Analog Devices Advantiv ADV7619 Hardware User's Manual page 51

Hardware User Guide
Notes
•
After the part has powered up, it is recommended to wait for 1 ms before checking the HDCP_KEYS_READ and
HDCP_KEY_ERROR flag bits. This ensures that the ADV7619 had sufficient time to access the internal HDCP ROM and set the
HDCP_KEYS_READ and HDCP_KEY_ERROR flag bits.
•
After an AKSV update from the transmitter, it is recommended to wait for 2 ms before checking the HDCP_KEYS_READ and
HDCP_KEY_ERROR flag bits. This ensures that the ADV7619 had sufficient time to access the internal HDCP ROM, and set the
HDCP_KEYS_READ and HDCP_KEY_ERROR flag bits.
•
When the ADV7619 successfully retrieves the HDCP keys and/or KSV from the internal HDCP ROM, the HDCP_KEYS_READ flag
bit is set to 1 and the HDCP_KEY_ERROR flag bit is set to 0.
•
2
The I C controllers for the main I
internal registers of the ADV7619 while it reads the HDCP keys and/or the KSV from the internal HDCP ROM.
•
A hardware reset (that is, reset via the reset pin) does not lead the ADV7619 to read the KSV or the keys from the HDCP ROM.
•
The ADV7619 takes 1.8 ms to read the keys from the HDCP ROM
HDCP Ri Expired
Following register allows early detection of HDMI TX failure. Please also refer to interrupt status controls RI_EXPIRED_A_ST ,
RI_EXPIRED_B_ST .
START
(AKSV UPDATE
FROM TRANSMITTER)
HDCP_KEY_READ = 0
HDCP_KEY_ERROR = 0
READ KSV, HDCP KEYS AND
CHECKSUM CS2 FROM HDCP PROM
DERIVE CHECKSUM CS2'
FROM KSV AND HDCP KEYS
NO
CS1 = CS1'
YES
DERIVE LINK VERIFICATION Ri'
UPDATE BKSV AND Ri' IN
HDCP RESGISTERS
HDCP_KEY_READ = 1
END
HDCP_KEY_ERROR = 0
END
Figure 12. HDCP ROM Access After KSV Update from the Transmitter
2
C lines and the HDCP lines are independent of each other. It is, therefore, possible to access the
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HDCP_KEY_ERROR = 1
UG-237