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Configuration and Setup
Table 3. AM437x GP EVM APM Sense Resistors
VOLTAGE NET
SENSE RESISTOR VALUE
VDD_CORE
0.05 ohm
VDD_MPU
0.05 ohm
VAM437X_DDR
0.05 ohm
VDDS_DDR
0.05 ohm
V1_8D_AM437X
0.1 ohm
V3_3D_AM437X
0.1 ohm
4
Configuration and Setup
4.1
Boot Configuration
The AM437x has sysboot pins that can be configured using two 5-bit DIP switches on the EVM. These
sysboot switches will configure the AM437x to different boot settings. The SW12 switch can be used to set
sysboot bits 0 to 4, and the SW11 switch can set sysboot bits 5, 6, 9, 12, and 13. Other sysboot pin
settings are done through resistors either pulled high or low. See the AM437x TRM and
data sheet
for the
definitions of each of the sysboot signals. See the GP EVM schematic for more details.
4.2
I2C Address Assignments
In the AM437x GP EVM boards, each separate board has an I2C ID memory that contains the details of
the identity of that board, such as its configuration. See the following sections for more details on the
memories' contents.
Table 4. AM437x I2C Bus Addresses
AM437X FUNCTION
AM437X I2C PORT
ADDRESS
Board ID memory
I2C0
0x50
PMIC control
I2C0
0x2D
Touch screen control
I2C1
0x5C
Camera module 0
I2C0
0xxx
Camera module 1
I2C1
0xxx
Audio codec
I2C0
0x18
HDMI transmitter
I2C2
0x76
HDMI companion chip
I2C2
0xxx
Multiple smart card slot interface IC
I2C2
0xxx
4.3
I2C ID Memory
The GP EVM has a dedicated I2C EEPROM, which contains specific identity and configuration information
for that board. In addition, the dedicated I2C EEPROM has available space in each memory for user-
specific configuration information.
The part number of the memory device is CAT24C256WI-G.
7
SPRUHW7 – June 2014
AM437x GP EVM Hardware User's Guide
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