rtd cpuModule CMC6686GX, User Manual

Page: 52 / 118

51
The following table lists signals of the AT portion of the PC/104 bus.
Notes:
ISA bus refresh is not supported by this cpuModule.
Keying pin positions have the pin cut on the bottom of the board and the hole plugged in the con-
nector to prevent misalignment of stacked modules. This is a feature of the PC/104 specification and
should be implemented on all mating PC/104 modules.
Signals marked with (*) are active-low.
All bus lines can drive a maximum current of 4 mA at TTL voltage levels.
PC/104 AT Bus Connector,
P4 or CN1
Pin Row C Row D
0 0V 0V
1 SBHE* MEMCS16*
2 LA23 IOCS16*
3 LA22 IRQ10
4 LA21 IRQ11
5 LA20 IRQ12
6 LA19 IRQ15
7 LA18 IRQ14
8 LA17 DACK0*
9 MEMR* DRQ0
10 MEMW* DACK5*
11 SD8 DRQ5
12 SD9 DACK6*
13 SD10 DRQ6
14 SD11 DACK7*
15 SD12 DRQ7
16 SD13 +5V*
17 SD14 MASTER*
18 SD15 0V
19 (Keying pin) 0V