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Chapter 3 Hardware
ReadyBoard 800 Reference Manual 29
Pin # Signal Input/
Output
Description
106 (D16) AD19 T/S
PCI Address and Data Bus Line 19 – See Pin-3 for more
information.
107 (D17) +3.3V +3.3 volts ±5%
108 (D18) IDSEL2 Initialization Device Select 2 – See Pin-18 for more information.
109 (D19) IDSEL3 Initialization Device Select 3 – See Pin-18 for more information.
110 (D20) GND Ground
111 (D21) AD27 T/S
PCI Address and Data Bus Line 27 – See Pin-3 for more
information.
112 (D22) AD31 T/S
PCI Address and Data Bus Line 31 – See Pin-3 for more
information.
113 (D23) VI/O Reference Voltage – +5 volts
114 (D24) GNT0* T/S Grant 0 – See Pin 25 for more information.
115 (D25) GND Ground
116 (D26) CLK1 In PCI clock 1 – See Pin-27 for more information
117 (D27) GND Ground
118 (D28) RST* In PCI bus reset – This signal is an output signal to reset the entire
PCI Bus. This signal will be asserted during system reset
119 (D29) INTC* O/D
Interrupt C – This signal is used to request interrupts only for
multi-function devices.
120 (D30) NC Not Connected
Notes: The shaded area denotes power or ground. The signals marked with * = Negative true logic.
The Input/Output signals in this table refer 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:
• In – Input is standard input only signal
• Out – Totem Pole output is a standard active driver
• T/S – Tri-State is a bi-directional input output pin
• S/T/S – Sustained Tri-State is an active low tri-state signal driven by one and only one
agent at a time
• O/D – Open Drain allows multiple devices to share as a wire-OR.
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. The MiniModule ISA board provides the optional
PC/104 bus (ISA bus) interface.