參數(shù)資料
型號: MPC8572EVTAULE
廠商: Freescale Semiconductor
文件頁數(shù): 47/138頁
文件大?。?/td> 0K
描述: MPU POWERQUICC III 1023FCPBGA
標(biāo)準(zhǔn)包裝: 1
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(yīng)商設(shè)備封裝: 1023-FCPBGA(33x33)
包裝: 托盤
MPC8572E PowerQUICC III Integrated Processor Hardware Specifications, Rev. 5
16
Freescale Semiconductor
Input Clocks
4
Input Clocks
4.1
System Clock Timing
Table 6 provides the system clock (SYSCLK) AC timing specifications for the MPC8572E.
4.2
Real Time Clock Timing
The RTC input is sampled by the platform clock (CCB clock). The output of the sampling latch is then
used as an input to the counters of the PIC and the TimeBase unit of the e500. There is no jitter
specification. The minimum pulse width of the RTC signal should be greater than 2x the period of the CCB
clock. That is, minimum clock high time is 2
× tCCB, and minimum clock low time is 2 × tCCB. There is
no minimum RTC frequency; RTC may be grounded if not needed.
4.3
eTSEC Gigabit Reference Clock Timing
Table 7 provides the eTSEC gigabit reference clocks (EC_GTX_CLK125) AC timing specifications for
the MPC8572E.
Table 6. SYSCLK AC Timing Specifications
At recommended operating conditions with OVDD of 3.3V ± 5%.
Parameter/Condition
Symbol
Min
Typical
Max
Unit
Notes
SYSCLK frequency
fSYSCLK
33
133
MHz
1
SYSCLK cycle time
tSYSCLK
7.5
30.3
ns
SYSCLK rise and fall time
tKH, tKL
0.61.0
1.2ns
2
SYSCLK duty cycle
tKHK/tSYSCLK
40
60
%
3
SYSCLK jitter
+/– 150
ps
4, 5, 6
Notes:
1. Caution: The CCB clock to SYSCLK ratio and e500 core to CCB clock ratio settings must be chosen such that the resulting
SYSCLK frequency, e500 (core) frequency, and CCB clock frequency do not exceed their respective maximum or minimum
operating frequencies.Refer to Section 19.2, “CCB/SYSCLK PLL Ratio,” and Section 19.3, “e500 Core PLL Ratio,for ratio
settings.
2. Rise and fall times for SYSCLK are measured at 0.6 V and 2.7 V.
3. Timing is guaranteed by design and characterization.
4. This represents the total input jitter—short term and long term—and is guaranteed by design.
5. The SYSCLK driver’s closed loop jitter bandwidth should be <500 kHz at –20 dB. The bandwidth must be set low to allow
cascade-connected PLL-based devices to track SYSCLK drivers with the specified jitter.
6. For spread spectrum clocking, guidelines are +0% to –1% down spread at a modulation rate between 20 kHz and 60 kHz on
SYSCLK.
Table 7. EC_GTX_CLK125 AC Timing Specifications
At recommended operating conditions with LVDD/TVDD of 3.3V ± 5% or 2.5V ± 5%
Parameter/Condition
Symbol
Min
Typical
Max
Unit
Notes
EC_GTX_CLK125 frequency
fG125
—125
MHz
EC_GTX_CLK125 cycle time
tG125
—8
ns
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