Analog Devices Advantiv ADV7611 Hardware User's Manual page 42

UG-180
Notes
•
After the part has powered up, it is recommended to wait for 1 ms before checking the
HDCP_KEY_ERROR flag bits. This ensures that the ADV7611 had sufficient time to access the internal HDCP ROM and set the
HDCP_KEYS_READ and
•
After an AKSV update from the transmitter, it is recommended to wait for 2 ms before checking the
HDCP_KEY_ERROR flag bits. This ensures that the ADV7611 had sufficient time to access the internal HDCP ROM, and set the
HDCP_KEYS_READ and HDCP_KEY_ERROR flag bits.
•
When the ADV7611 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 ADV7611 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 ADV7611 to read the KSV or the keys from the HDCP ROM.
•
The ADV7611 takes 1.8 ms to read the keys from the HDCP ROM
HDCP Ri Expired
Following register allows early detection of HDMI TX failure. Also refer to interrupt status controls RI_EXPIRED_A_ST.
HDCP_RI_EXPIRED , Addr 68 (HDMI), Address 0x04[3] (Read Only)
Readback high when a calculated Ri has not been read by the source TX, on the active port. It remains high until next Aksv update.
Function
HDCP_RI_EXPIRED
0 (default)
1
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
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 7. HDCP ROM Access After KSV Update from the Transmitter
HDCP_KEY_ERROR flag bits.
2
C lines and the HDCP lines are independent of each other. It is, therefore, possible to access the
Description
Calculated Ri has been read by the source TX
Calculated Ri has not been read by the source TX
NO
HDCP_KEY_ERROR = 1
Rev. A | Page 42 of 184
Hardware User Guide
HDCP_KEYS_READ and
HDCP_KEYS_READ and