mpc8641 Freescale Semiconductor, Inc, mpc8641 Datasheet - Page 71

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

Freescale Semiconductor
T
T
MAX-JITTER
T
V
V
IDLE-DELTA
V
V
V
V
I
T
TX-SHORT
TX-EYE
TX-EYE-MEDIAN-to-
TX-RISE
TX-IDLE-MIN
TX-CM-ACp
TX-CM-DC-ACTIVE-
TX-CM-DC-LINE-DELTA
TX-IDLE-DIFFp
TX-RCV-DETECT
TX-DC-CM
Symbol
, T
TX-FALL
MPC8641 and MPC8641D Integrated Host Processor Hardware Specifications, Rev. 2
Table 49. Differential Transmitter (TX) Output Specifications (continued)
Minimum TX Eye
Width
Maximum time
between the jitter
median and
maximum
deviation from
the median.
D+/D– TX Output
Rise/Fall Time
RMS AC Peak
Common Mode
Output Voltage
Absolute Delta of
DC Common
Mode Voltage
During L0 and
Electrical Idle
Absolute Delta of
DC Common
Mode between
D+ and D–
Electrical Idle
differential Peak
Output Voltage
The amount of
voltage change
allowed during
Receiver
Detection
The TX DC
Common Mode
Voltage
TX Short Circuit
Current Limit
Minimum time
spent in
Electrical Idle
Parameter
0.125
0.70
Min
50
—
—
—
—
0
0
0
0
Nom
—
—
—
—
—
—
—
—
—
—
—
Max
0.15
100
600
3.6
—
—
20
25
20
90
—
Units
mV
mV
mV
mV
mV
mA
UI
UI
UI
UI
V
The maximum Transmitter jitter can be derived as
T
See Notes 2 and 3.
Jitter is defined as the measurement variation of the
crossing points (V
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 and 3.
See Notes 2 and 5
V
V
See Note 2
|V
Idle)
V
V
[Electrical Idle]
See Note 2.
|V
V
V
See Note 2.
V
See Note 2.
The total amount of voltage change that a transmitter
can apply to sense whether a low impedance
Receiver is present. See Note 6.
The allowed DC Common Mode voltage under any
conditions. See Note 6.
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
TX-MAX-JITTER
TX-CM-ACp
TX-CM-DC
TX-CM-DC
TX-CM-Idle-DC
TX-CM-DC-D+
TX-CM-DC-D-
TX-IDLE-DIFFp
TX-CM-DC (during L0)
TX-CM-DC-D+
|<=100 mV
= DC
= DC
= RMS(|V
= DC
= DC
= DC
– V
= |V
= 1 – T
(avg)
(avg)
TX-DIFFp-p
TX-CM-DC-D-
(avg)
TX-IDLE-D+
(avg)
(avg)
Comments
– V
of |V
of |V
TXD+
TX-EYE
of |V
of |V
TX-CM-Idle-DC (During Electrical
of |V
TX-D+
TX-D+
+ V
TX-D-
= 0 V) in relation to a
TX-D+
TX-D+
–V
= 0.3 UI.
| <= 25 mV
TXD-
+ V
+ V
TX-IDLE-D-
|
|
|/2 – V
TX-D-
TX-D-
+ V
TX-D-
|/2
|/2 [L0]
TX-CM-DC
| <= 20 mV
PCI Express
|/2
)
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