Repeater Support; Repeater Routines Performed By The Edid/Repeater Controller - Analog Devices Advantiv ADV7604 Hardware Manual

• 0x03: General Control Packet
• 0x07: DSD Audio Sample Packet
• 0x09: HBR Audio Stream Packet

7.20 Repeater Support

The ADV7604 incorporates an EDID/Repeater controller that provides all the features required for a
receiver front end of a fully HDCP 1.3 compliant repeater system. The ADV7604 has a RAM that
can store up to 24 KSVs, which allows it to handle up to 24 downstream devices in repeater mode
(refer to Table 30).
The ADV7604 features a set of HDCP registers, defined in the HDCP specifications, which are
accessible through the DDC bus (refer to Section 16.2) of the selected port (refer to Section 7.3). A
subset of the HDCP registers (defined in the following subsections) are also available in the Repeater
Map and are accessible through the main I

7.20.1 Repeater Routines Performed by the EDID/Repeater Controller

7.20.1.1 Power Up
A power-on reset circuitry on the DVDD supply is used to reset the EDID/Repeater controller when
the ADV7604 is powered up. When the EDID/Repeater controller reboots after reset, it resets all the
KSV registers listed in
7.20.1.2 AKSV Update
The EDID/Repeater controller resets automatically the BCAPS[0] bit to 0 when an HDCP transmitter
writes its AKSV into the ADV7604 HDCP registers through the DDC bus of the selected HDMI
port.
Note: It is possible to fake an AKSV update by writing into the AKSV registers in the Repeater Map.
This triggers the EDID/Repeater controller to reset the BCAPS[5] bit back to 0.
7.20.1.3 KSV List Ready
The EDID/Repeater controller computes the SHA-1 hash values once an external controller has set
the BSTATUS registers and KSV list, and set the
sets BCAPS[5] to 1 when it has completed the computation of the SHA-1 hash values. The computed
results are available in the HDCP registers through the DDC port, and in the Repeater Map through
2
the main I C port (refer to
Rev. F August 2010
2
C port (refer to Section 16.1).
Table 30 to 0x00.
Table 31).
KSV_LIST_READY
174
ADV7604
bit. The external controller