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R
X-Ref Target - Figure 2-3
I2C Buses
FMC I2C
IPMI
EEPROM
0xA0, A2, A4, A6
Figure 2-3: FMC I 2 C Bus
Control I 2 C
Two of the general-purpose I/O pins of the FMC interface are used to implement an I 2 C
bus to be used for general configuration and status. It was necessary to separate these
devices from the FMC I 2 C bus due to potential I 2 C device address conflicts that would
occur with some of the IC and FMC slot configurations. Separating this bus eliminates this
danger.
As shown in Figure 2-4 , this I 2 C bus directly connects to three of the video ICs, an I/O
expander, and an I 2 C mux. The interface to the video IC is used to configure these
interfaces. The I 2 C multiplexer is used to access three other devices. These devices include
the two cameras and the EDID EEPROM. The two cameras must be isolated behind this
switch because they are at the same device address and would conflict if both connected to
the same bus. The EDID EEPROM must be isolated since this bus normally has an I 2 C
master at the DVI video source. The interface to the EDID EEPROM should only be used to
program the EEPROM at times when it will not be read by the remote master.
X-Ref Target - Figure 2-4
Camera 1
0xB8
Ctrl I C
I C Mux
2
2
PCA9546A
0xE8
I/O Expander
PCA9555
Camera 2
0xB8
EDID
EEPROM
0xA0
0x40
Video Encoder
ADV7179
0x54
Video Decoder
ADV7180
0x42
Analog Interface
AD9984A
0x9A
ug458_04_102507
Figure 2-4: Control
I 2 C
Bus
The I/O expander is used to interface to miscellaneous control and status signals, as
identified in Table 2-3 .
FMC-Video Daughter Board
UG458 (v1.1) February 8, 2008
www.xilinx.com
19
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