DIGITAL-LOGIC SM800/900DK, Technical User'S Manual, Page: 59 / 103

DIGITAL-LOGIC AG
SM800/900DK Technical Manual V1.2B
59
12.4.5. Reset Inputs of the Module
The Reset Input is optionally used to connect a reset switch. The reset switch overrides the internal Reset
Controller.
Reset Inputs of the SM800/900
Signals Value/Function Used for If used If not used
ResetIn# (A79) Manual Reset
Input
Switch to ground with
a momentary switch Open
PWRBTN# (B31) ATX power switch
Input
Start the
computer
Switch to ground with
a momentary switch. Open
AutoStart-Mode: (Default)
If X200A-Pin43 is open, then the Autostart-Mode is enabled and the PWRBTN is not needed to start.
ATX-Mode:
If X200A-Pin43 is pulled high with 470 Ohms to 5V, the system waits after VCC5SB is available until
the PWRBTN# is activated by pulling to GND.
12.4.6. LPC Bus of the Module
The LPC Bus is used to connect a secondary SuperIO chip, for an optional firmware hub and for the POD80
port. We recommend connecting all LPC signals to, at minimum, a 10pin header. Please see the sample
schematics. DIGITAL-LOGIC provides an LPC-POD analyzer to display the POD codes from the BIOS. The
LPC-Bus is length sensitive (maximum 20cm).
LPC Bus of the SM800/900
Signals Value/Function Used for If used If not used
LPC (A46-A58) LPC-Bus LPC-devices Connect to LPC chips
and minimum to a
10pin header for the
POD80 analyzer Open, not recommended
12.4.7. Suspend Outputs of the Module
The suspend signals are power control signals for controlling the external power generators. See the sample
schematics to better understand this function.
Suspend Outputs of the SM800/900
Signals Value/Function Used for If used If not used
SUSA# (A98) No function Internally pulled to 3.3V Open
SUSB# (A99) No function Internally pulled to 3.3V Open
SUSC# (A100) Power control Switch on/off
the external
3.3V, 5V or 12V
supplies
0 = Computer OFF
1 = Computer ON
connected to the gate of
a FET Open
Normaly used, see
sample schematics
The SUSC# is an open collector signal that is pulled to GND when level is ‘0’ (on the SM800PCX). When
level is ‘1’ or ON, this signal is Z-State (on the SM800PCX), the motherboard will define the level as 3.3V or
5V with a 1k pullup resistor (TTL) or 100k in the case of a FET-Gate.
ATTENTION!
Never apply voltages over 5V or the PM-controller will be destroyed!