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MPC8275ZQ Datasheet(PDF) 34 Page - Motorola, Inc |
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MPC8275ZQ Datasheet(HTML) 34 Page - Motorola, Inc |
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34 / 76 page  34 MPC8280 PowerQUICC II™ Family Hardware Specifications MOTOROLA Clock Configuration Modes 7.3 PCI Agent Mode Table 18 and Table 19 show configurations for PCI agent mode. The frequencies 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. In addition, note the following: NOTE: PCI_MODCK In PCI mode only, PCI_MODCK comes from the LGPL5 pin and MODCK_H[0–3] comes from {LGPL0, LGPL1, LGPL2, LGPL3}. NOTE: Tval (Output Hold) The minimum Tval = 2 when PCI_MODCK = 1, and the minimum Tval = 1 when PCI_MODCK = 0. Therefore, designers should use clock configurations that fit this condition to achieve PCI-compliant AC timing. 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 Table 14 shows, PCI_MODCK determines the PCI clock frequency range. Refer to Table 16 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 18. Clock Configurations for PCI Agent Mode (PCI_MODCK=0)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 66.7 66.7 2 133.3 133.3 2.5 166.7 166.7 2 66.7 66.7 0000_001 66.7 66.7 2 133.3 133.3 3 200.0 200.0 2 66.7 66.7 0000_010 55.5 66.7 3 166.7 200.0 3 166.7 200.0 3 55.5 66.7 0000_011 62.5 66.7 3 187.5 200.0 4 250.0 266.6 3 62.5 66.7 0000_100 50.0 66.7 3 150.0 200.0 3 180.0 240.0 2.5 60.0 80.0 0000_101 59.5 66.7 3 178.6 200.0 3.5 250.0 280.0 2.5 71.4 80.0 0000_110 53.6 66.7 4 214.3 266.6 3.5 250.0 311.1 3 71.4 88.9 0000_111 50.0 66.7 4 200.0 266.6 3 240.0 320.0 2.5 80.0 106.7 Full Configuration Modes 0001_001 Reserved |
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