参数资料
型号: MPC8378E-MDS-PB
厂商: Freescale Semiconductor
文件页数: 113/128页
文件大小: 0K
描述: BOARD PROCESSOR FOR MDS S
标准包装: 1
类型: MPU
适用于相关产品: MPC8378
所含物品:
MPC8378E PowerQUICC II Pro Processor Hardware Specifications, Rev. 8
Freescale Semiconductor
85
This figure shows the SerDes reference clock connection reference circuits for HCSL type clock driver. It
assumes that the DC levels of the clock driver chip is compatible with device SerDes reference clock
input’s DC requirement.
Figure 59. DC-Coupled Differential Connection with HCSL Clock Driver (Reference Only)
This figure shows the SerDes reference clock connection reference circuits for LVDS type clock driver.
Since LVDS clock driver’s common-mode voltage is higher than the device SerDes reference clock input’s
allowed range (100 to 400 mV), AC-coupled connection scheme must be used. It assumes the LVDS
output driver features a 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 60. AC-Coupled Differential Connection with LVDS Clock Driver (Reference Only)
Figure 61 shows the SerDes reference clock connection reference circuits for LVPECL type clock driver.
Since LVPECL driver’s DC levels (both common mode voltages and output swing) are incompatible with
device SerDes reference clock input’s DC requirement, AC-coupling has to be used. Figure 61 assumes
50
Ω
50
Ω
SD
n_REF_CLK
SD
n_REF_CLK
Clock Driver
100
Ω differential PWB trace
Clock driver vendor dependent
source termination resistor
SerDes Refer.
CLK Receiver
Clock Driver
CLK_Out
HCSL CLK Driver Chip
33
Ω
33
Ω
Total 50
Ω. Assume clock driver’s
output impedance is about 16
Ω.
Chip
CLK_Out
50
Ω
50
Ω
SD
n_REF_CLK
SD
n_REF_CLK
Clock Driver
100
Ω differential PWB trace
SerDes Refer.
CLK Receiver
Clock Driver
CLK_Out
LVDS CLK Driver Chip
10 nF
Chip
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