MPC8548E Freescale, MPC8548E Datasheet - Page 73

• Manufacturer Part Number: MPC8548E
• Description: Integrated Processor
• Manufacturer: Freescale

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Freescale Semiconductor
V
T
T
RX-IDLE-DET-DIFFp-p
Z
RX-EYE-MEDIAN-to-
RX-IDLE-DET-DIFF-
RX-HIGH-IMP-DC
Z
V
MAX-JITTER
ENTERTIME
RL
RL
RX-DIFF-DC
RX-CM-ACp
Symbol
T
Z
RX-EYE
RX-DIFF
RX-DC
RX-CM
MPC8548E PowerQUICC™ III Integrated Processor Hardware Specifications, Rev. 4
Table 52. Differential Receiver (RX) Input Specifications (continued)
jitter median and
input impedance
detect threshold
Common mode
integration time
common mode
Maximum time
Powered down
DC differential
deviation from
Electrical idle
electrical idle
input voltage
receiver eye
between the
Unexpected
enter detect
Parameter
the median
impedance
impedance
Differential
return loss
return loss
maximum
threshold
Minimum
DC input
DC input
AC peak
width
200 k
Min
0.4
15
80
40
65
—
—
—
6
Nom
100
—
—
—
—
—
50
—
—
—
Max
150
120
175
0.3
60
10
—
—
—
—
Unit
mV
mV
ms
dB
dB
UI
UI
Ω
Ω
Ω
The maximum interconnect media and transmitter
jitter that can be tolerated by the receiver can be
derived as T
See Notes 2 and 3.
Jitter is defined as the measurement variation of
the crossing points (V
to a recovered TX UI. A recovered TX UI is
calculated over 3500 consecutive unit intervals of
sample data. Jitter is measured using all edges of
the 250 consecutive UI in the center of the
3500 UI used for calculating the TX UI.
See Notes 2, 3, and 7.
V
V
See Note 2.
Measured over 50 MHz to 1.25 GHz with the D+
and D– lines biased at +300 mV and –300 mV,
respectively. See Note 4.
Measured over 50 MHz to 1.25 GHz with the D+
and D– lines biased at 0 V. See Note 4.
RX DC differential mode impedance. See Note 5.
Required RX D+ as well as D– DC impedance
(50 ± 20% tolerance). See Notes 2 and 5.
Required RX D+ as well as D– DC impedance
when the receiver terminations do not have
power. See Note 6.
V
Measured at the package pins of the receiver
An unexpected electrical idle (V
V
longer than T
an unexpected idle condition.
RX-CM-ACp
RX-CM-DC
RX-IDLE-DET-DIFFp-p
RX-IDLE-DET-DIFFp-p
= DC
= |V
RX-MAX-JITTER
RX-IDLE-DET-DIFF-ENTERING
RXD+
(avg)
Comments
) must be recognized no
= 2*|V
of |V
– V
RX-DIFFp-p
RXD-
RX-D+
= 1 – T
RX-D+
|/2 + V
RX-DIFFp-p
+ V
= 0 V) in relation
-V
RX-EYE
RX-D–
RX-D–
RX-CM-DC
PCI Express
to signal
|.
= 0.6 UI.
|/2.
<
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