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MPC8248VR データシート(PDF) 39 Page - Freescale Semiconductor, Inc |
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MPC8248VR データシート(HTML) 39 Page - Freescale Semiconductor, Inc |
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39 / 61 page ![]() MPC8272 PowerQUICC II Family Hardware Specifications, Rev. 3 Freescale Semiconductor 39 Clock Configuration Modes 1100_101 50.0 66.7 6 300.0 400.0 4 400.0 533.3 3 100.0 133.3 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 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 exceed the frequency rating of the user’s device. The minimum CPU frequency is 150 MHz for commercial temperature devices and 175 MHz for extended temperature devices. The minimum CPM frequency is 120 MHz. 2 PCI_MODCK determines the PCI clock frequency range. See Table 20 for lower range configurations. 3 MODCK_H = hard reset configuration word [28–31] (see Section 5.4 in the SoC reference manual). MODCK[1-3] = three hardware configuration pins. 4 CPM multiplication factor = CPM clock/bus clock 5 CPU multiplication factor = Core PLL multiplication factor Table 19. 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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