Little Board P6d Module
2-43

IrDA Interface

The IrDA interface is described earlier in this chapter.

TTL Serial Ports

The TTL version of the serial ports 1,3, and 4 are brought out to the Utility co nnecto r. The TTL
version of serial port 2 can be rerouted to the IrDA TX and RX lines.

Miscellaneous Power Management Signals

Table 2-42 describes miscellaneous Power Management signals.
Table 2-42. Miscellaneous Power Management Signals

Signal Description

LIDSW Simulates the lid switch of a laptop
PWRBTN Turns of f all but m inim um power or restor es power
BATLOW Simulates a low battery condition
RI Ring indicator I/O: Input to wake up from power off; output from serial port 2 RI
SUSV Low current input voltage to support power off.
SUSC Indicates Suspend To Disk (Power Off)
SMBCLK System Management Bus Clock
SMBDATA System Management Bus Data I/O
SMBALRT System Managem ent Bus Alert
BATV External Battery Input (Only used for special options)
PC/104-Plus Expansion Bus
The PC/104-Plus expansion bus appears on three header connectors, J1, J2, and J3. J1 is a 64- pin
female dual-row header. J2 is a 40-pin female dual-row header, and J3 is a 120-pin 2mm female
quad-row header (4 x 30). The PC bus subset of the PC/104-Plus expansion bus conn ects to J1. Th e
AT expansion bus signals connect to J2. The layout of signals on J1 and J2 is compliant with the
PC/104 bus specification, and make up the ISA bus portion of the PC/104-Plus bus. An
implementation of the PCI bus appears on J3.
PC/104-compatible expansion modules can be installed on the Little Board P6d expansion bus. The
buffered output signals to the expansion bus are standard TTL leve l signals. All inp uts to th e Little
Board P6d system operate at TTL levels and present a typical CMOS load to the e xpan sion bus.

On-board MiniModule Expansion Details

When installed on the PC/104 expansion bus headers, expansion modu les fit w ithin the Little Board
P6d module's outline dimensions. You can install one or more Ampro MiniModule products or other
PC/104 modules on the Little Board P6d expansion connectors. When installed on J1 and J2, the
expansion modules fit within the Little Board P6d module’s outline dimension s.