Altera Early SSN Estimator User Manual download pdf (Page 7)

Chapter 1: Early SSN Estimator 1–3

Setting up the Early SSN Estimator

Equation 1–1. Victim Net Driven Low

IL margin

(K)

IL margin (K)

= Signal Margin Low when K aggressors are switching simultaneously

K = Number of I/Os switching simultaneously

QLN

(K)

= Quiet Low Noise when K aggressors are switching simultaneously

QL = Quiet Low Voltage (No aggressors switching)

IL Max (DC)

= Receiver Maximum DC Input Low Voltage

Equation 1–2. Victim Net Driven High

IH margin

(K)

IH margin (K)

= Signal Margin High when K aggressors are switching simultaneously

K = Number of I/Os switching simultaneously

QHN

(K)

= Quiet High Noise when K aggressors are switching simultaneously

QH = Quiet High Voltage (No aggressors switching)

IH Min (DC)

= Receiver Minimum DC Input High Voltage

QLN

K()

QL–()

VIL

Max DC()

QL–()

------------------------------------------------- -

} *100 where–

QH QHN–

K()

()

QH VIH–

Min DC()

()

--------------------------------------------------

} *100 where–

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Altera Early SSN Estimator User Manual Page 7