Intel Xeon 7130N LF80550KF0878M Data Sheet

65

§

V

CCA

I

V

CCA

 provides isolated power for the analog portion of the internal PLL’s. Use a discrete RLC filter to 

provide clean power. Refer to the appropriate platform design guide for complete implementation 
details.

V

CCIOPLL

I

V

CCIOPLL

 provides isolated power for digital portion of the internal PLL’s. Follow the guidelines for 

V

CCA

, and refer to the appropriate platform design guide for complete implementation details.

V

CCSENSE

V

SSSENSE

O

V

CCSENSE

 and V

SSSENSE

 provide isolated, low impedance connections to the processor core voltage 

(V

CC

) and ground (V

SS

). They can be used to sense or measure voltage or ground near the silicon 

with little noise.

VID[5:0]

O

VID[5:0] (Voltage ID) pins are used to support automatic selection of power supply voltages (V

CC

). 

These are open drain signals that are driven by the processor and must be pulled through a resistor. 
Conversely, the VR output must be disabled prior to the voltage supply for these pins becoming 
invalid. The VID pins are needed to support processor voltage specification variations. See 

for definitions of these pins. The V

CC

 VR must supply the voltage that is requested by these pins, or 

disable itself.

VIDPWRGD

I

The processor requires this input to determine that the supply voltage for BSEL[1:0] and VID[5:0] is 
stable and within specification.

V

SS

I

V

SS

 is the ground plane for the Dual-Core Intel Xeon processor 7000 series.

V

SSA

I

V

SSA

 provides an isolated, internal ground for internal PLL’s. Do not connect directly to ground. This 

pin is to be connected to V

CCA

 and V

CCIOPLL

 through a discrete filter circuit.

V

TT

I

V

TT

 is the FSB termination voltage.

VTTEN

O

VTTEN can be used as an output enable for the V

TT

 regulator. VTTEN is used as an electrical key to 

prevent processors with mechanically-equivalent pinouts from accidentally booting in a Dual-Core 
Intel Xeon processor 7000 series platform. Since VTTEN is an open circuit on the processor 
package, VTTEN must be pulled up on the motherboard. Refer to the appropriate platform design 
guide for implementation details.