Intel D2500 DF8064101055400 Data Sheet

Product codes
DF8064101055400
Page of 122
Datasheet - Volume 1 of 2
57
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 maybe 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. Resistor values should be within ±20% of the 
impedance of the baseboard trace, unless otherwise noted in the appropriate platform 
design guidelines.
4.7
Signal Groups
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.
All Control Sideband Asynchronous signals are required to be asserted/deasserted for 
at least eight BCLKs in order for the processor to recognize the proper signal state. 
Refer to 
 for the DC and AC specifications.
4.8
Test Access Port (TAP) Connection
Due to the voltage levels supported by other components in the Test Access Port (TAP) 
logic, Intel recommends the processor be first in the TAP chain, followed by any other 
components within the system. A translation buffer should be used to connect to the 
rest of the chain unless one of the other components is capable of accepting an input of 
the appropriate voltage. Two copies of each signal may be required with each driving a 
different voltage level. 
4.9
DC Specifications
 list the DC specifications for the processor and are valid only while meeting 
the thermal specifications (as specified in the Thermal / Mechanical Specifications and 
Guidelines), clock frequency, and input voltages. 
 lists the DC specifications 
for the processor and are valid only while meeting specifications for junction 
temperature, clock frequency, and input voltages. Care should be taken to read all 
notes associated with each parameter. 
4.9.1
Flexible Motherboard Guidelines (FMB)
This is not applicable for D2000 series and N2000 series Next Generation Intel® 
Atom™ Processor based desktop platform.