User`s guide

T-MOPSlcdSA User's Guide
ISA and PC/104 Bus Expansion 15
15
7. ISA and PC/104 Bus Expansion
The design of the T-MOPSlcdSA follows the standard PC/104 form factor and offers ISA bus signals
for standard PC/104 adapter cards.
7.1 PC/104 Bus (ISA part)
The PC/104 bus consists of two connectors that use 104 pins in total.
 XT bus Connector (64 pins)
 AT bus Connector (40 pins, which is optional for 16-bit, data-bus systems)
The pin-out of the PC/104 bus connectors corresponds to the pin-out of ISA bus connectors with
some added ground pins. The two PC systems with different form factors are electrically
compatible.
XT bus connector, Rows A and B.
The corresponding 64-pin stack through header (ISA bus = 62pins) has two added ground pins at
the end of the connector (Pin A32 and Pin B32). The pin-out between PC/104 bus and XT ISA bus is
identical between A1 - A31 and B1 - B31.
The AT bus extension connector, Rows C and D.
The corresponding 40-pin stack through header (ISA bus = 36 pins) has four added ground pins,
two on each side of the connector. To avoid confusion, the first two pins are defined as Pin C0 and
Pin D0. The additional ground pins at the end of the connector are defined as C19 and D19. The
pin-out between PC/104 bus and AT ISA bus is identical between C1 - C18 and D1 - D18.
The T-MOPSlcdSA features both – XT bus and AT bus extension – on two, dual-row socket
connectors with 2.54mm x 2.54mm grid (0.1" x 0.1").
7.1.1 PC/104 Connectors
The PC/104 XT bus is available through the J9A connector. The PC/104 AT bus is available through
the J9B connector. To find the location of this connector on the T-MOPSlcdSA board, please see the
chapter “Connector Locations”.
A detailed description of the signals including electrical characteristics and timings is beyond the
scope of this document. Please see ISA bus and PC/104 specifications for details.