ppc8572elpxavnd Freescale Semiconductor, Inc, ppc8572elpxavnd Datasheet - Page 82

• Manufacturer Part Number: ppc8572elpxavnd
• Description: Mpc8572e Powerquicc Iii Integrated Communications Processors
• Manufacturer: Freescale Semiconductor, Inc

PCI Express
Note that external AC Coupling capacitor is required for the above three serial transmission protocols with
the capacitor value defined in specification of each protocol section.
16 PCI Express
This section describes the DC and AC electrical specifications for the PCI Express bus of the MPC8572E.
16.1
For more information, see
16.2
Table 60
16.3
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.
16.4
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, Use the PCI Express Base
Specification. REV. 1.0a document.
16.4.1
Table 61
specified at the component pins.
82
Notes:
1. Typical cycle time is based on PCI Express Card Electromechanical Specification Revision 1.0a.
Symbol
t
t
REFCJ
REFPJ
t
REF
•
•
Section 16, “PCI
Section 17, “Serial
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
lists AC requirements.
defines the specifications for the differential output at all transmitters (TXs). The parameters are
DC Requirements for PCI Express SD1_REF_CLK and
AC Requirements for PCI Express SerDes Reference Clocks
Clocking Dependencies
Physical Layer Specifications
SD1_REF_CLK
Differential Transmitter (TX) Output
MPC8572E PowerQUICC III Integrated Processor Hardware Specifications, Rev. 4
Table 60. SD1_REF_CLK and SD1_REF_CLK AC Requirements
Express”
Section 15.2, “SerDes Reference Clocks.”
RapidIO”
Parameter Description
Min
–50
—
—
Typical
10
—
—
Freescale Semiconductor
Max Units Notes
100
50
—
ns
ps
ps
—
—
1