Adlink PCI-7256 Manual do Utilizador descarregar pdf (Página 24)

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The detailed descriptions of the register format are specified in this chapter.

This information is quite useful for the programmers who want to handle the

card by low-level programming. However, we suggest user understand more

about the PCI interface before starting low-level programming.

3.1 I/O Address Map

The 7256 registers are all 16-bit wide. Users can access these registers only

by 16 bits I/O instructions. The control of the relays and status of the

isolation input is by means of accessing registers. The following table shows

the register map, including descriptions and their offset addresses relative to

the base address.

Table 3.1 The register map of PCI-7256

Offset Write Read

0x00h Relay Output CH. 0~7 --

0x02h

Relay Output CH. 8~15

Relay Output Read back

CH.0~15

0x04h --- Isolated Input CH. 0~15

0x06h COS Setup Register COS Latch Register

0x08h Interrupt Control Register Interrupt Status Register

1 2 ... 19 20 21 22 23 24 25 26 27 28 29 ... 47 48

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