mpc8640 Freescale Semiconductor, Inc, mpc8640 Datasheet - Page 67

• Manufacturer Part Number: mpc8640
• Description: Integrated Host Processor
• Manufacturer: Freescale Semiconductor, Inc

The other detailed AC requirements of the SerDes reference clocks is defined by each interface protocol
based on application usage. Refer to the following sections for detailed information:
13.3
Figure 49
The DC and AC specification of SerDes data lanes are defined in each interface protocol section below
(PCI Express or Serial Rapid IO) in this document based on the application usage:
Note that external AC Coupling capacitor is required for the above two serial transmission protocols with
the capacitor value defined in specification of each protocol section.
Freescale Semiconductor
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Section 14.2, “AC Requirements for PCI Express SerDes
Section 15.2, “AC Requirements for Serial RapidIO SDn_REF_CLK and
Section 14, “PCI Express”
Section 15, “Serial RapidIO”
SerDes Transmitter and Receiver Reference Circuits
shows the reference circuits for SerDes data lane’s transmitter and receiver.
SD n _REF_CLK
SD n _REF_CLK
Figure 48. Single-Ended Measurement Points for Rise and Fall Time Matching
MPC8640 and MPC8640D Integrated Host Processor Hardware Specifications, Rev. 3
Transmitter
Figure 49. SerDes Transmitter and Receiver Reference Circuits
50 Ω
50 Ω
SD1_TX n or
SD2_TX n
SD1_TX n or
SD2_TX n
SD n _REF_CLK
SD n _REF_CLK
SD1_RX n or
SD2_RX n
SD1_RX n or
SD2_RX n
Clocks”
50 Ω
50 Ω
High-Speed Serial Interfaces (HSSI)
Receiver
SDn_REF_CLK”
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