1 i/o port base address, I/o port base address, Table 3-1: i/o port base address – ADLINK PCI-7300A User Manual
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Registers
3.1 I/O Port Base Address
The registers of the cPCI/PCI-7300A are shown in Table 3.1. The
base address of these registers is also assigned by the PCI P&P
BIOS. The assigned base address is stored at offset 18h of the
PCR. Therefore, users can read the PCR to know the base
address by using BIOS function call. Note that the cPCI/PCI-
7300A registers are all 32 bits. Users should access these regis-
ters by 32 bits I/O instructions.
The PCI-7300A occupies 8 consecutive 32-bit I/O addresses in
the I/O address space. Table 3.1 shows the I/O Map of the PCI-
7300A rev.B.
Address
Read
Write
Base + 0
DI_CSR
DI_CSR
Base + 4
DO_CSR
DO_CSR
Base + 8
AUX_DIO
AUX_DIO
Base + C
INT_CSR
INT_CSR
Base + 10
DI_FIFO
DI_FIFO
Base + 14
DO_FIFO
DO_FIFO
Base + 18
-
FIFO_CR
Base + 1C
POL_CTRL
POL_CTRL
Base + 20
8254_COUNT0
8254_COUNT0
Base + 24
8254_COUNT1
8254_COUNT1
Base + 28
8254_COUNT2
8254_COUNT2
Base + 2C 8254_CONTROL 8254_CONTROL
Table 3-1: I/O Port Base Address