參數(shù)資料
型號： MPC8572VTAULD
廠商： Freescale Semiconductor
文件頁數(shù)： 48/138頁
文件大小： 0K
描述： MPU POWERQUICC III 1023-PBGA
標準包裝： 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
供應商設備封裝： 1023-FCPBGA（33x33）
包裝： 托盤
MPC8572E PowerQUICC III Integrated Processor Hardware Specifications, Rev. 5
Freescale Semiconductor
17
Input Clocks
4.4
DDR Clock Timing
Table 8 provides the DDR clock (DDRCLK) AC timing specifications for the MPC8572E.
EC_GTX_CLK125 rise and fall time
L/TVDD=2.5V
L/TVDD=3.3V
tG125R, tG125F
——
0.75
1.0
ns
1
EC_GTX_CLK125 duty cycle
GMII, TBI
1000Base-T for RGMII, RTBI
tG125H/tG125
45
47
—
55
53
%2, 3
Notes:
1. Rise and fall times for EC_GTX_CLK125 are measured from 0.5V and 2.0V for L/TVDD=2.5V, and from 0.6V and 2.7V
for L/TVDD=3.3V.
2. Timing is guaranteed by design and characterization.
3. 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 TSEC
for 10Base-T and 100Base-T reference clock.
Table 8. DDRCLK AC Timing Specifications
At recommended operating conditions with OVDD of 3.3V ± 5%.
Parameter/Condition
Symbol
Min
Typical
Max
Unit
Notes
DDRCLK frequency
fDDRCLK
66
—
100
MHz
1
DDRCLK cycle time
tDDRCLK
10.0
—
15.15
ns
—
DDRCLK rise and fall time
tKH, tKL
0.61.0
1.2ns
2
DDRCLK duty cycle
tKHK/tDDRCLK
40
—
60
%
3
DDRCLK jitter
—
+/– 150
ps
4, 5, 6
Notes:
1. Caution: The DDR complex clock to DDRCLK ratio settings must be chosen such that the resulting DDR complex
clock frequency does not exceed the maximum or minimum operating frequencies. Refer to Section 19.4,
“DDR/DDRCLK PLL Ratio,” for ratio settings.
2. Rise and fall times for DDRCLK 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 DDRCLK 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 DDRCLK 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 DDRCLK.
Table 7. EC_GTX_CLK125 AC Timing Specifications (continued)
At recommended operating conditions with LVDD/TVDD of 3.3V ± 5% or 2.5V ± 5% (continued)
Parameter/Condition
Symbol
Min
Typical
Max
Unit
Notes
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