MAX96708 datasheet(26/68 Pages) MAXIM

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Detailed Description

The MAX96708 deserializer is a compact device with

features especially suited for automotive camera

applications. The device operates at a variety of output

widths and word rates up to a total serial-data rate up to

1.75Gbps. Two modes offer a 116MHz parallel clock rate

with 11 bits of video data or 87MHz parallel clock rate with

14 bits of video data. An embedded 9.6kbps to 1Mbps

control channel programs the serializer, deserializer, and

any attached UART or I2C peripherals.

To promote safety applications, the device features CRC

protection of video data. In addition, high-immunity mode

reduces the effects of bit errors corrupting communication.

Automatic equalization, along with a PRBS tester, allow

for in-system optimization of the link.

This device operates over the -40°C to +115°C automotive

temperature range.

Serial Link Signaling and Data Format

The serializer scrambles the input parallel data and

combines this with the forward control data. The data is

then encoded for transmission and output as a single

bitstream at several times the input word rate (depending

on bus width). The deserializer receives the serial data

and recovers the clock signal. The data is then deserial-

ized, decoded, and descrambled into parallel output data

and forward control data.

Operating Modes

The GMSL devices are configurable to operate in many

modes, depending on the application. These modes allow

for a more efficient use of serial bandwidth. Most of these

settings are set during system design and are configured

using the external configuration pins, or through register

bits.

Video/Configuration Link

In normal operation, the serializer runs in video-link mode

(SEREN = 1) with video data and control data sent across

the serial link. Set SEREN = 0 in the serializer to turn off

serialization. The serializer powers up in video-link mode,

and requires a valid PCLK for operation.

The configuration link is available to set up the serializer,

deserializer, and peripherals when PCLK is not available.

Set SEREN = 0 and CLINK = 1 in the serializer to enable

the configuration link (SEREN = 1 forces the serializer into

video-link mode). Once PCLK has been established, turn

on the video link (SEREN = 1).

By default, video-link mode requires a valid PCLK for

operation. Set AUTO_CLINK bit = 1 (if supported), and

SEREN = 1 in the serializer to automatically switch

between the video link and configuration link whenever

PCLK is not present.

Single and Double Modes of Operation

Single-/double-mode operation configures the available

1.74Gbps bandwidth into a variety of widths and word

rates. Single-mode operation is compatible with all GMSL

devices, and serializes one parallel word for each serial

word. Double mode serializes two half-width parallel

words for each serial word, and results in a 2x increase

in parallel word-rate range (compared to single mode).

Set DBL = 0 for single-mode operation and DBL = 1 for

double-mode operation.

HS/VS Encoding

By default, GMSL assigns a video bit slot to HSYNC,

VSYNC, and DE (if used). With HS/VS encoding, the

device instead encodes special packets to sync signals

to free up additional video bit slots. Set HVEN = 1 to turn

on HS/VS encoding (DE, if enabled uses up a video bit).

HS/VS encoding requires that HSYNC, VSYNC, and DE

(if used) remain high during the active video, and low

during the blanking period. Use HS/VS inversion when

using reverse-polarity sync signals.

Error Detection

The serial link's 8b/10b encoding/decoding, and 1-bit

parity detect bit errors that occur on the serial link. An

optional 6-bit CRC check is available at the expense of 6

video bits. To activate 6-bit CRC mode, set PXL_CRC = 1

in the remote-side device first, and then in the local-side

device. When using 6-bit CRC mode, the available inter-

nal bus width is reduced by 6 bits in single-input mode

(DBL = 0) and 3 bits in double-input mode (DBL = 1). Note

that the input bus width may already have been reduced

due to pin availability of the serializer or deserializer; thus,

the reduction of bandwidth from CRC may not be visible

(see Table 3).

www.maximintegrated.com

Maxim Integrated │ 26

MAX96708

14-Bit GMSL Deserializer

with Coax or STP Cable Input

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