Differential Receiver; Jitter - Xilinx RocketIO User Manual

Differential Receiver

Differential Receiver
The differential receiver accepts the V
All input data must be differential and nominally biased to a common mode voltage of 0.5 V –
connection. See
The differential receiver parameters are shown in
Table 3-3: 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 = Deterministic Jitter (DJ) + Random Jitter (RJ).
RocketIO™ Transceiver User Guide
UG024 (v2.3.2) June 24, 2004
V electronically.
N
2.5 V, or AC coupled. Internal terminations provide for simple 50Ω or 75Ω transmission line
Figure 3-6.
Parameter
Serial input differential peak to
V
IN
peak (RXP/RXN)
Common mode input voltage
V
ICM
range
T Differential input skew
ISKEW
Receive data total jitter tolerance
T
JTOL
(peak to peak)
Receive data deterministic jitter
T
DJTOL
tolerance (peak to peak)
Notes:
1. UI = Unit Interval
and V signals, carrying out the difference calculation V
P N
AVCCAUXRX
RXP Pullup
Pin Network
50 or 75
VTRX
50 or 75
RXN
Pin
GNDA
Figure 3-6: MGT Receiver
Table
Min
175
500
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PMA
RXP
PMA
RXN
UG024_47_012904
3-3.
Typ Max Units
2000 mV
2500 mV
75 ps
(1)
0.65 UI
0.41 UI
R
–
P
Conditions
105