Intel X3460 BV80605001908AL User Manual

66

Datasheet, Volume 1

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 V

CC

, V

TT

, V

DDQ

, V

CCPLL

, V

SS

, or to any other 

signal (including each other) may result in component malfunction or incompatibility 
with future processors. See 

 for a land listing of the processor and the 

location of all reserved signals. 

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 must be used when tying bi-directional 
signals to power or ground. When tying any signal to power or ground, a resistor will 
also allow for system testability. For details, see 

Signals are grouped by buffer type and similar characteristics as listed in 

. The 

buffer type indicates which signaling technology and specifications apply to the signals. 
All the differential signals, and selected DDR3 and Control Sideband signals, have On-
Die Termination (ODT) resistors. There are some signals that do not have ODT and 
need to be terminated on the board.