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| 型号： | MPC8560VTAQFC |
| 厂商： | Freescale Semiconductor |
| 文件页数： | 101/108页 |
| 文件大小： | 0K |
| 描述： | MPU POWERQUICC III 783FCPBGA |
| 标准包装： | 36 |
| 系列： | MPC85xx |
| 处理器类型： | 32-位 MPC85xx PowerQUICC III |
| 速度： | 1.0GHz |
| 电压： | 1.3V |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 784-BBGA，FCBGA |
| 供应商设备封装： | 783-FCPBGA（29x29） |
| 包装： | 托盘 |
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MPC8560 Integrated Processor Hardware Specifications, Rev. 4.2
92
Freescale Semiconductor
System Design Information
17 System Design Information
This section provides electrical and thermal design recommendations for successful application of the
MPC8560.
17.1 System Clocking
The MPC8560 includes three PLLs.
1. The platform PLL generates the platform clock from the externally supplied SYSCLK input. The
frequency ratio between the platform and SYSCLK is selected using the platform PLL ratio
configuration bits as described in Section 15.2, “Platform/System PLL Ratio.”
2. The e500 Core PLL generates the core clock as a slave to the platform clock. The frequency ratio
between the e500 core clock and the platform clock is selected using the e500 PLL ratio
configuration bits as described in Section 15.3, “e500 Core PLL Ratio.”
3. The CPM PLL is slaved to the platform clock and is used to generate clocks used internally by the
CPM block. The ratio between the CPM PLL and the platform clock is fixed and not under user
control.
17.2 PLL Power Supply Filtering
Each of the PLLs listed above is provided with power through independent power supply pins (AVDD1,
AVDD2, and AVDD3, respectively). The AVDD level should always be equivalent to VDD, and preferably
these voltages will be derived directly from VDD through a low frequency filter scheme such as the
following.
There are a number of ways to reliably provide power to the PLLs, but the recommended solution is to
provide three independent filter circuits as illustrated in Figure 58, one to each of the three AVDD pins. By
providing independent filters to each PLL the opportunity to cause noise injection from one PLL to the
other is reduced.
This circuit is intended to filter noise in the PLLs resonant frequency range from a 500 kHz to 10 MHz
range. It should be built with surface mount capacitors with minimum Effective Series Inductance (ESL).
Consistent with the recommendations of Dr. Howard Johnson in High Speed Digital Design: A Handbook
of Black Magic (Prentice Hall, 1993), multiple small capacitors of equal value are recommended over a
single large value capacitor.
Each circuit should be placed as close as possible to the specific AVDD pin being supplied to minimize
noise coupled from nearby circuits. It should be possible to route directly from the capacitors to the AVDD
pin, which is on the periphery of the 783 FC-PBGA footprint, without the inductance of vias.
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