Analog Devices Advantiv ADV7604 Hardware Manual page 104

Notes:
• When internal E-EDID is required for port B, the SPA along with its location address in the
E-EDID must be programmed in the Repeater Map, registers
SPA_LOCATION
• After
EDID_B_ENABLE
four checksums of the E-EDID image for port B. The E-EDID controller then updates the
checksum registers in the EDID RAM memory location 0x7F and the following three
locations:
0x17F, 0x1FF, and the register SPA_LOCATION[7:0], which is the SPA located in
the EDID block 1
0xFF, 0x1FF, and the register SPA_LOCATION[7:0], which is the SPA located in the
EDID block 2
0xFE, 0x17F, and the register SPA_LOCATION[7:0], which is the SPA located in the
EDID block 3
• After power up, the ADV7604 EDID/Repeater controller sets all bytes in the EDID RAM to
0. Since this operation takes less than 1 ms, it is recommended to wait for at least 1 ms before
initializing the EDID Map with E-EDID.
•
SPA_LOCATION
located in the E-EDID blocks 1, 2, and 3.
• When internal E-EDID is enabled on port B, the Hot Plug should not be asserted until the
EDID Map has been completely initialized with E-EDID.
• The internal E-EDID can be accessed in read-only mode through the DDC interface at the I
address 0xA0.
• The internal E-EDID can be accessed in read/write mode through the general I
the EDID Map I
• The
SPA_PORT_B
be programmed with any value that must be read from the location
the internal EDID is accessed from the DDC lines of port B. This allows support for non
CEA-861 compliant E-EDIDs (e.g. VESA-only compliant EDID for analog inputs).
SPA_PORT_B[15:0], Port B Source Physical Address (SPA), Repeater Map, Address 0x70,
[7:0]; Address 0x71, [7:0]
The SPA of port B is the address of the port B in the CEC interface. The SPA is comprised of four
components, A, B, C, and D as defined in the HDMI specification, which are programmed as
follows:
• SPA_PORT_B[15:12] = A
• SPA_PORT_B[11:8] = B
• SPA_PORT_B[7:4] = C
• SPA_PORT_B[3:0] = D
Function
SPA_PORT_B[15:0]
xxxxxxxx xxxxxxxx
00000000 00000000
Rev. F August 2010
respectively.
is set to 1, the ADV7604 EDID/Repeater controller computes the
must be programmed with a value greater than 0x7F, as SPA is always
2
C address.
register does not have to be programmed with an actual SPA value. It can
Description
Source physical address of port B
Default value
104
SPA_PORT_B and
2
C interface at
SPA_LOCATION
ADV7604
2
C
when