CAB4A

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SNAS630B – JULY 2013 – REVISED OCTOBER 2013

Table 1. TERMINAL FUNCTIONS (continued)

SIGNAL

TYPE

DESCRIPTION

GROUP

NAME

VREFCA

VCC/2Reference voltage

Input reference voltage for the CMOS inputs.

VDD

Power input

Power supply voltage

VSS

Ground input

Ground

AVDD

Analog power

Analog supply voltage

Miscellaneous pins

PVDD

Clock power

Clock logic and clock output driver power supply.

PVSS

Clock ground

Clock logic and clock output driver ground.

ZQCAL

Reference

Needs a calibration resistor of 240

Ω ±1% to VSS.

NU

Mechanical ball

Do not connect on PCB.

RFU[3:0]

I/O

Reserved; must be left floating on DIMM and in DDR4 register.

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