Specification Sheet

Signal Description
108 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 un-
connected
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. See Tabl e 6- 14 .
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.
6.13 Processor Internal Pull-Up / Pull-Down
Terminations
§ §
Table 6-14. GND, RSVD, and NCTF Signals
Signal Name Description
Vss Processor ground node
Vss_NCTF Non-Critical To Function: These signals are for package
mechanical reliability.
RSVD
RSVD_NCTF
RSVD_TP
Reserved: All signals that are RSVD and RSVD_NCTF should be
left unconnected on the board.
Intel recommends that all RSVD_TP signals have via test points.
Table 6-15. Processor Internal Pull-Up / Pull-Down Terminations
Signal Name Pull Up/Pull Down Rail Value
BPM[3:0] Pull Up / Pull Down Vcc
IO
16-60 ohms
PREQ# Pull Up Vcc
ST
3 kohms
PROC_TDI Pull Up Vcc
STG
1
3 kohms
PROC_TMS Pull Up Vcc
STG
1
3 kohms
PROC_TRSN# Pull Down - 3 kohms
CFG[19:0] Pull Up Vcc
IO
3 kohms
Note:
1. For S-Processor Line, it should be Vcc
ST