Figure 56: Hdcp Rom Access After Power Up; Figure 57: Hdcp Rom Access After Ksv Update From The Transmitter - Analog Devices ADV7850 Hardware Manual

Rev. A May 2012
START
(After power up)
HDCP_KEY_READ = 0
HDCP_KEY_ERROR = 0
Read KSV and checksum
CS1 from HDCP OTP ROM
Derive checksum CS1' from
KSV
CS1 = CS1' NO
YES
Set BksV (HDCP register
Address 0x00)
Bksv = KSV
HDCP_KEY_READ = 1
HDCP_KEY_ERROR = 0
End

Figure 56: HDCP ROM Access After Power Up

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
CS2 = CS2' NO
YES
Derive Link Verification Ri'
Update Bksv and Ri' in
HDCP registers
HDCP_KEY_READ = 1
HDCP_KEY_ERROR = 0
End

Figure 57: HDCP ROM Access After KSV Update from the Transmitter

HDCP_KEY_ERROR = 1
HDCP_KEY_ERROR = 1
168
ADV7850