MPC972 Просмотр технического описания (PDF) - Motorola => Freescale

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Компоненты Описание

производитель

MPC972

LOW VOLTAGE PLL CLOCK DRIVER

Motorola => Freescale 

MPC972

MPC972

`0'

fsela0

`0'

fsela1

`1'

fselb0

`1'

fselb1

`0'

fselc0

`1'

fselc1

`0'

fselFB0

4

Qa

4

Qb

4

Qc

100 MHz

40 MHz

66.66 MHz

`1'

fselFB1

`0'

fselFB2

QFB

50 MHz

50 MHz

Input Ref

Ext_FB

VCO = 400 MHz

Figure 6. Programming Configuration Example

MPC972

`0'

fsela0

`0'

fsela1

`0'

fselb0

`0'

fselb1

`1'

fselc0

`1'

fselc1

`1'

fselFB0

4

Qa

4

Qb

4

Qc

60 MHz (Processor)

60 MHz (Processor)

30 MHz (PCI)

`1'

fselFB1

`0'

fselFB2

QFB

24 MHz (Floppy Disk Clk)

24 MHz

Input Ref

Ext_FB

Figure 7. Generating Pentium Clocks from Floppy Clock

MPC972

`1'

fsela0

`1'

fsela1

`0'

fselb0

`1'

fselb1

`1'

fselc0

`1'

fselc1

`1'

fselFB0

4

Qa

4

Qb

4

Qc

33 MHz (PCI)

50 MHz (Processor)

50 MHz (Processor)

`1'

fselFB1

`1'

fselFB2

QFB

20 MHz (Ethernet)

20 MHz

Input Ref

Ext_FB

Figure 8. Generating MPC604 Clocks from Ethernet Clocks

MPC972

`0'

fsela0

`0'

fsela1

`0'

fselb0

`0'

fselb1

`1'

fselc0

`0'

fselc1

`0'

fselFB0

`0'

fselFB1

`0'

fselFB2

4

Qa

4

Qb

2

Qc

2

Qc

`1'

Inv_Clk

QFB

66 MHz

Input Ref

Ext_FB

`0'

66 MHz `1'

`0'

66 MHz `1'

`1'

66 MHz `1'

`0'

66 MHz `0'

`0'

`0'

fsela0

fsela1

fselb0

fselb1

fselc0

fselc1

fselFB0

fselFB1

fselFB2

Inv_Clk

MPC972

Input Ref

Ext_FB

4

Qa

4

Qb

4

Qc

QFB

33 MHz Shifted 90°

33 MHz Shifted 90°

33 MHz Shifted 90°

66 MHz

66 MHz

66 MHz

33 MHz

Shifted 90°

Figure 9. Phase Delay Using Multiple MPC972’s

8

MOTOROLA

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