mpc8536e Freescale Semiconductor, Inc, mpc8536e Datasheet - Page 114

• Manufacturer Part Number: mpc8536e
• Description: Mpc8536e Powerquicctm Iii Integrated Processor Hardware Specifications
• Manufacturer: Freescale Semiconductor, Inc

System Clocking
Figure 74
The heat sink removes most of the heat from the device for most applications. Heat generated on the active side of the chip is
conducted through the silicon and through the heat sink attach material (or thermal interface material), and finally to the heat
sink. The junction-to-case thermal resistance is low enough that the heat sink attach material and heat sink thermal resistance
are the dominant terms.
2.24.3.2
A thermal interface material is required at the package-to-heat sink interface to minimize the thermal contact resistance. The
performance of thermal interface materials improves with increased contact pressure. This performance characteristic chart is
generally provided by the thermal interface vendors.
3
This section provides electrical and thermal design recommendations for successful application of the MPC8536E.
3.1
This device includes seven PLLs:
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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 2.23.2, “CCB/SYSCLK PLL Ratio.”
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
“e500 Core PLL
The PCI PLL generates the clocking for the PCI bus
The local bus PLL generates the clock for the local bus.
There is a PLL for the SerDes1 block to be used for PCI Express interface
There is a PLL for the SerDes2 block to be used for SGMII and SATA interfaces.
The DDR PLL generates the DDR clock from the externally supplied DDRCLK input in asynchronous mode. The
frequency ratio between the DDR clock and DDRCLK is described in
depicts the primary heat transfer path for a package with an attached heat sink mounted to a printed-circuit board.
Hardware Design Considerations
System Clocking
Thermal Interface Materials
(Note the internal versus external package resistance)
MPC8536E PowerQUICC™ III Integrated Processor Hardware Specifications, Rev. 2
External Resistance
External Resistance
Internal Resistance
Figure 74. Package with Heat Sink Mounted to a Printed-Circuit Board
Ratio/”
Printed-Circuit Board
Heat Sink
Radiation
Radiation
Convection
Convection
Thermal Interface Material
Section 2.23.4, “DDR/DDRCLK PLL Ratio.”
Die/Package
Die Junction
Package/Solder Spheres
Freescale Semiconductor
Section 2.23.3,