ADLINK PCI-7258 - Manual (Page 23)

Registers • 15
3
Registers
Detailed descriptions of the registers are specified in this chapter. This
information is useful for programmers who wish to handle the card with low-
level programming. However, we suggest users to have an understanding of
the PCI interface before starting any low-level programming.
3.1 I/O Address Map
The PCI-7258 registers are all 16-bits long. Users can access these
registers by 16-bit I/O instructions only. The controls for the relays and
status of the isolated inputs are by means of accessing these registers. The
following table shows the registers mapping addresses; the addresses are
offset relative to the base address.
Offset Write Read
0x00h Relay Output CH. 1~16
Relay Output Read back
CH.1~16
0x02h Relay Output CH. 17~32
Relay Output Read back
CH.17~32
0x04h --- Isolated Input CH. 0, 1
0x08h Clear IRQ ---
Table 2. Registers Address Map