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MPC7441 数据表(PDF) 35 Page - Freescale Semiconductor, Inc |
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MPC7441 数据表(HTML) 35 Page - Freescale Semiconductor, Inc |
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35 / 60 page  MPC7448 RISC Microprocessor Hardware Specifications, Rev. 4 Freescale Semiconductor 35 System Design Information 9 System Design Information This section provides system and thermal design requirements and recommendations for successful application of the MPC7448. 9.1 Clocks The following sections provide more detailed information regarding the clocking of the MPC7448. 9.1.1 PLL Configuration The MPC7448 PLL is configured by the PLL_CFG[0:5] signals. For a given SYSCLK (bus) frequency, the PLL configuration signals set the internal CPU and VCO frequency of operation. The PLL configuration for the MPC7448 is shown in Table 12. In this example, shaded cells represent settings that, for a given SYSCLK frequency, result in core and/or VCO frequencies that do not comply with Table 8. When enabled, dynamic frequency switching (DFS) also affects the core frequency by halving or quartering the bus-to-core multiplier; see Section 9.7.5, “Dynamic Frequency Switching (DFS),” for more information. Note that when DFS is enabled the resulting core frequency must meet the adjusted minimum core frequency requirements (fcore_DFS) described in Table 8. Note that the PLL_CFG[5] is currently used for factory test only and should be tied low, and that the MPC7448 PLL configuration settings are compatible with the MPC7447A PLL configuration settings when PLL_CFG[5] = 0. Table 12. MPC7448 Microprocessor PLL Configuration Example PLL_CFG[0:5] Example Core and VCO Frequency in MHz Bus-to-Core Multiplier 5 Core-to-VCO Multiplier 5 Bus (SYSCLK) Frequency 33.3 MHz 50 MHz 66.6 MHz 75 MHz 83 MHz 100 MHz 133 MHz 167 MHz 200 MHz 010000 2x 6 1x 100000 3x 6 1x 600 101000 4x 6 1x 667 800 101100 5x 1x 667 835 1000 100100 5.5x 1x 733 919 1100 110100 6x 1x 600 800 1002 1200 010100 6.5x 1x 650 866 1086 1300 001000 7x 1x 700 931 1169 1400 000100 7.5x 1x 623 750 1000 1253 1500 110000 8x 1x 600 664 800 1064 1336 1600 011000 8.5x 1x 638 706 850 1131 1417 1700 011110 9x 1x 600 675 747 900 1197 1500 011100 9.5x 1x 633 712 789 950 1264 1583 101010 10x 1x 667 750 830 1000 1333 1667 100010 10.5x 1x 700 938 872 1050 1397 |
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