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CDCE949

CDCEL949

SCAS844 – JUNE 2007

Table 11. PLL2 Configuration Register

OFFSET(1)

Bit(2)

Acronym

Default(3)

DESCRIPTION

20h

7:5

SSC2_7 [2:0]

000b

SSC2: PLL2 SSC Selection (Modulation Amount)(4)

4:2

SSC2_6 [2:0]

000b

Down

Center

000 (off)

1:0

SSC2_5 [2:1]

001 – 0.25%

001

± 0.25%

000b

010 – 0.5%

010

± 0.5%

21h

SSC2_5 [0]

011 – 0.75%

011

± 0.75%

6:4

SSC2_4 [2:0]

000b

100 – 1.0%

100

± 1.0%

101 – 1.25%

101

± 1.25%

3:1

SSC2_3 [2:0]

000b

110 – 1.5%

110

± 1.5%

SSC2_2 [2]

111 – 2.0%

111

± 2.0%

000b

22h

7:6

SSC2_2 [1:0]

5:3

SSC2_1 [2:0]

000b

2:0

SSC2_0 [2:0]

000b

23h

FS2_7

FS2_x: PLL2 Frequency Selection(4)

FS2_6

0 – fVCO2_0 (predefined by PLL2_0 – Multiplier/Divider value)

1 – fVCO2_1 (predefined by PLL2_1 – Multiplier/Divider value)

FS2_5

FS2_4

FS2_3

FS2_2

FS2_1

FS2_0

24h

PLL2 Multiplexer:

0 – PLL2

MUX2

1 – PLL2 Bypass (PLL2 is in power down)

Output Y4 Multiplexer:

0 – Pdiv2

1 – Pdiv4

Output Y5 Multiplexer:

00 – Pdiv2-Divider

01 – Pdiv4-Divider

5:4

10b

10 – Pdiv5-Divider

11 – reserved

3:2

Y4Y5_ST1

11b

Y4,

00 – Y4/Y5 disabled to 3-State (PLL2 is in power down)

Y5-State0/1definition:

01 – Y4/Y5 disabled to 3-State (PLL2 on)

10–Y4/Y5 disabled to low (PLL2 on)

1:0

Y4Y5_ST0

01b

11 – Y4/Y5 enabled (normal operation, PLL2 on)

25h

Y4Y5_7

Y4Y5_x Output State Selection(4)

Y4Y5_6

0 – state0 (predefined by Y4Y5_ST0)

1 – state1 (predefined by Y4Y5_ST1)

Y4Y5_5

Y4Y5_4

Y4Y5_3

Y4Y5_2

Y4Y5_1

Y4Y5_0

26h

PLL2 SSC down/center selection:

0 – down

SSC2DC

1 – center

7-Bit Y4-Output-Divider Pdiv4:

0 – reset and stand-by

6:0

Pdiv4

01h

1-to-127 – divider value

27h

—

Reserved – do not write others than 0

7-Bit Y5-Output-Divider Pdiv5:

0 – reset and stand-by

6:0

Pdiv5

01h

1-to-127 – divider value

(1)

Writing data beyond 50h may adversely affect device function.

(2)

All data is transferred MSB-first.

(3)

Unless a custom setting is used

(4)

The user can pre-define up to eight different control settings. In normal device operation, these settings can be selected by the external

control pins, S0, S1, and S2.

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