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поискавой системы для электроныых деталей |
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поискавой системы для электроныых деталей |
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MPC8270VR датащи(PDF) 37 Page - Freescale Semiconductor, Inc |
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MPC8270VR датащи(HTML) 37 Page - Freescale Semiconductor, Inc |
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37 / 83 page  MPC8280 PowerQUICC II Family Hardware Specifications, Rev. 2 Freescale Semiconductor 37 Clock Configuration Modes 7.3 PCI Agent Mode These tables show configurations for PCI agent mode. The frequency values listed 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. Note that in PCI agent mode the following: 1101_001 50.0 100.0 2.5 125.0 250.0 3.5 175.0 350.0 5 25.0 50.0 1101_010 50.0 100.0 2.5 125.0 250.0 4 200.0 400.0 5 25.0 50.0 1101_011 50.0 100.0 2.5 125.0 250.0 4.5 225.0 450.0 5 25.0 50.0 1101_100 50.0 100.0 2.5 125.0 250.0 5 250.0 500.0 5 25.0 50.0 1101_101 62.5 125.0 2 125.0 250.0 3 187.5 375.0 5 25.0 50.0 1101_110 62.5 125.0 2 125.0 250.0 4 250.0 500.0 5 25.0 50.0 1110_000 50.0 100.0 3 150.0 300.0 3.5 175.0 350.0 6 25.0 50.0 1110_001 50.0 100.0 3 150.0 300.0 4 200.0 400.0 6 25.0 50.0 1110_010 50.0 100.0 3 150.0 300.0 4.5 225.0 450.0 6 25.0 50.0 1110_011 50.0 100.0 3 150.0 300.0 5 250.0 500.0 6 25.0 50.0 1110_100 50.0 100.0 3 150.0 300.0 5.5 275.0 550.0 6 25.0 50.0 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 Rev0.1 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 Table 17 shows, PCI_MODCK determines the PCI clock frequency range. See Table 20 for higher configurations. 3 MODCK_H = hard reset configuration word [28–31]. MODCK[1-3] = three hardware configuration pins. 4 60x and local bus frequency. Identical to CLKIN. 5 CPM multiplication factor = CPM clock/bus clock 6 CPU multiplication factor = Core PLL multiplication factor Table 20. Clock Configurations for PCI Host Mode (PCI_MODCK=1)1,2 (continued) Mode3 Bus Clock4 (MHz) CPM Multiplication Factor5 CPM Clock (MHz) CPU Multiplication Factor6 CPU Clock (MHz) PCI Division Factor PCI Clock (MHz) MODCK_H- MODCK[1-3] Low High Low High Low High Low High |
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