Specifications

TME-104-CLR-LX800-R1V3.doc Rev. 1.3 34(53)
3.20 PC/104 Bus Interface
The PC/104 bus is a modification of the industry standard (ISA) PC bus specified in IEEE P996. The
PC/104 bus has different mechanics than P966 to allow the stacking of modules. The main features
are:
• Supports programmable extra wait state for ISA cycles
• Supports I/O recovery time for back-to-back I/O cycles
The following table shows the pin assignment of the PC/104 connector.
Note: -5 V on the PC/104 connector is not supported on this board.
PC/104 Bus Connector
Pin A B
1 IOCHCK GND
2 D7 RSTDRV
3 D6 +5V
see note
4 D5 IRQ9
5 D4 -5V
6 D3 DRQ2
7 D2 -12V
see note
Pin D C 8 D1 ENDXFER
0 GND GND 9 D0 +12V
1 MEMCS16 SBHE 10 IOCHRDY KEY
2 IOCS16 LA23 11 AEN SMEMW
3 IRQ LA22 12 A19 SMEMR
4 IRQ LA21 13 A18 IOW
5 IRQ LA20 14 A17 IOR
6 IRQ LA19 15 A16 DACK3
7 IRQ LA18 16 A15 DRQ3
8 DACK LA17 17 A14 DACK1
9 DRQ MEMR 18 A13 DRQ1
10 DACK MEMW 19 A12 REFRESH
11 DRQ SD8 20 A11 SYSCLK
12 DACK SD9 21 A10 IRQ7
13 DRQ SD10 22 A9 IRQ6
14 DACK SD11 23 A8 IRQ5
15 DRQ SD12 24 A7 IRQ4
16 +5V SD13 25 A6 IRQ3
17 MASTER SD14 26 A5 DACK2
18 GND SD15 27 A4 TC
19 GND GND 28 A3 BALE
29 A2 +5V
30 A1 OSC
31 A0 GND
32 GND GND