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TS-5500 User's Manual
16 PC/104 Bus Expansion
The PC/104 is a compact implementation of the PC/AT ISA bus ideal
for embedded applications. Designers benefit from using an already-
Pin #
Signal Name
A1
IRQ1†
A2 - A9
D7 through D0
A10
IOCHRDY
A11
AEN
A12 - A31
A19 through A0
A32
GND
B1
GND
B2
RESETDRV
B3
+5V
B4
IRQ9 -- Assigned to
USB Controller
B11
SMEMW#
B12
SMEMR#
B13
IOW#
B14
IOR#
B15
Reserved †
B16
Reserved †
B17
DACK1#
B18
DRQ1
B19
User Chip Select# †
B20
SYSCLK (8.25 MHz)
B21
IRQ7
B22
IRQ6
B23
IRQ5
B24
B25
B27
TC
B28
BALE
B29
+5V
B30
OSC (14.3 MHz)
B31
GND
B32
GND
Table 8 - Supported PC/104
Signals on the 8 -bit Bus
†
these signals have a non-
standard usage.
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 E 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.
The TS-5500 implements a sub-set of
the 8-bit or optionally the 16-bit version
of the PC/104 bus. We have found this
allows the support of the vast majority
of PC/104 boards including all of the above-mentioned examples.
IRQ3 and IRQ4 are typically used by COM2 and COM1 and are not
available on the PC/104 bus. If a daughter board must use either IRQ3 or
IRQ4, it is possible to reconfigure the Elan520 registers and reassign IRQ
lines. Contact us for details.
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.
All Technologic Systems 3000 and 5000 series products will support the
User Chip Select feature.
Memory range C8000-CFFFF is available for custom daughter boards to
map into the memory space on the PC/104 bus. See section 17.4 on
configuring the Custom CMOS settings.
21
Technologic Systems
Pin #
Signal Name
B5
-5V
B6
DRQ2
B7
-12V
B8
ENDXFR#
B9
+12V
B26
DACK2#
Table 9 - Unsupported PC/104 Signals
Pin #
Signal Name
C0
GND
C1
SBHE#
C2 – C8
LA23 – LA17
C9
MEMR#
C10
MEMW#
C11-18
D8 – D15
D0
GND
D1
MEM16#
D2
IO16#
D5
IRQ12
D6
IRQ15
IRQ14
D7
(shared with CF)
D8
DACK0#
D9
DRQ0
D16
+5V
D18, D19
GND
10/31/03
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