COMPRO X800 - START UP GUIDE Especificaciones descargar pdf (Pagina 24)

24 _____________________________________________________________________________________

MAX9249

Gigabit Multimedia Serial Link

Serializer with LVDS System Interface

Both devices include a sawtooth divider to control the

spread-modulation rate. Autodetection or manual pro-

gramming of the RXCLKIN_ operation range guarantees

a spread-spectrum modulation frequency within 20kHz

to 40kHz. Additionally, manual configuration of the

sawtooth divider (SDIV, 0x03 D[5:0]) allows the user to

set a modulation frequency according to the RXCLKIN_

frequency. Always keep the modulation frequency

between 20kHz to 40kHz to ensure proper operation.

Manual Programming of the

Spread-Spectrum Divider

The modulation rate for the MAX9249 relates to the

RXCLKIN_ frequency as follows:

( )

RXCLKIN_

f 1 DRS

MOD SDIV

= +

where:

= Modulation frequency

DRS = DRS pin input value (0 or 1)

RXCLKIN_

= LVDS clock frequency

MOD = Modulation coefficient given in Table 7

SDIV = 6-bit SDIV setting, manually programmed

by the FC

To program the SDIV setting, first look up the modulation

coefficient according to the part number and desired

bus-width and spread-spectrum settings. Solve the above

equation for SDIV using the desired pixel clock and modu-

lation frequencies. If the calculated SDIV value is larger

than the maximum allowed SDIV value in Table 7, set SDIV

to the maximum value.

Sleep Mode

The MAX9249/GMSL deserializer include low-power

sleep mode to reduce power consumption on the device

not attached to the FC (the GMSL deserializer in LCD

applications and the MAX9249 in camera applications).

Set the corresponding remote IC’s SLEEP bit to 1 to initi-

ate sleep mode. The MAX9249 sleeps immediately after

Table 6. Spread-Spectrum Rate Limitations

Table 7. Modulation Coefficients and Maximum SDIV Settings

3-CHANNEL MODE

RXCLKIN_ FREQUENCY

(MHz)

4-CHANNEL MODE

RXCLKIN_ FREQUENCY

(MHz)

SERIAL LINK BIT RATE

(Mbps)

AVAILABLE SPREAD

RATES

< 33.3 < 25 < 1000 All rates available

33.3 to < 66.7 20 to < 50 1000 to < 2000 1.5%, 1.0%, 0.5%

≥ 66.7 ≥ 50 ≥ 2000 0.5%

BUS-WIDTH MODE

SPREAD-SPECTRUM

SETTING (%)

MODULATION COEFFICIENT

(DECIMAL)

SDIV UPPER LIMIT

(DECIMAL)

4-Channel

0.5 104 63

1 104 40

1.5 152 54

2 204 30

3 152 27

4 204 15

3-Channel

0.5 80 63

1 80 52

1.5 112 63

2 152 42

3 112 37

4 152 21

1 2 ... 19 20 21 22 23 24 25 26 27 28 29 ... 35 36

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