参数资料
型号: MPC8572EVTAVLB
厂商: FREESCALE SEMICONDUCTOR INC
元件分类: 微控制器/微处理器
英文描述: 32-BIT, 1500 MHz, MICROPROCESSOR, PBGA1023
封装: 33 X 33 MM, LEAD FREE, PLASTIC, FCBGA-1023
文件页数: 78/138页
文件大小: 1502K
代理商: MPC8572EVTAVLB
MPC8572E PowerQUICC III Integrated Processor Hardware Specifications, Rev. 2
44
Freescale Semiconductor
Ethernet: Enhanced Three-Speed Ethernet (eTSEC)
When operating in SGMII mode, the eTSEC EC_GTX_CLK125 clock is not required for this port. Instead,
SerDes reference clock is required on SD2_REF_CLK and SD2_REF_CLK pins.
8.3.1
DC Requirements for SGMII SD2_REF_CLK and SD2_REF_CLK
The characteristics and DC requirements of the separate SerDes reference clock are described in
8.3.2
AC Requirements for SGMII SD2_REF_CLK and SD2_REF_CLK
Table 36 lists the SGMII SerDes reference clock AC requirements. Please note that SD2_REF_CLK and
SD2_REF_CLK are not intended to be used with, and should not be clocked by, a spread spectrum clock
source.
Table 36. SD2_REF_CLK and SD2_REF_CLK AC Requirements
Symbol
Parameter Description
Min
Typical
Max
Units
Notes
tREF
REFCLK cycle time
—
10 (8)
—
ns
1
tREFCJ
REFCLK cycle-to-cycle jitter. Difference in the period of any two
adjacent REFCLK cycles
——
100
ps
—
tREFPJ
Phase jitter. Deviation in edge location with respect to mean edge
location
–50
—
50
ps
—
Note:
1. 8 ns applies only when 125 MHz SerDes2 reference clock frequency is selected via cfg_srds_sgmii_refclk during POR.
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