Ddc Port A; C Protocols For Access To Hdcp Registers; Ddc Port B; Figure 139: Current Address Read Sequence - Analog Devices ADV7850 Hardware Manual

ADV7850 stores an address counter for each DDC port that maintains the value of the subaddress that was last accessed. The
address counter is incremented by 1 every time a read or a write access is requested on the DDC port.
CURRENT ADDRESS
READ SEQUENCE
I

C Protocols for Access to HDCP Registers

2
14.2.2
An I C master connected on a DDC port can access the internal HDCP controller using the following protocol:
2
• Write sequence, as defined in Section
• Read sequence, as defined in Section
•
Short read format, as defined in the High-bandwidth Digital Content Protection (HDCP) System Specifications

DDC Port A

14.2.3
The DDC lines of the HDMI port A comprise the DDCA_SCL and DDCA_SDA pins. An HDMI host connected to the DDC port A
accesses the internal E-EDID at address 0xA0 in read only mode, and the HDCP registers at address 0x74 in read/write mode (refer to
Figure 140). The internal E-EDID for port A is described in Section 7.9.
Refer to the High-bandwidth Digital Content Protection (HDCP) System Specifications for detailed information on the HDCP registers.
(SA = Slave Address)

DDC Port B

14.2.4
The DDC lines of the HDMI port B comprise the DDCB_SCL and DDCB_SDA pins. An HDMI host connected to the DDC port B
accesses the internal E-EDID at address 0xA0 in read-only mode, and the HDCP registers at address 0x74 in read/write mode (refer to
Figure 141). The internal E-EDID for port B is described in Section
Refer to the High-bandwidth Digital Content Protection (HDCP) System Specifications for detailed information on the HDCP registers.
Rev. A May 2012
LSB = 1
s SLAVE ADDR DATA(1)
A(S)
S= START BIT A(S) = ACKNOWLEDGE BY SLAVE
P = STOP BIT A(M) NO-ACKNOWLEDGE BY MASTER

Figure 139: Current Address Read Sequence

14.1.2
14.1.2

Figure 140: Internal E-EDID and HDCP Registers Access from Port A

Figure 141: Internal E-EDID and HDCP Registers Access from Port B

...
A(S)
7.10.
390
ADV7850
DATA(N)
A(M) P