XIO2000AI TAOS [TEXAS ADVANCED OPTOELECTRONIC SOLUTIONS], XIO2000AI Datasheet - Page 145

• Manufacturer Part Number: XIO2000AI
• Description: PCI Express to PCI Bus Translation Bridge
• Manufacturer: TAOS [TEXAS ADVANCED OPTOELECTRONIC SOLUTIONS]

7.4
April 2007 Revised October 2008
UI
Unit interval
V TX-DIFFp-p
Differential
peak-to-peak output
voltage
V TX-DE-RATIO
De-emphasized
differential output
voltage (ratio)
T TX-EYE
Minimum TX eye width
T TX-EYE-MEDIAN-to-MAX
-JITTER
Maximum time between
the jitter median and
maximum deviation
from the median
T TX-RISE ,
T TX-FALL
P/N TX output rise/fall
time
V TX-CM-ACp
RMS ac peak common
mode output voltage
V TX-CM-DC-ACTIVE-IDLE-
DELTA
Absolute delta of dc
common mode voltage
during L0 and electrical
idle
V TX-CM-DC-LINE-DELTA
Absolute delta of dc
common mode voltage
between P and N
V TX-IDLE-DIFFp
Electrical idle
differential peak output
voltage
V TX-RCV-DETECT
The amount of voltage
change allowed during
receiver detection
V TX-DC-CM
The TX dc common
mode voltage
PARAMETER
PCI Express Differential Transmitter Output Ranges
TERMINALS
TXP, TXN
TXP, TXN
TXP, TXN
TXP, TXN
TXP, TXN
TXP, TXN
TXP, TXN
TXP, TXN
TXP, TXN
TXP, TXN
TXP, TXN
TXP, TXN
399.88
MIN
0.125
−3.0
0.75
0.8
0
0
0
0
NOM
−3.5
400
400.12
MAX
−4.0
0.15
100
600
1.2
3.6
20
25
20
UNITS
mV
mV
mV
mV
mV
dB
ps
UI
UI
UI
V
V
Each UI is 400 ps ±300 ppm. UI does not account for
SSC dictated variations.
See Note 6.
V TX-DIFFp-p = 2*|V TXP − V TXN |
See Note 7.
This is the ratio of the V TX-DIFFp-p of the second and
following bits after a transition divided by the V TX-DIFFp-p
of the first bit after a transition.
See Note 7.
The maximum transmitter jitter can be derived as
T TXMAX- JITTER = 1 − T TX-EYE = 0.3 UI
See Notes 7 and 8.
Jitter is defined as the measurement variation of the
crossing points (V TX-DIFFp-p = 0 V) in relation to
recovered TX UI. A recovered TX UI is calculated over
3500 consecutive UIs of sample data. Jitter is measured
using all edges of the 250 consecutive UIs in the center
of the 3500 UIs used for calculating the TX UI.
See Notes 7 and 8.
See Notes 7 and 10.
V TX-CM-ACp = RMS(|V TXP + V TXN |/2 – V TX-CM-DC )
V TX-CM-DC = DC (avg) of |V TXP + V TXN |/2
See Note 7.
|V TX-CM-DC – V TX-CM-Idle-DC |  100 mV
V TX-CM-DC = DC (avg) of |V TXP + V TXN |/2 [during L0]
V TX-CM-Idle-DC = DC (avg) of |V TXP + V TXN |/2 [during
electrical idle]
See Note 7.
|V TXP-CM-DC – V TXN-CM-DC |  25 mV when
V TXP-CM-DC = DC (avg) of |V TXP |
V TXN-CM-DC = DC (avg) of |V TXN |
See Note 7.
V TX-IDLE-DIFFp = |V TXP-Idle − V TXN-Idle |  20 mV
See Note 7.
The total amount of voltage change that a transmitter
can apply to sense whether a low impedance receiver is
present.
The allowed dc common mode voltage under any
condition
COMMENTS
Electrical Characteristics
SCPS155C
135