PC 104 Bus
The PC 104 bus is a standardized bus with 104ISA signals for compact embedded systems.
For the functionality of the CX1020 modules eight further signals have been added ( here marked with color).
|
Pin |
|
|
Row C4 |
Row D4 |
|---|---|---|---|---|
|
1 |
IOCHCHK* |
GND |
GND |
GND |
|
2 |
SD7 |
RESETDRV |
SBHE* |
MEMCS16* |
|
3 |
SD6 |
+5V |
LA23 |
IOCS16* |
|
4 |
SD5 |
IRQ9 |
LA22 |
IRQ10 |
|
5 |
SD4 |
n.c. (+12V internal) |
LA21 |
IRQ11 |
|
6 |
SD3 |
DRQ2 |
LA20 |
IRQ12 |
|
7 |
SD2 |
n.c. (+5V internal) |
LA19 |
IRQ13 |
|
8 |
SD1 |
ENDXFR* |
LA18 |
IRQ14 |
|
9 |
SD0 |
+12V |
LA17 |
DACK0* |
|
10 |
IOCHRDY |
(KEY)² |
MEMR* |
DRQ0 |
|
11 |
AEN |
SMEMW* |
MEMW* |
DACK5* |
|
12 |
SA19 |
SMEMR* |
SD8 |
DRQ5 |
|
13 |
SA18 |
IOW* |
SD9 |
DACK6* |
|
14 |
SA17 |
IOR* |
SD10 |
DRQ6 |
|
15 |
SA16 |
DACK3* |
SD11 |
DACK7* |
|
16 |
SA15 |
DRQ3 |
SD12 |
DRQ7 |
|
17 |
SA14 |
DACK1* |
SD13 |
+5V |
|
18 |
SA13 |
DRQ1 |
SD14 |
MASTER* |
|
19 |
SA12 |
REFRESH* |
SD15 |
GND |
|
20 |
SA11 |
SYSCLK |
(KEY)² |
GND |
|
21 |
SA10 |
IRQ7 |
-- |
-- |
|
22 |
SA9 |
IRQ6 |
-- |
-- |
|
23 |
SA8 |
IRQ5 |
-- |
-- |
|
24 |
SA7 |
IRQ4 |
-- |
-- |
|
25 |
SA6 |
IRQ3 |
-- |
-- |
|
26 |
SA5 |
DACK2* |
-- |
-- |
|
27 |
SA4 |
TC |
-- |
-- |
|
28 |
SA3 |
BALE |
-- |
-- |
|
29 |
SA2 |
+5V |
-- |
-- |
|
30 |
SA1 |
OSC |
-- |
-- |
|
31 |
SA0 |
GND |
-- |
-- |
|
32 |
GND |
GND |
-- |
-- |
Remarks:
1. B10 and C19 are key locations.
2. Signal timing and function are as specified in ISA specification.
3. Signal source/sink current differ from ISA values.
4. Negative voltages are not supported.
5. in the specification the pins are counted from 0 to 19
Assignment on the 8 additional pins
|
Pin number (yellow fields) |
|
|
|---|---|---|
|
1 |
LAN TX- |
LAN TX+ |
|
2 |
LAN RX- |
LAN RX+ |
|
3 |
USB D- |
USB D+ |
|
4 |
SMBDAT |
SMBCLK |
Note:
Further information to PC104 Bus can be found in the datasheet or under http://www.pc104.org.