48SWTQFN-EP datasheet(74/103 Pages) MAXIM

74 / 103 page

MAX9288/MAX9290

3.12Gbps GMSL Deserializers

for Coax or STP Input and MIPI CSI-2 Output

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If the total number of downstream receivers exceeds 14,

the µC must set the MAX_DEVS_EXCEEDED register bit

when it assembles the KSV list.

HDCP Authentication Procedures

The GMSL serializer generates a 64-bit random number

exceeding the HDCP requirement. The GMSL serial-

izer/deserializer internal one-time programmable (OTP)

memories contain a unique HDCP keyset programmed at

the factory. The host µC initiates and controls the HDCP

authentication procedure. The GMSL serializer and dese-

rializer generate HDCP authentication response values

for the verification of authentication. Use the following

procedures to authenticate the HDCP GMSL encryption

(refer to the HDCP 1.3 Amendment for GMSL for details).

The µC must perform link integrity checks while encryp-

tion is enabled (see Table 17). Any event that indicates

that the deserializer has lost link synchronization should

retrigger authentication. The µC must first write 1 to the

RESET_HDCP bit in the GMSL serializer before starting

a new authentication attempt.

HDCP Protocol Summary

Table 17, Table 18, and Table 19 list the summaries of the

HDCP protocol. These tables serve as an implementation

guide only. Meet the requirements in the GMSL amend-

ment for HDCP to be in full compliance.

Table 17. Startup, HDCP Authentication, and Normal Operation (Deserializer is Not a

Repeater)—First Part of the HDCP Authentication Protocol

NO.

µC

HDCP GMSL SERIALIZER

HDCP GMSL DESERIALIZER

Initial state after power-up.

Powers up waiting for HDCP

authentication.

Powers up waiting for HDCP

authentication.

Makes sure that A/V data not requiring

protection (low-value content) is available at

the GMSL serializer inputs (such as blue or

informative screen). Alternatively, uses the

FORCE_VIDEO and FORCE_AUDIO bits of

the GMSL serializer to mask A/V data at the

input of the GMSL serializer. Starts the link by

writing SEREN = H or link starts automatically

if AUTOS is low.

—

Starts serialization and transmits

low-value content A/V data.

Locks to incoming data stream and

outputs low-value content A/V data.

Reads the locked bit of the deserializer and

makes sure the link is established.

—

Optionally writes a random-number seed to

the GMSL serializer.

Combines seed with internally

generated random number. If

no seed provided, only internal

random number is used.

—

If HDCP encryption is required, starts

authentication by writing 1 to the

START_AUTHENTICATION bit of the GMSL

serializer.

Generates (stores) AN, and

resets the

START_AUTHENTICATION bit

to 0.

—

Reads AN and AKSV from the GMSL serializer

and writes to the deserializer.

—

Generates R0’ triggered by the µC’s

write of AKSV.

Reads the BKSV and REPEATER bit from the

deserializer and writes to the GMSL serializer.

Generates R0, triggered by the

µC’s write of BKSV.

—

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