Analog Devices Advantiv ADV7619 Hardware User's Manual page 38

UG-237
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_PORT_B[15:0]and
•
After EDID_B_ENABLE is set to 1, the ADV7619 EDID/Repeater controller computes the 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 EDIDBlock 2
•
0xFE, 0x17F, and the register SPA_LOCATION[7:0], which is the SPA located in the EDIDBlock 3
•
After power up, the ADV7619 E-EDID controller sets all bytes in the internal EDID RAM to 0; 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[7:0] must be programmed with a value greater than 0x7F, as SPA is always located in the E-EDID Blocks 1, 2 or 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
•
The internal E-EDID can be accessed in read/write mode through the general I
•
The SPA_PORT_B[15:0] register does not have to be programmed with an actual SPA value. It can be programmed with any value
that must be read from the location SPA_LOCATION[7:0] when the internal E-EDID is accessed from the DDC lines of Port B.
This allows support for non-CEA-861 compliant E-EDIDs (that is, VESA-only compliant E-EDID for analog inputs).
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
SPA_PORT_B[15:0], Addr 64 (Repeater), Address 0x52[7:0]; Address 0x53[7:0]
Source Physical Address for Port B. This is used for CEC and is located in the HDMI Vendor Specific data block in the E-EDID.
Function
SPA_PORT_B[15:0]
0000000000000000 (default)
xxxxxxxxxxxxxxxx
SPA_LOCATION[7:0], Addr 64 (Repeater), Address 0x70[7:0]
This is the location in the E-EDID record where the SPA is located.
Function
SPA_LOCATION[7:0]
11000000 (default)
xxxxxxxx
PORT_B_CHECKSUM[7:0], Addr 64 (Repeater), Address 0x61[7:0]
This is the checksum for the second half of the Port B EDID. This is calculated automatically.
Function
PORT_B_CHECKSUM[7:0]
xxxxxxxx
00000000 (default)
SPA_LOCATION[7:0],
Description
Default value
Source physical address of Port B
Description
Default value
Location of source physical address in internal E-EDID of Port B
Description
Checksum for E-EDID block containing SPA for Port B
Default value
Rev. A | Page 38 of 204
Hardware User Guide
respectively.
2
C address 0xA0.
2
C interface at the EDID map I
2
C address.