Registers – ADLINK PCI-7258 User Manual

Page 23

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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

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Table 2. Registers Address Map

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