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TS-3200 User's Manual
13 PC/104 Bus Expansion
The PC/104 is a compact implementation of the PC/AT ISA bus ideal for embedded applications.
Pin #
Signal Name
B5
-5V
B6
DRQ2
B7
-12V
B8
ENDXFR#
B9
+12V
B15
DACK3# ‡
B16
DRQ3 ‡
B17
DACK1#
B18
DRQ1
B26
DACK2#
B27
TC
Table 3 - Unsupported PC/104 Signals
on the 8-bit Bus
‡ PC/104 expansion cards must not
connect to these pins.
Pin #
Signal Name
C1
SBHE#
LA23 – LA17
C2 – C8
MEMR#
C9
MEMW#
C10
D8 – D15
C11-18
MEM16#
D1
IO16#
D2
IRQ14
D7
Table 5 – Supported signals
on the optional 16-bit PC/104
The TS-3200 implements an 8-bit or 16-bit version of the PC/104
bus with a few signals not supported. We have found this allows the
support of the vast majority of PC/104 boards including all of the
above mentioned examples. The one feature missing is DMA,
which few PC/104 boards use.
Pin B19 (normally not used) has been reassigned to be a User Chip Select. This active low signal
decodes the I/O address range 140h through 15Fh, to allow for simple low-cost daughter board
designs. The User Chip Select uses the 386EX CS0. This can be easily programmed to be at any I/O
location or memory range. This pin can also be used for general purpose I/O as bit 0 of Port 2 of the
386EX. All Technologic Systems 3000 and 5000 series products will support this feature.
Designers benefit from using an already-developed standard,
rather than creating their own. Further, the presence of a compact
form-factor PC compatible standard has encouraged the
development of a broad array of off-the-shelf products, allowing a
very quick time to market for new products.
The electrical specification for
the PC/104 expansion bus is
identical to the PC ISA bus.
The mechanical specification
allows for the very compact
implementation of the ISA bus
tailor made for embedded
systems. The full PC/104
specification is available from
the IEEE Standards Office
under # IEEE P996.1 (see
Appendix G for further
information). Basically, this bus
allows multiple daughter boards
in a 3.6 inch by 3.8-inch form
factor to be added in a self-
stacking bus. Since the
electrical specs are identical
(except for drive levels) to a
standard PC ISA bus, standard
peripherals such as COM ports,
Ethernet, video, LCD drivers,
and Flash drives may be easily
added using standard drivers.
16
Technologic Systems
Pin #
Signal Name
A1
IRQ1†
A2 - A9
D7 – D0
A10
IOCHRDY
A11
EN
A12 - A31
A19 – A0
A32
GND
B1
GND
B2
RESETDRV
B3
+5V
B4
IRQ9
B11
SMEMW#
B12
SMEMR#
B13
IOW#
B14
IOR#
B19
User Chip Select #
B20
SYSCLK (8.33 MHz)
B21
IRQ7 †
B22
IRQ6 †
B23
IRQ5 †
B24
IRQ4 †
B25
IRQ3 †
B28
BALE
B29
+5V
B30
OSC
B31
GND
B32
GND
Table 4 - Supported PC/104
Signals On the 8-bit Bus
These signals are also
†
connected to the DIO ports.
05/21/2009
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