Analog Devices Advantiv ADV7604 Hardware Manual page 96

7.3.1.3 SPI Interface
The ADV7604 has a 4-pin SPI interface to load the E-EDID information from the SPI PROM:
• EP_MOSI
• EP_CS
• EP_MISO
• EP_SCK
The ADV7604 SPI interface is capable of operating at up to 3MHz (SPI master max frequency). The
ADV7604 uses byte-by-byte reading and page writing.
The SPI interface offers the user controls to tristate the SPI pins, load the EDID data image from the
internal SPI PROM into the E-EDID RAM, or store the EDID data image from the internal E-EDID
RAM into the SPI PROM.
EXT_EEPROM_TRI, External EEPROM Tristate, Repeater Map, Address 0x78, [6]
Function
EXT_EEPROM_TRI
0
1
LOAD_EDID, Load EDID, Repeater Map, Address 0x7E, [1]
Function
LOAD_EDID
0
1
STORE_EDID, Store EDID, Repeater Map, Address 0x7E, [0]
Function
STORE_EDID
0
1
Rev. F August 2010
Description
External SPI PROM pins enabled
External SPI PROM pins tristated
Description
No action
EDID/Repeater controller copies the E-EDID image in the SPI
PROM into internal E-EDID RAM, computes the checksums, and
updates the SPA for all ports. This bit is self clearing.
Description
No action
EDID/Repeater controller copies the E-EDID data image from
internal E-EDID RAM into the SPI PROM. This bit is self
clearing.
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ADV7604