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CDCE906

SCAS814H – NOVEMBER 2005 – REVISED DECEMBER 2007

SSC2

SSC1

SSC0

Function

0

0

0

Yes

0

0

1

SSC Modulation Amount ±0.1% (center spread)

0

1

0

SSC Modulation Amount ±0.25% (center spread)

0

1

1

SSC Modulation Amount ±0.4% (center spread)

1

0

0

SSC Modulation Amount 1% (down spread)

1

0

1

SSC Modulation Amount 1.5% (down spread)

1

1

0

SSC Modulation Amount 2% (down spread)

1

1

1

SSC Modulation Amount 3% (down spread)

(1)

The PLL has to be bypassed (turned off) when changing SSC Modulation Amount on-the-fly. This can be done by following

programming sequence: bypass PLL2 (Byte 3, Bit 6 = 1); write new Modulation Amount (Byte 25); re-activate PLL2 (Byte 3, Bit 6 = 0).

(2)

Unless customer specific setting.

(3)

If SSC bypass is selected, SSC circuitry of PLL2 is powered-down and the SSC output is reset to logic low. The non-SSC output of

PLL2 is not affected by this mode and can still be used.

Byte 25, Bit [7]: Permanently Lock EEPROM-Data

EELOCK

0

No

Yes

1

Yes

(1)

If this bit is set, the actual data in the EEPROM will be permanently locked. There is no further programming possible, even this bit is set

low. Data, however can still be written via SMBUS to the internal register to change device function on the fly. But new data no longer

can be stored into the EEPROM.

(2)

Unless customer specific setting.

BC6

BC5

BC4

BC3

BC2

BC1

BC0

No. of Bytes

0

0

0

0

0

0

0

Not allowed

0

0

0

0

0

0

1

1

0

0

0

0

0

1

0

2

0

0

0

0

0

1

1

3

•

•

•

0

0

1

1

0

1

1

27

Yes

•

•

•

1

1

1

1

1

0

1

125

1

1

1

1

1

1

0

126

1

1

1

1

1

1

1

127

(1)

Defines the number of Bytes, which will be sent from this device at the next Block Read protocol.

(2)

Unless customer specific setting.

EEWRITE

Starts EEPROM Write Cycle

0

No

Yes

1

Yes

(1)

The EEPROM WRITE cycle is initiated with the rising edge of the EEWRITE-Bit. A static level high does not trigger an EEPROM WRITE

cycle. This bit stays high until the user reset it to low (it will not automatically be reset after the programming has been completed).

Therefore, to initiate an EEPROM WRITE cycle, it is recommended to send a zero-one sequence to the EEWRITE bit in Byte 26.

During EEPROM programming, no data are allowed to be sent to the device via the SMBus until the programming sequence has been

completed. Data, however, can be readout during the programming sequence (Byte Read or Block Read). The programming status can

be monitored by readout EEPIP, Byte 24–Bit 7. If EELOCK is set, no EEPROM programming will be possible.

(2)

Unless customer specific setting.

20

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