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MPC8275VR 数据表(PDF) 37 Page - Motorola, Inc |
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MPC8275VR 数据表(HTML) 37 Page - Motorola, Inc |
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37 / 76 page ![]() MOTOROLA MPC8280 PowerQUICC II™ Family Hardware Specifications 37 Clock Configuration Modes 1100_110 50.0 66.7 6 300.0 400.0 4.5 450.0 599.9 3 100.0 133.3 1100_111 50.0 66.7 6 300.0 400.0 5 500.0 666.6 3 100.0 133.3 1101_000 50.0 66.7 6 300.0 400.0 5.5 550.0 733.3 3 100.0 133.3 1101_001 50.0 66.7 6 300.0 400.0 3.5 420.0 559.9 2.5 120.0 160.0 1101_010 50.0 66.7 6 300.0 400.0 4 480.0 639.9 2.5 120.0 160.0 1101_011 50.0 66.7 6 300.0 400.0 4.5 540.0 719.9 2.5 120.0 160.0 1101_100 50.0 66.7 6 300.0 400.0 5 600.0 799.9 2.5 120.0 160.0 1110_000 50.0 66.7 5 250.0 333.3 2.5 312.5 416.6 2 125.0 166.7 1110_001 50.0 66.7 5 250.0 333.3 3 375.0 500.0 2 125.0 166.7 1110_010 50.0 66.7 5 250.0 333.3 3.5 437.5 583.3 2 125.0 166.7 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 “Low” values are the minimum allowable frequencies for a given clock mode. The minimum bus frequency guarantees the required minimum CPU operating frequency. Minimum CPU frequency is determined by the clock mode. For modes with a CPU multiplication factor ≤ 3, the minimum CPU frequency is 166 MHz.The minimum CPM frequency is 133 MHz. For modes with a CPU multiplication factor ≥ 3.5, the minimum CPU frequency is 250 MHz. The minimum CPM frequency is as shown in the table. “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 exceed the frequency rating of the user’s device. 2 As shown in Table 14, PCI_MODCK determines the PCI clock frequency range. Refer to Table 19 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 18. 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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