mpc8308 Freescale Semiconductor, Inc, mpc8308 Datasheet - Page 30

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

High-Speed Serial Interfaces (HSSI)
Figure 21
Since LVDS clock driver’s common mode voltage is higher than the MPC8308’s SerDes reference clock
input’s allowed range (100–400 mV), AC-coupled connection scheme must be used. It assumes the LVDS
output driver features 50-Ω termination resistor. It also assumes that the LVDS transmitter establishes its
own common mode level without relying on the receiver or other external component.
30
LVDS CLK Driver Chip
Clock Driver
Clock Driver
Figure 21. AC-Coupled Differential Connection with LVDS Clock Driver (Reference Only)
shows the SerDes reference clock connection reference circuits for LVDS type clock driver.
CLK_Out
CLK_Out
MPC8308 PowerQUICC II Pro Processor Hardware Specification, Rev. 1
10 nF
10 nF
100 Ω differential PWB trace
SD_REF_CLK
SD_REF_CLK
50 Ω
50 Ω
Freescale Semiconductor
MPC8308
SerDes Refer.
CLK Receiver