mpc8568e Freescale Semiconductor, Inc, mpc8568e Datasheet - Page 70

• Manufacturer Part Number: mpc8568e
• Description: Mpc8568e Powerquicc Iii Processor
• Manufacturer: Freescale Semiconductor, Inc

PCI Express
13.3
Figure 48
The DC and AC specification of SerDes data lanes are defined in each interface protocol section below
(PCI Express, Serial Rapid IO or SGMII) in this document based on the application usage:
Please 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.
14 PCI Express
This section describes the DC and AC electrical specifications for the PCI Express bus of the MPC8568E.
14.1
For more information, see
14.2
Table 50
70
Symbol
t
REFCJ
t
REF
•
•
Section 14, “PCI
Section 15, “Serial
lists AC requirements.
REFCLK cycle time
REFCLK cycle-to-cycle jitter. Difference in the period of any two
adjacent REFCLK cycles
SerDes Transmitter and Receiver Reference Circuits
DC Requirements for PCI Express SD_REF_CLK and
SD_REF_CLK
AC Requirements for PCI Express SerDes Clocks
shows the reference circuits for SerDes data lane’s transmitter and receiver.
MPC8568E/MPC8567E PowerQUICC III™ Integrated Processor Hardware Specifications, Rev. 0
Transmitter
Figure 48. SerDes Transmitter and Receiver Reference Circuits
Table 50. SD_REF_CLK and SD_REF_CLK AC Requirements
Express”
Parameter Description
Section 13, “High-Speed Serial Interfaces (HSSI).”
RapidIO”
50 Ω
50 Ω
SD_TXn
SD_TXn
SD_RXn
SD_RXn
Min
—
—
Typical
50 Ω
50 Ω
10
—
Receiver
Max
100
—
Freescale Semiconductor
Units
ns
ps
Notes
—
1