ADLINK PCI-7256 - Manual (Page 24)

16 • Register Format
3
Register Format
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