Internal Hdcp Key Otp Rom; Hdcp Keys Access Flags - Analog Devices Advantiv ADV7604 Hardware Manual

7.14.2 Internal HDCP Key OTP ROM

The ADV7604 features an on-chip nonvolatile memory that is preprogrammed with a set of HDCP
production keys.

7.14.3 HDCP Keys Access Flags

The ADV7604 accesses the internal HDCP key OTP ROM (also referred to as HDCP ROM) on two
different occasions:
• After a power up, the ADV7604 reads the KSV from the internal HDCP ROM (refer to
Figure 32).
• After a KSV update from an HDCP transmitter, the ADV7604 reads the KSV and all keys in
order to carry out the link verification response (refer to
The display driver can read the
the ADV7604 successfully accessed the HDCP ROM.
HDCP_KEYS_READ, HDCP Keys Read Flag, HDMI Map, Address 0x04, [5]
This bit indicates if the ADV7604 successfully retrieved the HDCP keys and/or KSV from the
internal HDCP key ROM.
Function
HDCP_KEYS_READ
0
1
HDCP_KEY_ERROR, HDCP Key Error Flag, HDMI Map, Address 0x04, [4]
When the ADV7604 reads the internal HDCP key ROM it calculates an 8-bit checksum. If the
calculated checksum is different from the checksum read from the HDCP ROM, the ADV7604 flags
this error by setting the
Function
HDCP_KEY_ERROR
0
1
Rev. F August 2010
HDCP_KEYS_READ
Description
KSV and/or HDCP keys not read yet
KSV and/or HDCP keys read
HDCP_KEY_ERROR
Description
No error occurred while reading HDCP keys
Error occurred while reading HDCP keys
Figure
and HDCP_KEY_ERROR
bit to 1.
122
ADV7604
33).
flags to check that