Differential Receiver; Jitter; Total Jitter (Dj + Rj); Deterministic Jitter (Dj) - Xilinx RocketIO X User Manual

Differential Receiver

Differential Receiver
The differential receiver accepts the V
calculation V
All input data must be differential and nominally biased to a common mode voltage of
0.25 V – 2.5 V, or AC coupled. Internal terminations provide for simple 50Ω transmission
line connection.
The differential receiver parameters are shown in

Table 4-6: Differential Receiver Parameters

Jitter

Jitter is defined as the short-term variations of significant instants of a signal from their
ideal positions in time (ITU). Jitter is typically expressed in a decimal fraction of Unit
Interval (UI), e.g., 0.3 UI.

Total Jitter (DJ + RJ)

Deterministic Jitter (DJ)

DJ is data pattern dependant jitter, attributed to a unique source (e.g., Inter Symbol
Interference (ISI) due to loss effects of the media). DJ is linearly additive.

Random Jitter (RJ)

RJ is due to stochastic sources, such as substrate, power supply, etc. RJ is additive as the
sum of squares, and follows a bell curve.
RocketIO™ X Transceiver User Guide
UG035 (v1.5) November 22, 2004
- V electronically.
P N
Parameter
V Serial input differential peak
IN
to peak (RXP/RXN)
V Common mode input voltage
ICM
range
T
Differential input skew
ISKEW
T Receive data total jitter
JTOL
tolerance (peak to peak)
T Receive data deterministic
DJTOL
jitter tolerance (peak to peak)
Notes:
1. UI = Unit Interval = 1 bit period.
2. See DS083 for jitter tolerance values.
and V signals, carrying out the difference
P N
Table
Min
250
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4-6.
Typ Max Units Conditions
2000 mV
2500 mV
TBD ps
(1)
UI
(1)
UI
R
103