Specifications

Appendix B MiniModule ISA Board
80 Reference Manual ReadyBoard 800
PCI-104 Interface (P1)
The PCI-104 uses a 120-pin (30x4) 2 mm connector. This connector carries all of the appropriate PCI
and ISA bus signals operating at clock speeds up to 33 MHz. This interface header accepts stackable
modules and is located on both the top and bottom of the MiniModule ISA expansion board.
Table B-3 provides the signals and descriptions for the three dedicated signal lines reserved for the
MiniModule ISA expansion board on the PCI-104 connector. For the complete PCI-104 pin-outs, refer
to Table 3-4 earlier in the manual.
Table B-3. MiniModule ISA Dedicated PCI-104 Signal Lines (P1)
Pin # Signal Input/
Output
Description
31 (B1) SERIRQ Serial IRQ – This signal line provides the ISA IRQs to the PC/104
Bus if the MiniModule ISA expansion board is used.
54 (B24) REQ2* T/S
Bus Request 2 – This signal indicates this device desires use of the
bus to the arbitrator. This request line is not available when the
MiniModule ISA board is used. See Notes.
85 (C25) GNT2* T/S
Grant 2 – This signal line indicates access has been granted to the
requesting device (PCI Masters). This signal line is reserved for
the MiniModule ISA expansion board. See all Notes below.
Notes: The signals marked with * = Negative true logic.
The Input/Output column in this table refers to the input/output signals listed in the PCI Local Bus
Manual, Revision 2.3, Chapter 2, paragraph 2.1, signal definitions. The following terms or acronyms are
used in this table:
• T/S – Tri-State is a bi-directional input output pin
NOTE One request signal (pin 54 or B24, REQ2) and one grant line (pin 85
or C25, GNT2) are not available to other cards/devices when the
MiniModule ISA expansion board is used. These signal lines are
reserved for the MiniModule ISA board, if jumper JP1 is Enabled.