mpc8308 Freescale Semiconductor, Inc, mpc8308 Datasheet - Page 29

• Manufacturer Part Number: mpc8308
• Description: Mpc8308 Powerquicc Ii Pro Processor Hardware Specification
• Manufacturer: Freescale Semiconductor, Inc

Figure 20
assumes that the DC levels of the clock driver chip is compatible with MPC8308 SerDes reference clock
input’s DC requirement.
Freescale Semiconductor
HCSL CLK Driver Chip
Total 50 Ω. Assume clock driver’s
output impedance is about 16 Ω.
Clock Driver
Clock Driver
Figure 20. DC-Coupled Differential Connection with HCSL Clock Driver (Reference Only)
shows the SerDes reference clock connection reference circuits for HCSL type clock driver. It
CLK_Out
CLK_Out
CLK_Out
Figure 20
fact that clock driver chip's internal structure, output impedance, and
termination requirements are different between various clock driver chip
manufacturers, it is very possible that the clock circuit reference designs
provided by clock driver chip vendor are different from what is shown
below. They might also vary from one vendor to the other. Therefore,
Freescale Semiconductor can neither provide the optimal clock driver
reference circuits, nor guarantee the correctness of the following clock
driver connection reference circuits. The system designer is recommended
to contact the selected clock driver chip vendor for the optimal reference
circuits with the MPC8308 SerDes reference clock receiver requirement
provided in this document.
MPC8308 PowerQUICC II Pro Processor Hardware Specification, Rev. 1
to
33 Ω
33 Ω
Figure 23
Clock driver vendor dependent
source termination resistor
100 Ω differential PWB trace
below are for conceptual reference only. Due to the
NOTE
SD_REF_CLK
SD_REF_CLK
50 Ω
High-Speed Serial Interfaces (HSSI)
50 Ω
MPC8308
SerDes Refer.
CLK Receiver
29