Theory of Operation
Developer’s Kit User Manual 21
R
V
P
2
=
R = value of the sense resistor (typically 0.002 Ω)
V = the voltage difference measured across the sense resistor.
It is recommended to use a high precision digital multi-meter tool such as the Agilent
34401A* digital multi-meter.
3.5 Intel
®
Atom™ Processor N270
The CRB design supports the Intel
®
Atom
TM
N270 at 1.6 GHz with 512 KB L2 cache in
a 437-pin FCBGA8 package.
3.5.1 Processor Voltage Regulators
The CRB implements an on-board Intel
®
MVP-6 regulator for the processor core
supply in a single phase.
3.5.2 FSB
The front side bus (FSB) on the CRB supports 533 MT/s (133 MHz quad-pumped). The
FSB is AGTL+ and runs at 1.05 V.
3.5.3 Power Management
The Intel
®
Atom
TM
Processor N270 supports C0-C4 power states along with C1E, C2E,
and C4E. DPWR# protocol is also supported on the CRB.
3.5.4 Debug Interfaces
An XDP (Extended Debug Port) connector is provided at J1 for processor run control
debug support. This connector is compatible with both XDP and ITP-700. An external
adapter is used to interface ITPFlex700 cable to the platform.
Note: The XDP interface is backward-compatible with the ITP interface. However, an XDP to
ITP converter cable is necessary to use the older ITP tools. Also, in some cases a
resistor change rework is necessary to get the older ITP tools to function properly.
Please contact local Intel field representative for additional details.
3.5.5 Testability
The CRB provides an Extended Debug Port (XDP) for testing at J1 and direct processor
probing. The XDP interface is backwards-compatible with the older ITP interface as
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