参数资料
型号: MPC8544DVTANG
厂商: FREESCALE SEMICONDUCTOR INC
元件分类: 微控制器/微处理器
英文描述: 32-BIT, 400 MHz, MICROPROCESSOR, PBGA783
封装: 29 X 29 MM, 1 MM PITCH, LEAD FREE, PLASTIC, FC-PBGA-783
文件页数: 103/128页
文件大小: 1411K
代理商: MPC8544DVTANG
MPC8544E PowerQUICC III Integrated Processor Hardware Specifications, Rev. 1
76
Freescale Semiconductor
High-Speed Serial Interfaces (HSSI)
Figure 52 shows the SerDes reference clock connection reference circuits for a single-ended clock driver.
It assumes the DC levels of the clock driver are compatible with MPC8544E SerDes reference clock
input’s DC requirement.
Figure 52. Single-Ended Connection (Reference Only)
16.2.4
AC Requirements for SerDes Reference Clocks
The clock driver selected should provide a high quality reference clock with low phase noise and
cycle-to-cycle jitter. Phase noise less than 100KHz can be tracked by the PLL and data recovery loops and
is less of a problem. Phase noise above 15MHz is filtered by the PLL. The most problematic phase noise
occurs in the 1-15MHz range. The source impedance of the clock driver should be 50 ohms to match the
transmission line and reduce reflections which are a source of noise to the system.
Table 58 describes some AC parameters common to SGMII, PCI Express and Serial RapidIO protocols.
Table 58. SerDes Reference Clock Common AC Parameters
At recommended operating conditions with XVDD_SRDS1 or XVDD_SRDS2 = 1.1V ± 5%.
Parameter
Symbol
Min
Max
Unit
Notes
Rising Edge Rate
Rise Edge
Rate
1.0
4.0
V/ns
2, 3
Falling Edge Rate
Fall Edge
Rate
1.0
4.0
V/ns
2, 3
Differential Input High Voltage
VIH
+200
mV
2
Differential Input Low Voltage
VIL
-200
mV
2
50
Ω
50
Ω
SDn_REF_CLK
100
Ω differential PWB trace
SerDes Refer.
CLK Receiver
Clock Driver
CLK_Out
Single-Ended
CLK Driver Chip
33
Ω
Total 50
Ω. Assume clock driver’s
output impedance is about 16
Ω.
50
Ω
MPC8544E
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