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PIO-D48 Series Card
48-channel OPTO-22 Compatible DIO Board
User Manual/Ver. 3.4/Aug. 2015/PMH-006-34/Page: 37
6.3
The I/O Address Map
The I/O address for PIO-D48 series cards are automatically assigned by the main board ROM BIOS.
The I/O address may also be re-assigned by the user. It is strongly recommended that users do not
change the I/O address. The Plug&Play BIOS will effectively perform the assignment of proper I/O
addresses to each PIO-D48 series card. The I/O address for the PIO-D48/D48U/D48SU and PEX-D48
are given in the table below, all of which are based on the base address of each card.
Table 6-4: Refer to
Sec. 6.1
for more information about wBase.
Address
Read
Write
wBase+0
-
RESET\ Control Register
wBase+5
INT mask control register
Same
wBase+7
Aux pin status register
Same
wBase+0x2a
INT polarity control register
Same
wBase+0xc0
Read Port0 (PA)
Write Port0 (PA)
wBase+0xc4
Read Port1 (PB)
Write Port1 (PB)
wBase+0xc8
Read Port2 (PC)
Write Port2 (PC)
wBase+0xcc
-
Write Control Word (Port 0/1/2)
wBase+0xd0
Read Port3 (PA)
Write Port3 (PA)
wBase+0xd4
Read Port4 (PB)
Write Port4 (PB)
wBase+0xd8
Read Port5 (PC)
Write Port5 (PC)
wBase+0xdc
-
Write Control Word (Port 3/4/5)
wBase+0xe0
Read 8254-Counter0
Write 8254-Counter0
wBase+0xe4
Read 8254-Counter1
Write 8254-Counter1
wbase+0xe8
Read 8254-Counter2
Write 8254-Counter2
wBase+0xec
Read 8254 Control Word
Writer 8254 Control Word
wBase+0xf0
Read Clock/Int Control Word
Write Clock/Int Control Word
wBase+0xf4
Read Card ID
-