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Interfaces and Connectors

Revised July 2011 Trim-Slice 14

4 SYSTEM LOGIC

4.1 Power Subsystem

4.1.1 Power Rails

The Trim-Slice is powered with a single 12V power supply.

Table 7 Power signals

Signal Name

Type

Description

VIN_12V

Main power supply. Typical voltage – 12V.

GND

Common ground.

4.1.2 Power Modes

The Trim-Slice supports two hardware power modes.

Table 8 Power modes

Power Mode

Description

All internal power rails are enabled. Mode entered automatically when main

power supply is connected.

OFF

All internal power rails except those required for the power management logic

are switched off.

4.1.3 RTC Back-Up Battery

The Trim-Slice features an on-board 18mAh rechargeable coin cell lithium battery, which maintains

the Trim-Slice RTC whenever the main power supply is not present.

4.2 Firmware Boot Options

The Trim-Slice supports the following firmware boot options:

 Boot from on-board SPI NOR flash

 Boot from external SD card inserted into the P2 SD socket

The boot option is selected with the recovery-boot button SW2. The default boot option is designed

for normal system operation with the on-board SPI NOR flash acting as the boot media. The alternate

boot option is intended mainly for system recovery.

NOTE: The recovery-boot button only affects the firmware (Tegra2 BCT and boot-loader) boot

process. O/S and file-system boot configuration is determined by the boot-loader

settings.

Table 9 Boot options

Boot option

Recovery-boot button (SW2) state

Boot device

Default

Not pressed.

On-board flash

Alternate

Pressed during system reset / power cycle.

SD card

1 2 ... 9 10 11 12 13 14 15 16 17 18 19 ... 23 24

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