Internal Edid; Edid Ram; Figure 21: Internal Edid Ram Map - Analog Devices Advantiv ADV7604 Hardware Manual

7.4

Internal EDID

7.4.1

EDID RAM

The ADV7604 features a 512 byte internal RAM dedicated to storing up to four EIA/CEA-861D
compliant E-EDID blocks, which can be accessed through the DDC lines of each HDMI port (refer
to Figure 21).
The internal E-EDID RAM is accessible through the 256 byte EDID Map via the main I
SDA/SCL. The EDID_RAM_POINTER
accessed through the EDID Map (refer to
The internal E-EDID image that is contained in the internal EDID RAM is accessed through the
DDC port A, B, C, and D as a shared image except for the two SPA which is specific for each port,
and the checksum corresponding to the EDID block were the two-byte SPA is located.
Rev. F August 2010
bit is used to select the section of the internal RAM that is
Figure 22).
0x1FF
Block 3
0x180
0x17F
Block 2
0x100
0xFF
Block 1
0x80
0x7F
Block 0
0x00

Figure 21: Internal EDID RAM Map

99
Segment 1
Segment 0
ADV7604
2
C port