CS42418 datasheet(39/67 Pages) CIRRUS

39 / 67 page

CS42418

5.8

OMCK/PLL_CLK Ratio (address 07h) (Read Only)

5.8.1

OMCK/PLL_CLK RATIO (RATIOX)

Default = sixth

Function:

This register allows the user to find the exact absolute frequency of the recovered MCLK coming from

the PLL. This value is represented as an integer (RATIO7:6) and a fractional (RATIO5:0) part. For

example, an OMCK/PLL_CLK ratio of 1.5 would be displayed as 60h.

5.9

Clock Status (address 08h) (Read Only)

5.9.1

SYSTEM CLOCK SELECTION (ACTIVE_CLK)

Default = x

0 - Output of PLL

1 - OMCK

Function:

This bit identifies the source of the internal system clock (MCLK).

5.9.2

PLL CLOCK FREQUENCY (PLL_CLKX)

Default = xxxh

Function:

The CS42418 will auto-detect the ratio between the OMCK and the recovered clock from the PLL,

which is displayed in register 07h. Based on this ratio, the absolute frequency of the PLL clock can

be determined, and this information is displayed according to the following table. If the absolute fre-

quency of the PLL clock does not match one of the given frequencies, this register will display the

closest available value.

NOTE: These bits are set to ‘111’b when the FRC_PLL_LK bit is ‘1’b.

76543

210

RATIO7(21)RATIO6(20)RATIO5(2-1)RATIO4(2-2)RATIO3(2-3)RATIO2(2-4)RATIO1(2-5)RATIO0(2-6)

76543

210

Reserved

Active_CLK

PLL_CLK2

PLL_CLK1

PLL_CLK0

PLL_CLK2

PLL_CLK1

PLL_CLK0

Description

8.1920 MHz

11.2896 MHz

12.288 MHz

16.3840 MHz

22.5792 MHz

24.5760 MHz

45.1584 MHz

49.1520 MHz

Table 13. PLL Clock Frequency Detection

CS42418 数据表(PDF) 39 Page - Cirrus Logic

CS42418 数据表(HTML) 39 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

数据表下载

链接网址

CS42418 数据表(PDF) 39 Page - Cirrus Logic

CS42418 数据表(HTML) 39 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

数据表 下载

链接网址

数据表下载