XIO2000AI TAOS [TEXAS ADVANCED OPTOELECTRONIC SOLUTIONS], XIO2000AI Datasheet - Page 146

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

Electrical Characteristics
PCI Express Differential Transmitter Output Ranges (continued)
NOTES: 6. No test load is necessarily associated with this value.
136
I TX-SHORT
TX short circuit current
limit
T TX-IDLE-MIN
Minimum time spent in
electrical idle
T TX-IDLE-SET-to-IDLE
Maximum time to
transition to a valid
electrical idle after
sending an electrical
idle ordered set
T TX-IDLE-to-DIFF-DATA
Maximum time to
transition to valid TX
specifications after
leaving an electrical idle
condition
RL TX-DIFF
Differential return loss
RL TX-CM
Common mode return
loss
Z TX-DIFF-DC
DC differential TX
impedance
Z TX-DC
Transmitter dc
impedance
C TX
AC coupling capacitor
PARAMETER
SCPS155C
10. Measured between 20% and 80% at transmitter package terminals into a test load for both V TXP and V TXN .
7. Specified at the measurement point into a timing and voltage compliance test load and measured over any 250 consecutive TX UIs.
8. A T TX-EYE = 0.75 UI provides for a total sum of deterministic and random jitter budget of T TX-JITTER-MAX = 0.25 UI for the transmitter
9. The transmitter input impedance results in a differential return loss greater than or equal to 12 dB and a common mode return loss
collected over any 250 consecutive TX UIs. The T TX-EYE-MEDIAN-to-MAX-JITTER specification ensures a jitter distribution in which the
median and the maximum deviation from the median is less than half of the total TX jitter budget collected over any 250 consecutive
TX UIs. It must be noted that the median is not the same as the mean. The jitter median describes the point in time where the number
of jitter points on either side is approximately equal as opposed to the averaged time value.
greater than or equal to 6 dB over a frequency range of 50 MHz to 1.25 GHz. This input impedance requirement applies to all valid
input levels. The reference impedance for return loss measurements is 50 Ω to ground for both the P and N line. Note that the series
capacitors C TX is optional for the return loss measurement.
TERMINALS
TXP, TXN
TXP, TXN
TXP, TXN
TXP, TXN
TXP, TXN
TXP, TXN
TXP, TXN
TXP, TXN
TXP, TXN
MIN
50
10
80
40
75
6
NOM
100
MAX
120
200
90
20
20
UNITS
mA
dB
dB
nF
UI
UI
UI
Ω
Ω
The total current the transmitter can provide when
shorted to its ground.
Minimum time a transmitter must be in electrical idle.
Utilized by the receiver to start looking for an electrical
idle exit after successfully receiving an electrical idle
ordered set.
After sending an electrical idle ordered set, the
transmitter must meet all electrical idle specifications
within this time. This is considered a debounce time for
the transmitter to meet electrical idle after transitioning
from L0.
Maximum time to meet all TX specifications when
transitioning from electrical idle to sending differential
data. This is considered a debounce time for the TX to
meet all TX specifications after leaving electrical idle.
Measured over 50 MHz to 1.25 GHz. See Note 9.
Measured over 50 MHz to 1.25 GHz. See Note 9.
TX dc differential mode low impedance
Required TXP as well as TXN dc impedance during all
states
All transmitters are ac-coupled and are required on the
PWB.
COMMENTS
April 2007 Revised October 2008