CS47L85 datasheet(314/370 Pages) CIRRUS

314 / 370 page

CS47L85

314

Rev 4.3

ADDRESS

BIT

LABEL

DEFAULT

DESCRIPTION

R407

(0197h)

FLL2_Loo

p_Filter_T

est_1

FLL2_FRC_INTE

G_UPD

Write ‘1’ to apply the FLL2_FRC_INTEG_VAL setting.

(Only valid when FLL2_FREERUN=1)

11:0

FLL2_FRC_INTE

G_VAL [11:0]

000h

FLL2 Forced Integrator Value

R408

(0198h)

FLL2_NC

O_Test_0

FLL2_INTEG_VA

LID

FLL2 Integrator Valid

Indicates if the FLL2_INTEG register is valid

0 = Not valid

1 = Valid

11:0

FLL2_INTEG

[11:0]

000h

FLL2 Integrator Value

(Read-only)

Indicates the current FLL2 integrator setting. Only valid

when FLL2_INTEG_VALID = 1.

R433

(01B1h)

FLL3_Con

trol_1

FLL3_FREERUN

FLL3 Free-Running Mode Enable

0 = Disabled

1 = Enabled

The FLL feedback mechanism is halted in Free-Running

mode, and the latest integrator setting is maintained

R439

(01B7h)

FLL3_Loo

p_Filter_T

est_1

FLL3_FRC_INTE

G_UPD

Write ‘1’ to apply the FLL3_FRC_INTEG_VAL setting.

(Only valid when FLL3_FREERUN=1)

11:0

FLL3_FRC_INTE

G_VAL [11:0]

000h

FLL3 Forced Integrator Value

R440

(01B8h)

FLL3_NC

O_Test_0

FLL3_INTEG_VA

LID

FLL3 Integrator Valid

Indicates if the FLL3_INTEG register is valid

0 = Not valid

1 = Valid

11:0

FLL3_INTEG

[11:0]

000h

FLL3 Integrator Value

(Read-only)

Indicates the current FLL3 integrator setting. Only valid

when FLL3_INTEG_VALID = 1.

Table 112 Free-Running FLL Mode Control

SPREAD SPECTRUM FLL CONTROL

The CS47L85 can apply modulation to the FLL outputs, using spread spectrum techniques. This can be used to control the

EMI characteristics of the circuits that are clocked via the FLLs.

Each of the FLLs can be individually configured for Triangle modulation, Zero Mean Frequency Modulation (ZMFM) or Dither.

The amplitude and frequency parameters of the spread spectrum functions is also programmable, using the registers

described in Table 113.

ADDRESS

BIT

LABEL

DEFAULT

DESCRIPTION

R393

(0189h)

FLL1_Spr

ead_Spect

rum

5:4

FLL1_SS_AMPL

[1:0]

FLL1 Spread Spectrum Amplitude

Controls the extent of the spread-spectrum modulation.

00 = 0.7% (triangle), 0.7% (ZMFM, dither)

01 = 1.1% (triangle), 1.3% (ZMFM, dither)

10 = 2.3% (triangle), 2.6% (ZMFM, dither)

11 = 4.6% (triangle), 5.2% (ZMFM, dither)

3:2

FLL1_SS_FREQ

[1:0]

FLL1 Spread Spectrum Frequency

Controls the spread spectrum modulation frequency in

Triangle mode.

00 = 439kHz

01 = 878kHz

10 = 1.17MHz

11 = 1.76MHz

CS47L85 Datasheet(PDF) 314 Page - Cirrus Logic

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