KMPC8548EVTAUJC Freescale Semiconductor, KMPC8548EVTAUJC Datasheet - Page 66

• Manufacturer Part Number: KMPC8548EVTAUJC
• Manufacturer: Freescale Semiconductor

Specifications of KMPC8548EVTAUJC

• Lead Free Status / Rohs Status: Supplier Unconfirmed

High-Speed Serial Interfaces (HSSI)
Figure 43
assumes that the DC levels of the clock driver chip is compatible with MPC8548E SerDes reference clock
input’s DC requirement.
Figure 44
Since LVDS clock driver’s common mode voltage is higher than the MPC8548E 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.
Figure 45
Since LVPECL driver’s DC levels (both common mode voltages and output swing) are incompatible with
the MPC8548E SerDes reference clock input’s DC requirement, AC-coupling has to be used.
assumes that the LVPECL clock driver’s output impedance is 50 Ω. R1 is used to DC-bias the LVPECL
66
LVDS CLK Driver Chip
HCSL CLK Driver Chip
Total 50 Ω. Assume clock driver’s
output impedance is about 16 Ω.
Clock Driver
Clock Driver
Clock Driver
Clock Driver
Figure 43. DC-Coupled Differential Connection with HCSL Clock Driver (Reference Only)
Figure 44. AC-Coupled Differential Connection with LVDS Clock Driver (Reference Only)
shows the SerDes reference clock connection reference circuits for HCSL type clock driver. It
shows the SerDes reference clock connection reference circuits for LVDS type clock driver.
shows the SerDes reference clock connection reference circuits for LVPECL type clock driver.
CLK_Out
CLK_Out
CLK_Out
CLK_Out
CLK_Out
MPC8548E PowerQUICC III Integrated Processor Hardware Specifications, Rev. 7
33 Ω
33 Ω
10 nF
10 nF
100 Ω Differential PWB Trace
Clock driver vendor dependent
source termination resistor
100 Ω Differential PWB Trace
SD_REF_CLK
SD_REF_CLK
SD_REF_CLK
SD_REF_CLK
50 Ω
50 Ω
50 Ω
50 Ω
Freescale Semiconductor
SerDes Refer.
CLK Receiver
SerDes Refer.
CLK Receiver
MPC8548E
MPC8548E
Figure 45