Altera Early SSN Estimator - Manual (Page 7)

Chapter 1: Early SSN Estimator 1–3
Setting up the Early SSN Estimator
© November 2009 Altera Corporation Early SSN Estimator User Guide for Altera Programmable Devices
Equation 1–1. Victim Net Driven Low
V
IL margin (K)
=
V
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)
V
IL Max (DC)
= Receiver Maximum DC Input Low Voltage
Equation 1–2. Victim Net Driven High
V
IH margin (K)
=
V
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)
V
IH Min (DC)
= Receiver Minimum DC Input High Voltage
{1
QLN
K ( )
QL –
( )
VIL
M ax DC ( )
QL –
( )
-------------------------------------------------- } *100 where –
{1
Q H Q HN – K ( )
( )
Q H VIH –
Min DC ( )
( )
-------------------------------------------------- } *100 where –