48SWTQFN-EP datasheet(69/103 Pages) MAXIM

69 / 103 page

MAX9288/MAX9290

3.12Gbps GMSL Deserializers

for Coax or STP Input and MIPI CSI-2 Output

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Maxim Integrated │ 69

Cable Type Configuration Input

CX/TP determine the power-up state of the serial input.

In coax mode, CX/TP also determine which coax input is

active, along with the default device address (Table 12).

Color Lookup Tables

The deserializer includes three color lookup tables (LUT)

to support automatic translation of pixel values. The LUT

can be used for RGB666, RGB888, and user-defined

generic 8-bit CSI-2 outputs. This feature can be used for

color gamma correction, brightness/contrast or for other

purposes. There are three lookup tables, each 8 bits wide

and 256 entries deep, enabling a 1-to-1 translation of 8-bit

input values to any 8-bit output value for each color (24

bits total).

Programming and Verifying LUT Data

The µC must set the LUTPROG register bit to 1 before

programming and verifying the tables. To program a LUT,

the µC generates a write packet with register address set

to the assigned register address for respective LUT (0x7D,

0x7E, or 0x7F). The deserializer writes data in the packet

to the respective LUT starting from the LUT address

location set in the LUTADDR register. Successive bytes

in the data packet are written to the next LUT address

location; however, each new data-packet write starts from

the address location stored in the LUTADDR register.

Use 0x00 for LUTADDR and 0x00 as the number of bytes

field in UART packet, when writing a 256-byte data block,

because 8-bit-wide number of bytes field cannot normally

represent 9-bit wide “256” value. There is no number of

bytes field in I2C-to-I2C modes.

To read back the contents of an LUT, the µC generates

a read packet with register address set to the assigned

0x7F). The deserializer outputs read data from the

respective LUTstarting from the LUTaddress location set in

the LUT_ADDR register. Similar to the write operation,

use 0x00 for LUTADDR and 0x00 as the number of bytes

field in UART packet, when reading a 256-byte data block.

LUT Color Translation

After power-up or going out of sleep or power-down

modes, LUT translation is disabled and LUT contents

are unknown. After program and verify operations are

finished, in order to enable LUT translations, set the

LUTPROG bit to 0 and set the respective LUT enable bits

(RED_LUT_EN, GRN_LUT_EN, BLU_LUT_EN) to 1 to

enable the desired LUT translation function. Only the

selected colors are translated by the LUT (the other

colors are not touched). The µC does not need to fill in all

three color lookup tables if all three color translations are

not needed.

After a pixel is deserialized, decoded, and decrypted (if

necessary), it is segmented into its color components red,

green, and blue (RGB) according to Table 13 and Figure

56. If LUT translation is enabled, each 8-bit pretranslation

color value is used as address to the respective LUT table

to look up the corresponding (translated) 8-bit color value.

Table 13. Pixel Data Format

Table 12. Configuration Input Map

CX/TP

FUNCTION

High

Coax+ input. 7-bit device address is XXXXXX0 (bin).

Mid

Coax- input. 7-bit device address is XXXXXX1 (bin).

Low

Twisted-pair input. 7-bit device address is

XXXXXX0 (bin).

DOUT

[5:0]

DOUT

[11:6]

DOUT

[17:12]

DOUT18

DOUT19

DOUT20

DOUT

[22:21]

DOUT

[24:23]

DOUT

[26:25]

R[5:0]

G[5:0]

B[5:0]

R[7:6]

G[7:6]

B[7:6]

48SWTQFN-EP Datasheet(PDF) 69 Page - Maxim Integrated Products

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