ADE3000SX datasheet(14/88 Pages) STMICROELECTRONICS

14 / 88 page

Global Control Block

ADE3XXX

14/88

MD = INT(fXCLK x (2

(6 + NDIV - SDIV)) / f

OUT)

PE = INT((215) x (MD + 1 - fXCLK x (2

(6 + NDIV - SDIV)) / f

OUT))

where fXCLK is the external crystal frequency in MHz (typically 27). The maximum SCLK frequency

generated by this block is fXTAL x 2

(2+NDIV).

For lower power operation, set all clock sources to the “zero” setting and also set the analog power

disables. In this condition, only the crystal clock domain (XCLK) runs and blocks in INCLK or

DOTCLK domains are not accessible by I2C.

To detect a DVI plug event and wake from a low power state, program the DVI detection clock

source select to the DVI detect clock and enable the analog power control for the DVI detect clock.

All other clock sources are set to zero.

fOUT < fXCLK AND fOUT ≥ fXCLK /2

fOUT < fXCLK/2 AND fOUT ≥ fXCLK /4

fOUT < fXCLK/4 AND fOUT ≥ fXCLK /8

fOUT < fXCLK/8 AND fOUT ≥ fXCLK /16

fOUT < fXCLK/16 AND fOUT ≥ fXCLK /32

Table 4: Global Registers (Sheet 1 of 4)

Addr.

Mode

Bits

Default

Description

GLBL_NULL_ADDR

0x0000

R/W

[7:0]

0x0

Chip Revision ID

GLBL_CLK_SRC_SEL_0

0x0001

[7]

0x0

Reserved

R/W

[6:4]

0x5

DOTCLK source

0x0: YUVCLK pin

0x1: SCLK freq synth

0x2: FM freq synth (normal)

0x3: INCLK

0x4: CLKIN pin

0x5: crystal clock

0x6: 0

0x7: Reserved

R/W

[3:0]

0xA

INCLK source

0x0: YUVCLK pin (YUV Input)

0x1: DVI_PLLCLK (DVI Input)

0x2: ADCclock red

0x3: ADCclock green

0x4: ADC clock blue

0x5: SCLK freq synth

0x6: DVI detect clock

0x7: LLK PLL (ADC Input)

0x8: CLKIN pin

0x9: FM freq synth

0xA: crystal clock

0xB: 0

0xC - 0xF: Reserved

Table 3: SCLK Frequency Ranges (Continued)

Frequency Range

SDIV

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