Advantech SOM-6868, Manual

Page: 20 / 92

7 SOM-6868 User Manual
Chapter 1
G
eneral
Information
– Even, odd, or no parity bit selectable
– 1, 1.5, or 2 stop bit selectable
– Baud rate up to 115.2K

Express Card
2 sets of Express Card control signals including card detection and reset follow-
ing the PICMG COM Express R2.1 specification.

TPM
Module is an optional BOM item to support TPM 1.2 module. If the user wants
TPM function, please contact sales to add components on the module board
and enable BIOS items.

Smart Fan
Supports two Fan PWM control signals and two tachometer inputs for fan speed
detection. Provides one on module with connector and the other to the carrier
board following the PICMG COM Express R2.1 specification.

BIOS
A BIOS chip is on the module by default. Also allows the user to place the BIOS
chip on the carrier board with the appropriate design and jumper setting on
BIOS_DIS#[1:0].
Power Management

Power Supply
Supports both ATX and AT power modes. VSB is for suspend power and can be
optional if not requiring standby (suspend-to-RAM) support. RTC Battery may
be optional if keeping time/date is not required.
VCC: 4.75V (5V-5%) – 20V (19V+5%)
VSB: 5V +/- 5% (Suspend power)
RTC Battery Power: 2.0V – 3.3V

PWROK
Power check from the main power supply. A high value indicates that the power
is good. This signal can be used to hold off the module startup to allow carrier
board based FPGAs or other configurable devices time to be programmed.

Power Sequence
According to PICMG COM Express R2.1 specification

Wake Event
Various wake-up event support allows the user to apply to different scenarios.
– Wake-on-LAN(WOL): Wake to S0 from S3/S4/S5
– USB Wake: Wake to S0 from S3/S4
– PCIe Device Wake: depends on user inquiry and may need customized BIOS
– LPC Wake: depends on user inquiry and may need customized BIOS
BIOS_DIS0
# BIOS_DIS#
1
Boot up destination/function
Open Open Boot from Module’s SPI BIOS
GND Open Boot from Carrier Board LPC/FWH BIOS
Open GND SPI_CS0# to Carrier Board, SPI_CS1# to Module
GND GND SPI_CS0# to Module, SPI_CS1# to Carrier Board
Note! If system COMS are cleared, we suggest you go to BIOS setup menu
and load default settings the first time you boot up.