Advantech PCI-1720U Manual de usuario descargar pdf (Pagina 25)

19 Chapter 4

4.2 I/O Port Address Map

PCI-1720U requires 12 addresses in the PC’s I/O space. The address of

each register is specified as an offset from the card’s base address. For

example, BASE + 0 is the card’s base address and BASE + 7 is the base

address plus seven bytes. Table 4.1 shows the function of each register

and its address relative to the card’s base address

* "R" means readable and "W" means writable

Table 4.1: PCI-1720U Register Format and Function Description

Base

Address

+ Decimal

7 6 5 4 3 2 1 0 Function

Description

R/W

+0 D7 D6 D5 D4 D3 D2 D1 D0 D/A output

channel 0

+1 D11 D10 D9 D8

+2 D7 D6 D5 D4 D3 D2 D1 D0 D/A output

channel 1

+3 D11 D10 D9 D8

+4 D7 D6 D5 D4 D3 D2 D1 D0 D/A output

channel 2

+5 D11 D10 D9 D8

+6 D7 D6 D5 D4 D3 D2 D1 D0 D/A output

channel 3

+7 D11 D10 D9 D8

+8 D/A voltage

range and polar-

ity

R/W

+9 Synchronized

output prompt

+15 SC0 Synchronized

output control bit

R/W

+20 D3 D2 D1 D0 BoardID Regis-

ter

1 2 ... 20 21 22 23 24 25 26 27 28 29 30 ... 37 38

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Advantech PCI-1720U Manual de usuario Pagina 25