Artesyn COMX-P2020 Installation and Use (July 2014) - Manual (Page 79)

Functional Description
COMX-P2020 COM Express Module Installation and Use (6806800K97D) 79
4.3.4 EEPROM
COMX-P2020 COM Express Module uses two 256x8(2 Kb) I2C EEPROM for boot up
configuration.
4.4 Video
COMX-P2020 COM Express Module has an on-board GPU Z11M which supports the following:
 VGA
 LVDS (requires an external DVO to LVDS transmitter)
GPU Z11M integrates a PCI-E 1x controller and a 64-bit 2D graphics engine. It also has a
4Mx16bit DDR memory.
4.5 I2C
4.5.1 I2C Bus
There are two inter-IC (IIC or I2C) bus interfaces implemented on this device. All of the
interfaces will operate at the master mode.
4.5.2 I2C EEPROM
There are two I2C EEPROMs AT24C02B which are located on I2C#1. One is for ID EEPROM
(storing board serial number, MAC address etc.) and the other is for Processor EEPROM (storing
processor ID etc). Their I2C addresses are 0xA0 and 0xA8 separately. To access Processor
EEPROM, the I2C switch must connect MUX_I2C#0.
4.5.3 PCA9545
The PCA9545 is a quad bi-directional translating switch controlled using the I2C bus.The I2C
addressof PCA9545 is E0. The SCL/SDA upstream pair fans out to four downstream pairs or
channels. Any individual SCx/SDx channel or combination of channels can be selected,
determined by the contents of the programmable control register.