Datasheet, Volume 1 73
Signal Description
6.11 Processor Power Signals
Note:
1. The VCCSA_VID can toggle at most once in 500 uS; The slew rate of VCCSA_VID is 1 V/nS.
6.12 Sense Signals

Table 6-13. Processor Power Signals

Signal Name Description Direction/
Buffer Type
VCC Processor core power rail. Ref
VCCIO Processor power for I/O. Ref
VDDQ Processor I/O supply voltage for DDR3. Ref
VCCAXG Graphics core power supply. Ref
VCCPLL VCCPLL provides isolated power for internal processor PLLs. Ref
VCCSA System Agent power supply. Ref
VIDSOUT
VIDSCLK
VIDALERT#
VIDALERT#, VIDSCLK, and VIDSCLK comprise a three signal
serial synchronous interface used to transfer power
management information between the processor and the
voltage regulator controllers. This serial VID interface replaces
the parallel VID interface on previous processors.
CMOS I/ OD O
OD O
CMOS I
VCCSA_VID 1 Voltage selection for VCCSA: O
CMOS

Table 6-14. Sense Signals

Signal Name Description Direction/
Buffer Type
VCC_SENSE
VSS_SENSE
VCC_SENSE and VSS_SENSE provide an isolated, low
impedance connection to the processor core voltage and
ground. They can be used to sense or measure voltage near the
silicon.
O
Analog
VAXG_SENSE
VSSAXG_SENSE
VAXG_SENSE and VSSAXG_SENSE provide an isolated, low
impedance connection to the VAXG voltage and ground. They
can be used to sense or measure voltage near the silicon.
O
Analog
VCCIO_SENSE
VSS_SENSE_VCCIO
VCCIO_SENSE and VSS_SENSE_VCCIO provide an isolated, low
impedance connection to the processor VCCIO voltage and
ground. They can be used to sense or measure voltage near the
silicon.
O
Analog
VCCSA_SENSE VCCSA_SENSE provide an isolated, low impedance connection
to the processor system agent voltage. It can be used to sense
or measure voltage near the silicon.
O
Analog