mpc8641 Freescale Semiconductor, Inc, mpc8641 Datasheet - Page 70

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

PCI Express
14.1
For more information, see
14.2
Table 48
14.3
The ports on the two ends of a link must transmit data at a rate that is within 600 parts per million (ppm)
of each other at all times. This is specified to allow bit rate clock sources with a +/– 300 ppm tolerance.
14.4
The following is a summary of the specifications for the physical layer of PCI Express on this device. For
further details as well as the specifications of the Transport and Data Link layer please use the PCI
EXPRESS Base Specification. REV. 1.0a document.
14.4.1
Table 49
specified at the component pins.
70
UI
V
V
Symbol
t
t
TX-DIFFp-p
TX-DE-RATIO
REFCJ
REFPJ
t
REF
Symbol
REFCLK cycle time
REFCLK cycle-to-cycle jitter. Difference in the period of any two
adjacent REFCLK cycles
Phase jitter. Deviation in edge location with respect to mean
edge location
defines the specifications for the differential output at all transmitters (TXs). The parameters are
lists AC requirements.
DC Requirements for PCI Express SD n _REF_CLK and
SD n _REF_CLK
AC Requirements for PCI Express SerDes Clocks
Clocking Dependencies
Physical Layer Specifications
Differential Transmitter (TX) Output
MPC8641 and MPC8641D Integrated Host Processor Hardware Specifications, Rev. 2
Unit Interval
Differential
Peak-to-Peak
Output Voltage
De- Emphasized
Differential
Output Voltage
(Ratio)
Table 48. SD n _REF_CLK and SD n _REF_CLK AC Requirements
Parameter
Table 49. Differential Transmitter (TX) Output Specifications
Parameter Description
Section 13.2, “SerDes Reference Clocks.”
399.88
–3.0
Min
0.8
Nom
–3.5
400
—
400.12
Max
–4.0
1.2
Units
dB
ps
V
Each UI is 400 ps ± 300 ppm. UI does not account for
Spread Spectrum Clock dictated variations. See Note
1.
V
Ratio of the V
bits after a transition divided by the V
first bit after a transition. See Note 2.
TX-DIFFp-p
Min
–50
—
—
Typical
= 2*|V
TX-DIFFp-p
10
—
—
TX-D+
Comments
Max
100
50
—
– V
of the second and following
TX-D-
Freescale Semiconductor
Units
ps
ps
ns
| See Note 2.
TX-DIFFp-p
Notes
—
—
—
of the