參數(shù)資料
型號: MPC8568ECVTANGGA
廠商: FREESCALE SEMICONDUCTOR INC
元件分類: 微控制器/微處理器
英文描述: 32-BIT, 800 MHz, RISC PROCESSOR, PBGA1023
封裝: 33 X 33 MM, 2.75 MM HEIGHT, 1 MM PITCH, LEAD FREE, PLASTIC, FCBGA-1023
文件頁數(shù): 48/139頁
文件大?。?/td> 1449K
代理商: MPC8568ECVTANGGA
MPC8568E/MPC8567E PowerQUICC III Integrated Processor Hardware Specifications, Rev. 1
16
Freescale Semiconductor
Input Clocks
4.2
PCI Clock Timing
Table 8 provides the PCI clock (PCI_CLK) AC timing specifications for the MPC8568E.
4.3
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 Time Base unit of the e500. There is no need for 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.
SYSCLK jitter
+/– 150
ps
4, 5
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 23.2, “CCB/SYSCLK PLL Ratio and Section 23.3,
“e500 Core PLL Ratio,” for ratio settings.
2. Rise and fall times for SYSCLK are measured at 0.4 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.
Table 8. PCI_CLK AC Timing Specifications
At recommended operating conditions (see Table 3) with OVDD = 3.3 V ± 165 mV.
Parameter/Condition
Symbol
Min
Typical
Max
Unit
Notes
PCI_CLK frequency
fPCI_CLK
——
66.7
MHz
PCI_CLK cycle time
tPCI_CLK
15
ns
PCI_CLK rise and fall time
tKH, tKL
0.6
1.0
2.3
ns
1
PCI_CLK duty cycle
tKHK/tPCI_CLK
40
60
%
2
PCI_CLK jitter
+/– 150
ps
3,4
Notes:
1. Rise and fall times for PCI_CLK are measured at 0.4 V and 2.7 V.
2. Timing is guaranteed by design and characterization.
3. This represents the total input jitter—short term and long term—and is guaranteed by design.
4. 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.
Table 7. SYSCLK AC Timing Specifications (continued)
At recommended operating conditions (see Table 3) with OVDD = 3.3 V ± 165 mV.
Parameter/Condition
Symbol
Min
Typical
Max
Unit
Notes
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