參數(shù)資料
型號: MPC8544VTARJ
廠商: FREESCALE SEMICONDUCTOR INC
元件分類: 微控制器/微處理器
英文描述: 32-BIT, 533 MHz, MICROPROCESSOR, PBGA783
封裝: 29 X 29 MM, 1 MM PITCH, LEAD FREE, PLASTIC, FC-PBGA-783
文件頁數(shù): 21/112頁
文件大?。?/td> 1294K
代理商: MPC8544VTARJ
MPC8544E PowerQUICC III Integrated Processor Hardware Specifications, Rev. 0
16
Freescale Semiconductor
Input Clocks
4.4
Platform to FIFO Restrictions
Please note the following FIFO maximum speed restrictions based on 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 more
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 more
than 167 MHz.
4.5
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.
EC_GTX_CLK125 duty cycle
GMII, TBI
1000Base-T for RGMII, RTBI
tG125H/tG125
45
47
55
53
%2
Notes:
1. 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.
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 8.4.6, “RGMII and RTBI AC Timing Specifications,for duty cycle for 10Base-T and 100Base-T
reference clock.
Table 8. EC_GTX_CLK125 AC Timing Specifications (continued)
Parameter/Condition
Symbol
Min
Typical
Max
Unit
Notes
相關PDF資料
PDF描述
MPC8548ECVTAVHB 32-BIT, 1500 MHz, MICROPROCESSOR, PBGA783
MPC8548ECVUATG 32-BIT, 1200 MHz, MICROPROCESSOR, CBGA783
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