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MPC972 Datasheet(PDF) 9 Page - Motorola, Inc |
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MPC972 Datasheet(HTML) 9 Page - Motorola, Inc |
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9 / 14 page  MPC972 MPC973 TIMING SOLUTIONS BR1333 — Rev 6 9 MOTOROLA ‘0’ MPC972 Figure 8. Programming Configuration Example fsela0 ‘0’ fsela1 fselb0 fselb1 Input Ref 50MHz fselc0 fselc1 fselFB0 fselFB1 fselFB2 VCO = 400MHz Ext_FB 100MHz Qa 40MHz Qb 66.66MHz Qc 4 4 4 50MHz QFB ‘1’ ‘1’ ‘0’ ‘1’ ‘0’ ‘1’ ‘0’ ‘0’ MPC972 Figure 9. Generating Pentium Clocks from Floppy Clock fsela0 ‘0’ fsela1 fselb0 fselb1 Input Ref 24MHz fselc0 fselc1 fselFB0 fselFB1 fselFB2 Ext_FB 60MHz (Processor) Qa 60MHz (Processor) Qb 30MHz (PCI) Qc 4 4 4 24MHz (Floppy Disk Clk) QFB ‘0’ ‘0’ ‘1’ ‘1’ ‘1’ ‘1’ ‘0’ ‘1’ MPC972 Figure 10. Generating MPC604 Clocks from Ethernet Clocks fsela0 ‘1’ fsela1 fselb0 fselb1 Input Ref 20MHz fselc0 fselc1 fselFB0 fselFB1 fselFB2 Ext_FB 33MHz (PCI) Qa 50MHz (Processor) Qb 50MHz (Processor) Qc 4 4 4 20MHz (Ethernet) QFB ‘0’ ‘1’ ‘1’ ‘1’ ‘1’ ‘1’ ‘1’ Figure 11. Phase Delay Using Multiple MPC972/973’s ‘0’ MPC972/973 fsela0 ‘0’ fsela1 fselb0 fselb1 Input Ref 66MHz fselc0 fselc1 fselFB0 fselFB1 fselFB2 Ext_FB 66MHz Qa 66MHz Qb 66MHz Qc 4 4 2 QFB ‘0’ ‘0’ ‘0’ ‘1’ ‘0’ ‘1’ ‘0’ ‘1’ MPC972/973 fsela0 ‘0’ fsela1 fselb0 fselb1 Input Ref fselc0 fselc1 fselFB0 fselFB1 fselFB2 Ext_FB 33MHz Shifted 90 ° Qa 33MHz Shifted 90 ° Qb 33MHz Shifted 90 ° Qc 4 4 4 66MHz QFB ‘0’ ‘1’ ‘1’ ‘1’ ‘0’ ‘0’ ‘0’ Inv_Clk ‘1’ Inv_Clk ‘0’ 66MHz Qc 2 66MHz 33MHz Shifted 90 ° 66MHz |
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