MPC970

MOTOROLA

TIMING SOLUTIONS

BR1333 — Rev 6

10

Table 2. Programmable Output Frequency Relationships (MPC601_Clks = ‘LOW’; VCO_Sel = ‘HIGH’)

INPUTS

OUTPUTS

PCI_Div1

PCI_Div0

BCLK_Div1

BCLK_Div0

2x_PCLK

PCLKEN

BCLKEN*

BCLK

PCI_CLK

0

0

0

0

VCO/4

VCO/4

VCO/4

VCO/4

VCO/4

0

0

0

1

VCO/4

VCO/4

VCO/4

VCO/8

VCO/8

0

0

1

0

VCO/4

VCO/4

VCO/4

VCO/12

VCO/12

0

0

1

1

VCO/4

VCO/4

VCO/4

VCO/16

VCO/16

0

1

0

0

VCO/4

VCO/4

VCO/4

VCO/4

VCO/8

0

1

0

1

VCO/4

VCO/4

VCO/4

VCO/8

VCO/16

0

1

1

0

VCO/4

VCO/4

VCO/4

VCO/12

VCO/24

0

1

1

1

VCO/4

VCO/4

VCO/4

VCO/16

VCO/32

1

0

0

0

VCO/4

VCO/4

VCO/4

VCO/4

VCO/12

1

0

0

1

VCO/4

VCO/4

VCO/4

VCO/8

VCO/24

1

0

1

0

VCO/4

VCO/4

VCO/4

VCO/12

VCO/36

1

0

1

1

VCO/4

VCO/4

VCO/4

VCO/16

VCO/48

1

1

0

0

VCO/4

VCO/4

VCO/4

VCO/4

VCO/4

1

1

0

1

VCO/4

VCO/4

VCO/4

VCO/8

VCO/4

1

1

1

0

VCO/4

VCO/4

VCO/4

VCO/12

VCO/4

1

1

1

1

VCO/4

VCO/4

VCO/4

VCO/16

VCO/4

* BCLK_En output is coincident with other outputs

MPC970

Figure 4. External Feedback Configuration 1

Bclk_Div0

“LO”

Bclk_Div1

“LO”

PCI_Div0

“LO”

PCI_Div1

“LO”

MPC601_Clks

“LO”

VCO_Sel

“LO”

xtal1

xtal2

TClk

(VCO/8)

Ref_Sel

“LO”

IntFB_Sel

“LO”

Ext_FB

(VCO/8)

2x_PCLK

(VCO/8)

PCLKEN

(VCO/8)

BCLKEN

(VCO/8)

BCLK0:4

(VCO/8)

PCI_CLK0:6

400

≤ VCO ≤ 1000

MPC970

Figure 5. External Feedback Configuration 2

Bclk_Div0

“LO”

Bclk_Div1

“LO”

PCI_Div0

“HI”

PCI_Div1

“LO”

MPC601_Clks

“LO”

VCO_Sel

“HI”

xtal1

xtal2

TClk

(VCO/8)

Ref_Sel

“LO”

IntFB_Sel

“LO”

Ext_FB

(VCO/4)

2x_PCLK

(VCO/4)

PCLKEN

(VCO/4)

BCLKEN

(VCO/4)

BCLK0:4

(VCO/8)

PCI_CLK0:6

400

≤ VCO ≤ 1000

MPC970

Figure 6. External Feedback Configuration 3

Bclk_Div0

“LO”

Bclk_Div1

“LO”

PCI_Div0

“LO”

PCI_Div1

“HI”

MPC601_Clks

“LO”

VCO_Sel

“HI”

xtal1

xtal2

TClk

(VCO/12)

Ref_Sel

“LO”

IntFB_Sel

“LO”

Ext_FB

(VCO/4)

2x_PCLK

(VCO/4)

PCLKEN

(VCO/4)

BCLKEN

(VCO/4)

BCLK0:4

(VCO/12)

PCI_CLK0:6

400

≤ VCO ≤ 1000

MPC970

Figure 7. External Feedback Configuration 4

Bclk_Div0

“HI”

Bclk_Div1

“LO”

PCI_Div0

“HI”

PCI_Div1

“LO”

MPC601_Clks

“LO”

VCO_Sel

“HI”

xtal1

xtal2

TClk

(VCO/16)

Ref_Sel

“LO”

IntFB_Sel

“LO”

Ext_FB

(VCO/4)

2x_PCLK

(VCO/4)

PCLKEN

(VCO/4)

BCLKEN

(VCO/8)

BCLK0:4

(VCO/16)

PCI_CLK0:6

400

≤ VCO ≤ 1000