistor can also be used for system testability.
Vcc_SENSE
Isolated, low impedance voltage sense pins. They
can be used to sense or measure voltage near the
silicon.
N/A Power — All Processor Lines
Vcc
GT
_SENSE N/A Power — All Processor Lines
Vcc
IO
_SENSE N/A Power — All Processor Lines
Vcc
SA
_SENSE N/A Power — All Processor Lines
Vcc
OPC
_SENSE N/A Power —
Processors w/ On-
Package Cache
Vcc
EOPIO
_SENSE N/A Power —
Processors w/ On-
Package Cache
Table 6-15. Processor Ground Rails Signals
Signal Name Description Dir.
Buffer
Type
Link
Type
Availability
Vss_SENSE
Isolated, low impedance Ground sense pins. They
can be used for the reference ground near the
silicon.
N/A Ground — All Processor Lines
Vss
GT
_SENSE N/A Ground — All Processor Lines
Vss
IO
_SENSE N/A Ground — U/H Processor Lines
Vss
SA
_SENSE N/A Ground — U/H Processor Lines
Vss
SA
_Vss
IO
_SENSE N/A Ground — S Processor Lines
Vss
OPC
_SENSE N/A Ground —
Processors w/ On-
Package Cache
Vss
EOPIO
_SENSE N/A Ground —
Processors w/ On-
Package Cache
Note: Vss
SA
_Vss
IO
_SENSE is available only on S-Processor line and designated to have the GND reference for sense both
VCCSA and VCCIO power rails.
Table 6-14. Processor Power Rails Signals (Sheet 2 of 2)
Signal Name Description Dir.
Buffer
Type
Link
Type
Availability