CS47L85 datasheet(203/370 Pages) CIRRUS

203 / 370 page

CS47L85

Rev 4.3

203

CLOCK GEAR

DESCRIPTION

SLIMCLK FREQUENCY

(

assuming 24.576MHz Root Frequency)

Divide by 1

24.576MHz

Divide by 2

12.288MHz

Divide by 4

6.144MHz

Divide by 8

3.072MHz

Divide by 16

1.536MHz

Divide by 32

768kHz

Divide by 64

384kHz

Divide by 128

192kHz

Divide by 256

96kHz

Divide by 512

48kHz

Table 68 SLIMbus Clock Gear Selection

When the CS47L85 is the active Framer, the SLIMCLK output is synchronised to the SYSCLK or ASYNCCLK system clock,

as selected by the SLIMCLK_SRC register bit.

The applicable system clock must be enabled, and configured at the SLIMbus Root Frequency, whenever the CS47L85 is

the active Framer. The system clock must not be interrupted or reconfigured if the CS47L85 is the active Framer. See

“Clocking and Sample Rates” for details of the SYSCLK and ASYNCCLK system clocks.

When the CS47L85 is not configured as the active Framer device, then the SLIMCLK input can be used to provide a

reference source for the Frequency Locked Loops (FLLs). The frequency of this reference is controlled using the

SLIMCLK_REF_GEAR register, as described in Table 69.

The SLIMbus clock reference is generated using an adaptive divider on the SLIMCLK input. The divider automatically adapts

to the SLIMbus Clock Gear (CG).

Note that, if the Clock Gear (CG) on the bus is lower than the SLIMCLK_REF_GEAR, then the selected reference frequency

cannot be supported, and the SLIMbus clock reference is disabled.

The SLIMbus

clock reference is selected as input to the FLLs using the FLLn_REFCLK_SRC registers. See “Clocking and

Sample Rates

” for details of system clocking and the FLLs.

ADDRESS

BIT

LABEL

DEFAULT

DESCRIPTION

R1507

(05E3h)

SLIMbus_

Framer_R

ef_Gear

SLIMCLK_SRC

SLIMbus Clock source

Selects the SLIMbus reference clock in

Active Framer mode.

0 = SYSCLK

1 = ASYNCCLK

Note that the applicable clock must be

enabled, and configured at the SLIMbus

Root Frequency, in Active Framer mode.

3:0

SLIMCLK_REF_

GEAR [3:0]

SLIMbus Clock Reference control.

Sets the SLIMbus reference clock relative

to the SLIMbus Root Frequency (RF).

0h = Clock stopped

1h = Gear 1 (RF / 512)

2h = Gear 2 (RF / 256)

3h = Gear 3 (RF / 128)

4h = Gear 4 (RF / 64)

5h = Gear 5 (RF / 32)

6h = Gear 6 (RF / 16)

7h = Gear 7 (RF / 8)

8h = Gear 8 (RF / 4)

9h = Gear 9 (RF / 2)

Ah = Gear 10 (RF)

All other codes are Reserved

Table 69 SLIMbus Clock Reference Control

CS47L85 Datasheet(PDF) 203 Page - Cirrus Logic

CS47L85 Datasheet(HTML) 203 Page - Cirrus Logic

Html Pages

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 ...More

Datasheet Download

Link URL