48SWTQFN-EP datasheet(79/103 Pages) MAXIM

79 / 103 page

MAX9288/MAX9290

3.12Gbps GMSL Deserializers

for Coax or STP Input and MIPI CSI-2 Output

www.maximintegrated.com

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Table 20. HDCP Authentication and Normal Operation (One Repeater, Two µCs)—First

and Second Parts of the HDCP Authentication Protocol

NO.

µC_B

µC_R

HDCP GMSL

SERIALIZER

(TX_B1, TX_R1,

TX_R2)

HDCP GMSL

DESERIALIZER

(RX_R1, RX_D1,

RX_D2)

TX_B1 CDS = 0

TX_R1 CDS = 0

TX_R2 CDS = 0

RX_R1 CDS = 1

RX_D1 CDS = 0

RX_D2 CDS = 0

Initial state after power-up.

All: Power-up waiting for

HDCP authentication.

All: Power-up waiting for

HDCP authentication.

—

Writes REPEATER = 1 in

RX_R1. Retries until proper

acknowledge frame received.

Note: This step must be

completed before the first part

of authentication is started

between TX_B1 and RX_R1 by

the µC_B (step 7). For example,

to satisfy this requirement,

RX_R1 can be held at power-

down until µC_R is ready to

write the REPEATER bit, or

µC_B can poll µC_R before

starting authentication.

—

Makes sure that A/V data

not requiring protection (low-

value content) is available at

the TX_B1 inputs (such as

blue or informative screen).

Alternatively, the FORCE_

VIDEO and FORCE_AUDIO

bits of TX_B1 can be used to

mask A/V data input of TX_B1.

Starts the link between TX_B1

and RX_R1 by writing SEREN

= H to TX_B1, or link starts

automatically if serializer’s

AUTOS

is low.

—

TX_B1: Starts

serialization and

transmits low-value

content A/V data.

RX_R1: Locks to

incoming data stream

and outputs low-value

content A/V data.

—

Starts all downstream links

by writing SEREN = H to

TX_R1, TX_R2, or links start

automatically if AUTOS of

transmitters are low.

TX_R1, TX_R2: Starts

serialization and

transmits low-value

content A/V data.

RX_D1, RX_D2: Locks

to incoming data stream

and outputs low-value

content A/V data.

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