AMY-6M - Data Sheet
UBX-13004381 - R07
Production Information
Functional description
Page 10 of 28
1.11.5
Dual Power Supply
The AMY-6M provides the following power supply options:
1.
A single supply voltage can be used for the complete system.
2.
The RF and baseband sections can be separately supplied using different voltages.
Using dual voltages enables significant reductions in power consumption. The highest efficiencies are achieved
by supplying the baseband with 1.4V and the RF with 1.8V.
1.12
Configuration
System configuration goes through multiple steps. The priority of the information found at different sources is as
follows:
1.
Actual configuration in system RAM
2.
Configuration in backup RAM
3.
Configuration in serial EEPROM, serial Flash (DDC, SPI)
4.
Configuration through CFG pins
5.
Default (ROM) settings
During system boot, the system first starts from the ROM default settings. Then it tries to find out where the
actual configuration can be found, i.e. it searches for EEPROM, backup RAM and looks for valid contents. Thus,
a search tree can be built and any configuration setting that is needed by the firmware is searched downwards
from the most actual (system RAM) to the most outdated (system ROM) information. The system uses the first
valid information it finds.
1.12.1
Configuration Pins
The AMY-6M provides 2 configuration pins (
CFG_xxx
)
for boot-time configuration. These become effective
immediately after start-up. Once the module has started, the configuration settings may be modified with UBX
configuration messages. The modified settings remain effective until power-down or reset. If these settings have
been stored in battery-backup RAM, then the modified configuration will be retained, as long as the backup
battery supply is not interrupted. In the following tables, all default settings (pin left open) are
bold
.
The first step performed by the system at boot-time is to analyze the SAFEBOOT_N pin. If it is pulled low, the
system will start up in safe mode using as few configuration settings as possible and with only the minimum
functionality required to establish communication with the host. No GPS operation is started.
TDI / SAFEBOOT_N
1
Normal Boot
0
Safe Mode, minimal ROM boot, Ignore Backup RAM & FLASH.
Table 5: SAFEBOOT Configuration
The protocol and baud rate of the communication interfaces (UART, USB) can be configured using the
CFG_COM pins as follows:
