参数资料
型号: MPC8314EVRAGDA
厂商: FREESCALE SEMICONDUCTOR INC
元件分类: 微控制器/微处理器
英文描述: MICROPROCESSOR, PBGA620
封装: 29 X 29 MM, LEAD FREE, PLASTIC, TEPBGA-620
文件页数: 33/106页
文件大小: 1253K
代理商: MPC8314EVRAGDA
MPC8314E PowerQUICC II Pro Processor Hardware Specifications, Rev. 0
32
Freescale Semiconductor
Ethernet: Three-Speed Ethernet, MII Management
9.5
SGMII Interface Electrical Characteristics
Each SGMII port features a 4-wire AC-Coupled serial link from the dedicated SerDes interface of
MPC8315E as shown in Figure 17, where CTX is the external (on board) AC-Coupled capacitor. Each
output pin of the SerDes transmitter differential pair features 50-
Ω output impedance. Each input of the
SerDes receiver differential pair features 50-
Ω on-die termination to XCOREVSS. The reference circuit
of the SerDes transmitter and receiver is shown in Figure 48.
When an eTSEC port is configured to operate in SGMII mode, the parallel interface’s output signals of
this eTSEC port can be left floating. The input signals should be terminated based on the guidelines
described in Section 25.4, “Connection Recommendations,” as long as such termination does not violate
the desired POR configuration requirement on these pins, if applicable.
When operating in SGMII mode, the TSEC_GTX_CLK125 clock is not required for this port. Instead,
SerDes reference clock is required on SD_REF_CLK and SD_REF_CLK pins.
9.5.1
DC Requirements for SGMII SD_REF_CLK and SD_REF_CLK
The characteristics and DC requirements of the separate SerDes reference clock are described in
9.5.2
AC Requirements for SGMII SD_REF_CLK and SD_REF_CLK
Table 34 lists the SGMII SerDes reference clock AC requirements. Please note that SD_REF_CLK and
SD_REF_CLK are not intended to be used with, and should not be clocked by, a spread spectrum clock
source.
Output clock to output valid
tGCLKNV
06
ns
Timer alarm to output valid
tTMRAL
———
2
Note:
1. The timer can operate on rtc_clock or tmr_clock. These clocks get muxed and any one of them can be selected.
2. Asynchronous signals.
3. Inputs need to be stable at least one TMR clock.
Table 34. SD_REF_CLK and SD_REF_CLK AC Requirements
Symbol
Parameter Description
Min
Typical
Max
Units
Notes
tREF
REFCLK cycle time
-
8
-
ns
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
Table 33. 1588 Timer AC Specifications (continued)
Parameter
Symbol
Min
Max
Unit
Notes
相关PDF资料
PDF描述
MPC8315EVRAFDA 32-BIT, 333 MHz, MICROPROCESSOR, PBGA620
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MPC8315VRAFDA 32-BIT, 333 MHz, MICROPROCESSOR, PBGA620
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