Specifications
Chapter 3 Hardware
28 Reference Manual LittleBoard 800
Pin # Signal Input/
Output
Description
97 (D7) AD12 T/S Address/Data Bus Line 12 – Refer to pin-A3 for more information.
98 (D8) +3.3V +3.3 volts ±5% power supply input
99 (D9) PAR T/S Bus Parity bit – This signal is the even parity bit on AD[31:0] and
C/BE[3:0]*
100 (D10) NC Not connected (Snoop Done)
101 (D11) GND Ground
102 (D12) DEVSEL* S/T/S
Device Select – This signal is driven by the target device when its
address is decoded.
103 (D13) +3.3V +3.3 volts ±5% power supply input
104 (D14) C/BE2* Command/Byte Enable 2 – Refer to pin-A4 for more information.
105 (D15) GND Ground
106 (D16) AD19 T/S Address/Data Bus Line 19 – Refer to pin-A3 for more information.
107 (D17) +3.3V +3.3 volts ±5% power supply input
108 (D18) IDSEL2 Initialization Device Select 2 – Refer to pin-A18 for more info.
109 (D19) IDSEL3 Initialization Device Select 3 – Refer to pin-A18 for more info.
110 (D20) GND Ground
111 (D21) AD27 T/S Address/Data Bus Line 27 – Refer to pin-A3 for more information.
112 (D22) AD31 T/S Address/Data Bus Line 31 – Refer to pin-A3 for more information.
113 (D23) VI/O +5 volts ±5% (Reference voltage only)
114 (D24) GNT0* T/S Grant 0 – Refer to pin-A25 for more information.
115 (D25) GND Ground
116 (D26) CLK1 In Clock 1 – Refer to pin-A27 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) GND Ground
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 2.2, 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.