48SWTQFN-EP datasheet(81/103 Pages) MAXIM

81 / 103 page

MAX9288/MAX9290

3.12Gbps GMSL Deserializers

for Coax or STP Input and MIPI CSI-2 Output

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

and Second Parts of the HDCP Authentication Protocol (continued)

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

—

When GPIO_0 = 1 is detected,

enables encryption on the

(TX_R1, RX_D1) and (TX_R2,

RX_D2) links.

TX_R1, TX_R2:

Encryption enabled

after next VSYNC

falling edge.

RX_D1, RX_D2:

Decryption enabled

after next VSYNC

falling edge.

Waits for some time to allow

µC_R to make the KSV list

ready in RX_R1. Then polls

(reads) the KSV_LIST_READY

bit of RX_R1 regularly until

proper acknowledge frame is

received and bit is read as 1.

Blocks control channel

from µC_B side by setting

REVCCEN = FWDCCEN = 0

in RX_R1. Retries until proper

acknowledge frame received.

—

RX_R1: Control

channel from serializer

side (TX_B1) is blocked

after FWDCCEN =

REVCCEN = 0 is

written.

Writes BKSVs of RX_D1 and

RX_D2 to the KSV list in RX_

R1. Then, calculates and writes

the BINFO register of RX_R1.

—

RX_R1: Triggered by

µC_R’s write of BINFO,

calculates hash value

(V’) on the KSV list,

BINFO and the secret-

value M0’.

Writes 1 to the KSV_LIST_

READY bit of RX_R1 and then

unblocks the control channel

from the µC_B side by setting

REVCCEN = FWDCCEN = 1 in

RX_R1.

—

RX_R1: Control channel

from the serializer side

(TX_B1) is unblocked

after FWDCCEN =

REVCCEN = 1 is

written.

Reads the KSV list and BINFO

from RX_R1 and writes them

to TX_B1. If any of the MAX_

DEVS_EXCEEDED or MAX_

CASCADE_EXCEEDED bits

is 1, then authentication fails.

Note: BINFO must be written

after the KSV list.

—

TX_B1: Triggered by

µC_B’s write of BINFO,

calculates hash value

(V) on the KSV list,

BINFO and the secret-

value M0.

—

Reads V from TX_B1 and V’

from RX_R1. If they match,

continues with authentication;

otherwise, retries up to two

more times.

—

Searches for each KSV in the

KSV list and BKSV of RX_R1 in

the Key Revocation list.

—

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