參數(shù)資料
型號: MPC8567EVTAUJJ
廠商: Freescale Semiconductor
文件頁數(shù): 49/139頁
文件大?。?/td> 0K
描述: MPU POWERQUICC III 1023-PBGA
標準包裝: 24
系列: MPC85xx
處理器類型: 32-位 MPC85xx PowerQUICC III
速度: 1.333GHz
電壓: 1.1V
安裝類型: 表面貼裝
封裝/外殼: 1023-BBGA,F(xiàn)CBGA
供應商設備封裝: 1023-FCPBGA(33x33)
包裝: 托盤
MPC8568E/MPC8567E PowerQUICC III Integrated Processor Hardware Specifications, Rev. 1
Freescale Semiconductor
17
Input Clocks
4.4
eTSEC Gigabit Reference Clock Timing
Table 9 provides the eTSEC gigabit reference clocks (EC_GTX_CLK125) AC timing specifications for
the MPC8568E.
4.5
FIFO Clock Speed Restrictions
Note the following FIFO maximum speed restrictions based on the platform speed.
For FIFO GMII mode:
FIFO TX/RX clock frequency <= platform clock frequency / 4.2
For example, if the platform frequency is 533 MHz, the FIFO TX/RX clock frequency should be no higher
than 127 MHz.
For FIFO encoded mode:
FIFO TX/RX clock frequency <= platform clock frequency / 3.2
For example, if the platform frequency is 533 MHz, the FIFO TX/RX clock frequency should be no higher
than 167 MHz
4.6
Other Input Clocks
For information on the input clocks of other functional blocks of the platform such as SerDes, and eTSEC,
see the specific section of this document.
Table 9. EC_GTX_CLK125 AC Timing Specifications
Parameter/Condition
Symbol
Min
Typical
Max
Unit
Notes
EC_GTX_CLK125 frequency
fG125
—125
MHz
EC_GTX_CLK125 cycle time
tG125
—8
ns
EC_GTX_CLK125 rise and fall time
L/TVDD = 2.5 V
L/TVDD = 3.3 V
tG125R, tG125F
0.75
1.0
ns
EC_GTX_CLK125 duty cycle
GMII, TBI
1000Base-T for RGMII, RTBI
tG125H/tG125
45
47
55
53
%1, 2
Notes:
1. Timing is guaranteed by design and characterization.
2. EC_GTX_CLK125 is used to generate the GTX clock for the eTSEC transmitter with 2% degradation.
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 8.2.6, “RGMII and RTBI AC Timing Specifications,” for duty cycle
for 10Base-T and 100Base-T reference clock.
3. Rise and fall times for EC_GTX_CLK125 are measured from 0.5 and 2.0 V for L/TVDD = 2.5 V, and from 0.6 and 2.7
V for L/TVDD = 3.3 V.
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