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MPC8275ZUE Datasheet(PDF) 28 Page - Freescale Semiconductor, Inc |
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MPC8275ZUE Datasheet(HTML) 28 Page - Freescale Semiconductor, Inc |
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28 / 80 page  MPC8280 PowerQUICC II™ Family Hardware Specifications, Rev. 1.7 28 Freescale Semiconductor Clock Configuration Modes 7.2 PCI Host Mode Table 17 and Table 18 show clock configurations for PCI host 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 ns when PCI_MODCK = 1, and the minimum Tval = 1 ns when PCI_MODCK = 0. Therefore, designers should use clock configurations that fit this condition to achieve PCI-compliant AC timing. Table 17. Clock Configurations for PCI Host Mode (PCI_MODCK=0) 1, 2 Mode 3 Bus Clock 4 (MHz) CPM Multiplication Factor 5 CPM Clock (MHz) CPU Multiplication Factor 6 CPU Clock (MHz) PCI Division Factor PCI Clock (MHz) MODCK_H- MODCK[1-3] Low High Low High Low High Low High Default Modes (MODCK_H=0000) 0000_000 60.0 66.7 2 120.0 133.3 2.5 150.0 166.7 2 60.0 66.7 0000_001 50.0 66.7 2 100.0 133.3 3 150.0 200.0 2 50.0 66.7 0000_010 60.0 80.0 2.5 150.0 200.0 3 180.0 240.0 3 50.0 66.7 0000_011 60.0 80.0 2.5 150.0 200.0 3.5 210.0 280.0 3 50.0 66.7 0000_100 60.0 80.0 2.5 150.0 200.0 4 240.0 320.0 3 50.0 66.7 0000_101 50.0 66.7 3 150.0 200.0 3 150.0 200.0 3 50.0 66.7 0000_110 50.0 66.7 3.5 150.0 200.0 3.5 175.0 233.3 3 50.0 66.7 0000_111 50.0 66.7 3 150.0 200.0 4 200.0 266.6 3 50.0 66.7 Full Configuration Modes 0001_000 50.0 66.7 3 150.0 200.0 5 250.0 333.3 3 50.0 66.7 0001_001 50.0 66.7 3 150.0 200.0 6 300.0 400.0 3 50.0 66.7 0001_010 50.0 66.7 3 150.0 200.0 7 350.0 466.6 3 50.0 66.7 0001_011 50.0 66.7 3 150.0 200.0 8 400.0 533.3 3 50.0 66.7 0010_000 50.0 66.7 4 200.0 266.6 5 250.0 333.3 4 50.0 66.7 0010_001 50.0 66.7 4 200.0 266.6 6 300.0 400.0 4 50.0 66.7 0010_010 50.0 66.7 4 200.0 266.6 7 350.0 466.6 4 50.0 66.7 0010_011 50.0 66.7 4 200.0 266.6 8 400.0 533.3 4 50.0 66.7 |
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