Kontron PB-SIO4A - Manual (Page 25)

PB-SIO4A Configuration
ID 19958, Rev. 0300 Page 3 - 3 ® PEP Modular Computers GmbH
3. Configuration
3.1 PB-SIO4A Address Map and ID Byte
The PB-SIO4A is addressed (odd byte access) by using the carrier board base address
and one of the following offsets for the piggyback location:
Piggyback location A ( the upper position on the carrier board)
Base Address + $01 DUART1
Base Address + $21 DUART2
Base Address + $41 ID Byte
Piggyback location B ( the lower position on the carrier board)
Base Address + $81 DUART1
Base Address + $A1 DUART2
Base Address + $C1 ID Byte
The PB-SIO4A has an ID Byte of $E7 (RS422/RS485).
3.2 VMEbus Interrupts
Each DUART device is able to issue an interrupt request (*IRQ) to the carrier board. In
the event of simultaneous interrupt requests those from DUART #1 have priority over
those from DUART #2.
The interrupt level is set by the carrier board. See the carrier board documentation for
setting of the level. The interrupt vector itself is provided by the DUART.