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поискавой системы для электроныых деталей |
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поискавой системы для электроныых деталей |
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MPC8250VR датащи(PDF) 26 Page - Freescale Semiconductor, Inc |
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MPC8250VR датащи(HTML) 26 Page - Freescale Semiconductor, Inc |
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26 / 60 page  MPC8250 Hardware Specifications, Rev. 1 26 Freescale Semiconductor Clock Configuration Modes 3.2.2 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. 1001_010 66 MHz 3.5 233 MHz 3.5 233 MHz 4/8 58/29 MHz 1001_011 66 MHz 3.5 233 MHz 4 266 MHz 4/8 58/29 MHz 1001_100 66 MHz 3.5 233 MHz 4.5 300 MHz 4/8 58/29 MHz 1010_000 100 MHz 2 200 MHz 2 200 MHz 3/6 66/33 MHz 1010_001 100 MHz 2 200 MHz 2.5 250 MHz 3/6 66/33 MHz 1010_010 100 MHz 2 200 MHz 3 300 MHz 3/6 66/33 MHz 1010_011 100 MHz 2 200 MHz 3.5 350 MHz 3/6 66/33 MHz 1010_100 100 MHz 2 200 MHz 4 400 MHz 3/6 66/33 MHz 1011_000 100 MHz 2.5 250 MHz 2 200 MHz 4/8 62/31 MHz 1011_001 100 MHz 2.5 250 MHz 2.5 250 MHz 4/8 62/31MHz 1011_010 100 MHz 2.5 250 MHz 3 300 MHz 4/8 62/31 MHz 1011_011 100 MHz 2.5 250 MHz 3.5 350 MHz 4/8 62/31 MHz 1011_100 100 MHz 2.5 250 MHz 4 400 MHz 4/8 62/31 MHz 1 Input clock frequency is given only for the purpose of reference. User should set MODCK_H–MODCK_L so that the resulting configuration does not exceed the frequency rating of the user’s part. 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.). Refer to Table 12 3 In this mode, PCI_MODCK must be “0”. 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 000 66/33 MHz 2/4 133 MHz 2.5 166 MHz 2 66 MHz 001 66/33 MHz 2/4 133 MHz 3 200 MHz 2 66 MHz 010 66/33 MHz 3/6 200 MHz 3 200 MHz 3 66 MHz 011 66/33 MHz 3/6 200 MHz 4 266 MHz 3 66 MHz Table 16. Clock Configuration Modes in PCI Host Mode (continued) MODCK_H – MODCK[1– 3] Input Clock Frequency 1 (Bus) CPM Multiplication Factor CPM Frequency Core Multiplication Factor Core Frequency PCI Division Factor 2 PCI Frequency2 |
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