48SWTQFN-EP datasheet(67/103 Pages) MAXIM

67 / 103 page

MAX9288/MAX9290

3.12Gbps GMSL Deserializers

for Coax or STP Input and MIPI CSI-2 Output

www.maximintegrated.com

Maxim Integrated │ 67

I2C Address Translation

The deserializers support I2C address translation for up to

two device addresses. Use address translation to assign

unique device addresses to peripherals with limited

I2C addresses. Source addresses (address to translate

from) are stored in registers 0x18 and 0x1A. Destination

addresses (address to translate to) are stored in registers

0x19 and 0x1B.

In a multilink situation where there are multiple deserial-

izers and/or peripheral devices connected to these serial-

izers, the deserializers support broadcast commands to

control these multiple devices. Select an unused device

address to use as a broadcast device address. Program

all the remote-side serializer devices to translate the

broadcast device address (source address stored in reg-

isters 0x0F, 0x11) to the peripherals’ address (destination

address stored in registers 0x10, 0x12). Any commands

sent to the broadcast address (selected unused address)

are sent to all deserializers and/or peripheral devices con-

nected to the deserializers whose addresses match the

translated broadcast address.

GPO/GPI Control

GPO on the serializer follows GPI transitions on the dese-

rializer. This GPO/GPI function can be used to transmit

signals such as a frame sync in a surround-view camera

system. The GPI-to-GPO delay is 0.35ms max. Keep

time between GPI transitions to a minimum 0.35ms. This

includes transitions from the other deserializer in coax

splitter mode. Bit D4 of register 0x06 in the deserializer

stores the GPI input state. GPO is low after power-up.

The µC can set GPO by writing to the SETGPO register

bit. Do not send a logic-low value on the deserializer

RX/SDA input (UART mode) longer than 100µs in

either base or bypass mode to ensure proper GPO/GPI

functionality. GPO/GPI commands will override and cor-

rupt an I2C/UART command in progress.

Line Equalizer

The deserializer includes an adjustable line equalizer to

further compensate cable attenuation at high frequencies.

The cable equalizer has 11 selectable levels of compen-

sation from 2.1dB to 13dB (Table 11). To select other

equalization levels, set the corresponding register bits

in the deserializer (0x05 D[3:0]). Use equalization in the

deserializer, together with preemphasis in the serializer, to

create the most reliable link for a given cable.

HS/VS/DE Tracking

The deserializer has tracking to filter out HS/VS/DE bit or

packet errors. HS/VS/DE tracking is on by default when

the device is in high-bandwidth mode (BWS = open),

and off by default when in 24-bit or 32-bit mode (BWS =

low or high). Set/clear HVTREN (D6 of register 0x15) to

enable/disable HS/VS tracking. Set/clear DETREN (D5 of

the device uses a partial and full periodic tracking of

HS/DE. Set HVTRMODE = 0 (D4 of register 0x15) to

disable full periodic tracking. HS/VS/DE tracking can be

turned on in 24-bit and 32-bit modes to track and correct

against bit errors in HS/VS/DE link bits.

Serial Input

The device can receive serial data from two kinds of

cable: 100Ω twisted pair and 50Ω coax. (Contact the

factory for devices compatible with 75Ω cables).

Table 11. Cable Equalizer Boost Levels

BOOST SETTING

(0x05 D[3:0])

TYPICAL BOOST GAIN (dB)

0000

2.1

0001

2.8

0010

3.4

0011

4.2

0100

5.2

Power-up default when

EQS is set high

0101

6.2

0110

0111

8.2

1000

9.4

1001

10.7

Power-up default when

EQS is set low

1010

11.7

1011

48SWTQFN-EP Datasheet(PDF) 67 Page - Maxim Integrated Products

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