mpc8641 Freescale Semiconductor, Inc, mpc8641 Datasheet - Page 74

• Manufacturer Part Number: mpc8641
• Description: Integrated Host Processor Hardware Specifications
• Manufacturer: Freescale Semiconductor, Inc

UI
V
T
T
-JITTER
V
RL
RL
Z
Z
Z
V
PCI Express
14.4.3
Table 50
specified at the component pins.
74
RX-EYE
RX-EYE-MEDIAN-to-MAX
RX-DIFF-DC
RX-DC
RX-HIGH-IMP-DC
RX-DIFFp-p
RX-CM-ACp
RX-IDLE-DET-DIFFp-p
RX-DIFF
RX-CM
Symbol
defines the specifications for the differential input at all receivers (RXs). The parameters are
Differential Receiver (RX) Input Specifications
MPC8641 and MPC8641D Integrated Host Processor Hardware Specifications, Rev. 2
Unit Interval
Differential
Peak-to-Peak
Output Voltage
Minimum
Receiver Eye
Width
Maximum time
between the jitter
median and
maximum
deviation from
the median.
AC Peak
Common Mode
Input Voltage
Differential
Return Loss
Common Mode
Return Loss
DC Differential
Input Impedance
DC Input
Impedance
Powered Down
DC Input
Impedance
Electrical Idle
Detect Threshold
Parameter
Table 50. Differential Receiver (RX) Input Specifications
399.88
0.175
200 k
Min
0.4
—
—
15
80
40
65
6
Nom
400
100
50
—
—
—
—
—
—
—
—
400.12
Max
150
120
0.3
60
—
—
—
—
—
—
Units
mV
mV
dB
dB
ps
UI
UI
Ω
Ω
Ω
V
Each UI is 400 ps ± 300 ppm. UI does not
account for Spread Spectrum Clock dictated
variations. See Note 1.
V
See Note 2.
The maximum interconnect media and
Transmitter jitter that can be tolerated by the
Receiver can be derived as T
1 – T
See Notes 2 and 3.
Jitter is defined as the measurement variation
of the crossing points (V
relation 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
RX-DIFFp-p
RX-CM-ACp
RX-CM-DC
RX-IDLE-DET-DIFFp-p
RX-EYE
= DC
= 2*|V
= 0.6 UI.
= |V
RXD+
(avg)
Comments
RX-D+
Freescale Semiconductor
= 2*|V
of |V
– V
– V
RX-DIFFp-p
RXD-
RX-D+
RX-D+
RX-D-
RX-MAX-JITTER
|/2 – V
– V
|
–V
= 0 V) in
RX-D-
RX-D-
RX-CM-DC
|/2
|
=