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MPC8280 Datasheet(PDF) 41 Page - Freescale Semiconductor, Inc |
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MPC8280 Datasheet(HTML) 41 Page - Freescale Semiconductor, Inc |
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41 / 83 page  MPC8280 PowerQUICC II Family Hardware Specifications, Rev. 2 Freescale Semiconductor 41 Clock Configuration Modes 1110_011 50.0 66.7 5 250.0 333.3 4 500.0 666.6 2 125.0 166.7 1110_100 50.0 66.7 5 250.0 333.3 4 333.3 444.4 3 83.3 111.1 1110_101 50.0 66.7 5 250.0 333.3 4.5 375.0 500.0 3 83.3 111.1 1110_110 50.0 66.7 5 250.0 333.3 5 416.7 555.5 3 83.3 111.1 1110_111 50.0 66.7 5 250.0 333.3 5.5 458.3 611.1 3 83.3 111.1 1100_000 Reserved 1100_001 Reserved 1100_010 Reserved 1 The “low” values are the minimum allowable frequencies for a given clock mode. The minimum bus frequency in a table entry guarantees only the required minimum CPU operating frequency. The “high” values are for the purpose of illustration only. Users must select a mode and input bus frequency so that the resulting configuration does not violate the frequency rating of the user’s device. The minimum CPM frequency is 120 MHz. Minimum CPU frequency is determined by the clock mode. For modes with a CPU multiplication factor <= 3, the minimum CPU frequency is 150 MHz for commercial temperature devices and 175 MHz for extended temperature devices. For modes with a CPU multiplication factor >= 3.5: for Rev 0.1 the minimum CPU frequency is 250 MHz; for Rev A or later the minimum CPU frequency is 150 MHz for commercial temperature devices and 175 MHz for extended temperature devices. 2 As shown in Table 17, PCI_MODCK determines the PCI clock frequency range. See Table 20 for lower configurations. 3 MODCK_H = hard reset configuration word [28–31]. MODCK[1-3] = three hardware configuration pins. 4 CPM multiplication factor = CPM clock/PCI clock 5 CPU multiplication factor = Core PLL multiplication factor Table 22. Clock Configurations for PCI Agent Mode (PCI_MODCK=1)1,2 Mode3 PCI Clock (MHz) CPM Multiplication Factor4 CPM Clock (MHz) CPU Multiplication Factor5 CPU Clock (MHz) Bus Division Factor Bus Clock (MHz) MODCK_H- MODCK[1-3] Low High Low High Low High Low High Default Modes (MODCK_H=0000) 0000_000 30.0 50.0 4 120.0 200.0 2.5 150.0 250.0 2 60.0 100.0 0000_001 25.0 50.0 4 100.0 200.0 3 150.0 300.0 2 50.0 100.0 0000_010 25.0 50.0 6 150.0 300.0 3 150.0 300.0 3 50.0 100.0 0000_011 25.0 50.0 6 150.0 300.0 4 200.0 400.0 3 50.0 100.0 0000_100 25.0 50.0 6 150.0 300.0 3 180.0 360.0 2.5 60.0 120.0 0000_101 25.0 50.0 6 150.0 300.0 3.5 210.0 420.0 2.5 60.0 120.0 0000_110 25.0 50.0 8 200.0 400.0 3.5 233.3 466.7 3 66.7 133.3 Table 21. Clock Configurations for PCI Agent Mode (PCI_MODCK=0)1,2 (continued) Mode3 PCI Clock (MHz) CPM Multiplication Factor4 CPM Clock (MHz) CPU Multiplication Factor5 CPU Clock (MHz) Bus Division Factor Bus Clock (MHz) MODCK_H- MODCK[1-3] Low High Low High Low High Low High |
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