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Zakładka z wyszukiwarką danych komponentów |
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Zakładka z wyszukiwarką danych komponentów |
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MPC8250VR Arkusz danych(PDF) 27 Page - Freescale Semiconductor, Inc |
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MPC8250VR Arkusz danych(HTML) 27 Page - Freescale Semiconductor, Inc |
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27 / 60 page  MPC8250 Hardware Specifications, Rev. 1 Freescale Semiconductor 27 Clock Configuration Modes Table 18 describes all possible clock configurations when using the MPC8250’s internal PCI bridge in agent mode. 100 66/33 MHz 3/6 200 MHz 3 240 MHz 2.5 80 MHz 101 66/33 MHz 3/6 200 MHz 3.5 280 MHz 2.5 80 MHz 110 66/33 MHz 4/8 266 MHz 3.5 300 MHz 3 88 MHz 111 66/33 MHz 4/8 266 MHz 3 300 MHz 2.5 100 MHz 1 Assumes MODCK_HI = 0000. 2 The frequency depends on the value of PCI_MODCK. If PCI_MODCK is high (logic ‘1’), the PCI frequency is divided by 2 (33 instead of 66 MHz, etc.) and the CPM multiplication factor is multiplied by 2. Refer to Table 12 3 Core frequency = (60x bus frequency)(core multiplication factor) 4 Bus frequency = CPM frequency / bus division factor Table 18. Clock Configuration Modes in PCI Agent Mode MODCK_H – MODCK[1– 3] Input Clock Frequency (PCI) 1, 2 CPM Multiplication Factor1 CPM Frequency Core Multiplication Factor Core Frequency3 Bus Division Factor 60x Bus Frequency4 0001_001 66/33 MHz 2/4 133 MHz 5 166 MHz 4 33 MHz 0001_010 66/33 MHz 2/4 133 MHz 6 200 MHz 4 33 MHz 0001_011 66/33 MHz 2/4 133 MHz 7 233 MHz 4 33 MHz 0001_100 66/33 MHz 2/4 133 MHz 8 266 MHz 4 33 MHz 0010_001 50/25 MHz 3/6 150 MHz 3 180 MHz 2.5 60 MHz 0010_010 50/25 MHz 3/6 150 MHz 3.5 210 MHz 2.5 60 MHz 0010_011 50/25 MHz 3/6 150 MHz 4 240 MHz 2.5 60 MHz 0010_100 50/25 MHz 3/6 150 MHz 4.5 270 MHz 2.5 60 MHz 0011_000 66/33 MHz 2/4 133 MHz 2.5 110MHz 3 44 MHz 0011_001 66/33 MHz 2/4 133 MHz 3 132 MHz 3 44 MHz 0011_010 66/33 MHz 2/4 133 MHz 3.5 154 MHz 3 44 MHz 0011_011 66/33 MHz 2/4 133 MHz 4 176MHz 3 44 MHz 0011_100 66/33 MHz 2/4 133 MHz 4.5 198 MHz 3 44 MHz 0100_000 66/33 MHz 3/6 200 MHz 2.5 166 MHz 3 66 MHz 0100_001 66/33 MHz 3/6 200 MHz 3 200 MHz 366 MHz 0100_010 66/33 MHz 3/6 200 MHz 3.5 233 MHz 366 MHz Table 17. Clock Default Configurations in PCI Agent Mode (MODCK_HI = 0000) MODCK[1–3]1 Input Clock Frequency (PCI)2 CPM Multiplication Factor 2 CPM Frequency Core Multiplication Factor Core Frequency 3 Bus Division Factor 60x Bus Frequency4 |
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