Spi Interface - Analog Devices ADV7850 Hardware Manual

Function
edid_pwrsw1p8[1:0]
00 
01
10
11
edid_pwrsw3p3[1:0], Addr 68 (HDMI), Address 0x71[3:2]
Controls the switch related to EDID power domain taking the system or the cable supply. Dedicated control for the 3.3V domain.
Function
edid_pwrsw3p3[1:0]
00 
01
10
11

7.8 SPI INTERFACE

The ADV7850 has a 4-pin SPI interface to load the E-EDID information from the SPI EEPROM into the internal E-EDID RAM:
•
EP_MOSI
• EP_CSB
• EP_MISO
• EP_SCK
The SPI interface offers the user controls to tristate the SPI pins, load the E-EDID data image from the SPI EEPROM into the internal E-
EDID RAM, or store the E-EDID data image from the internal E-EDID RAM into the SPI EEPROM.
Note: vga_edid_enabled must be left at its default value of 0 in order to use the load_edid and store_edid functions.
ext_eeprom_tri, Addr 64 (Repeater), Address 0x72[6]
This control is used to tristate the output pins to the external SPI EEPROM.
Function
ext_eeprom_tri
0 
1
load_edid, Addr 64 (Repeater), Address 0x77[1] (Self-Clearing)
This control is used to force the loading of internal E-EDID RAM with external SPI EEPROM contents. This automatically triggers a
cksum_calc event.
Function
load_edid
0 
1
store_edid, Addr 64 (Repeater), Address 0x77[0] (Self-Clearing)
This control is used to write the contents of the internal E-EDID RAM to the external SPI EEPROM. It is a self clearing control.
Rev. A May 2012
Description
Power switch always takes the cable supply
Power switch takes the system supply, whenever it is available, otherwise the cable supply
Power switch takes the cable supply whenever it is available, otherwise the system supply
Power switch takes the cable supply whenever it is available, otherwise the system supply
Description
Power switch always takes the cable supply
Power switch takes the system supply, whenever it is available, otherwise the cable supply
Power switch takes the cable supply whenever it is available, otherwise the system supply
Power switch takes the cable supply whenever it is available, otherwise the system supply
Description
Enable SPI interface outputs
Tristate SPI interface outputs
Description
No effect
Load internal E-EDID with SPI EEPROM contents
145
ADV7850