NT68665 View Datasheet(PDF) - Unspecified

Part Name

Description

Manufacturer

NT68665

Flat Panel Monitor Controller

Unspecified 

9.33. High-bandwidth Digital Content Protection System

HDCP Index Port Access Control

See section 9.14 Index Port Access Control

NT68665/NT68625

HDCP Control Register Map (MCU I2C side)

ADDRESS R/W Register Name Description

0x300 ~

R BKSV[7:0] Video receiver KSV. This value must always be available for

0x301 ~

BKSV[15:8] reading, and may be used to determine that the video receiver is

0x302 ~

BKSV[23:16] HDCP capable. Valid KSVs contain 20 ones and 20 zeros, a

0x303 ~

BKSV[31:24] characteristic that must be verified by video transmitter hardware

0x304

BKSV[39:32] before encryption is enable.

0x305 ~

R RSVD

Reserved All bytes read as 0x00

0x307

0x308 ~

R Ri’[7:0]

Link verification response. Updated every 128 th frame. It is

0x309

Ri’[15:8]

recommended that graphics systems protect against errors in the

I2C transmission by reading this value when unexpected values

are received. This value must be available at all times between

updates. R0’ must be available a maximum of 100ms after AKSV

is received. Subsequent Ri’ values must be available a maximum

of 128 pixel clocks following the assertion of CTL3

0x30A

R Pj’

Enhanced Link Verification Response. Updated upon receipt of

first video pixel received when frame counter value (j mod 16) ==

0. The value is the XOR of the decrypted byte on channel zero of

the first video pixel with the least significant byte of Rj. Rj is

derived from the output function in the same manner as Ri, but is

captured every 16th counted frame (rather than every 128th

counted frame).

0x30B~0x30F R RSVD

Reserved All bytes read as 0x00

0x310 ~

R/W AKSV[7:0] HDCP Transmitter KSV. Writes to this multi-byte value are written

0x311 ~

AKSV[15:8] least significant byte first. The final write to 0x14 triggers the

0x312 ~

AKSV[23:16] authentication sequence in the HDCP Receiver, and the current

0x313 ~

AKSV[31:24] Ainfo value is copied from the port, takes effect, and the port is

0x314

AKSV[39:32] reset to the default value of zero.

0x315

W Ainfo

Bits 7-2: Reserved zeros.

Bit 1: ENABLE_1.1_FEATURES. This bit enables the Advance

Cipher option. If in DVI mode, it also enables the Enhanced

Encryption Status Signaling (EESS) (in HDMI mode, EESS is

enabled regardless of this bit setting). This bit resets to default

zero when the HDCP Receiver becomes attached or active, or is

reset, or the last byte of Aksv is written. A write to the last byte of

Aksv copies the port value and causes it to take effect, and then

resets the port value to the default value of zero. Thus the options

must be explicitly enabled prior to each authentication.

Bit 0: Reserved (must be zero).

0x316~0x317 R RSVD

Reserved All bytes read as 0x00

0x318 ~

R/W An[7:0]

Session random number. This multi-byte value must be written by

0x319 ~

An[15:8]

the HDCP

0x31A ~

An[23:16]

Transmitter before the KSV is written.

0x31B ~

An[31:24]

0x31C ~

An[39:32]

0x31D ~

An[47:40]

2006-02-09

171

Ver. 0.40

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