參數(shù)資料
型號: MPC8378CVRANFA
廠商: FREESCALE SEMICONDUCTOR INC
元件分類: 微控制器/微處理器
英文描述: 32-BIT, 333 MHz, MICROPROCESSOR, PBGA689
封裝: 31 X 31 MM, 2.46 MM HEIGHT, 1 MM PITCH, LEAD FREE, PLASTIC, BGA-689
文件頁數(shù): 32/125頁
文件大?。?/td> 894K
代理商: MPC8378CVRANFA
MPC8378E PowerQUICC II Pro Processor Hardware Specifications, Rev. 5
Freescale Semiconductor
14
4.3
eTSEC Gigabit Reference Clock Timing
The following table provides the eTSEC gigabit reference clocks (EC_GTX_CLK125) AC timing specifications.
Table 9. EC_GTX_CLK125 AC Timing Specifications
At recommended operating conditions with LVDD = 2.5 ± 0.125 mV/ 3.3 V ± 165 mV
Parameter/Condition
Symbol
Min
Typical
Max
Unit
Note
EC_GTX_CLK125 frequency
tG125
—125
MHz
EC_GTX_CLK125 cycle time
tG125
—8
ns
EC_GTX_CLK rise and fall time
LVDD = 2.5 V
LVDD = 3.3 V
tG125R/tG125F
——
0.75
1.0
ns
EC_GTX_CLK125 duty cycle
1000Base-T for RGMII, RTBI
tG125H/tG125
47
53
%
EC_GTX_CLK125 jitter
±150
ps
Notes:
1. Rise and fall times for EC_GTX_CLK125 are measured from 0.5 and 2.0 V for LVDD = 2.5 V and from 0.6 and 2.7 V for
LVDD =3.3 V.
2. EC_GTX_CLK125 is used to generate the GTX clock for the eTSEC transmitter with 2% degradation. The
EC_GTX_CLK125 duty cycle can be loosened from 47%/53% as long as the PHY device can tolerate the duty cycle
generated by the eTSEC GTX_CLK. See Section 8.3.4, “RGMII and RTBI AC Timing Specifications,for the duty cycle for
10Base-T and 100Base-T reference clock.
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