D/A Output Register. HP (Hewlett-Packard) NuDAQ PCI-9111HR, PCI-9111DG/HR

Bit 7 6 5 4 3 2 1

Base + 2h DI7 DI6 DI5 DI4 DI3 DI2 DI1

Base + 3h DI15 DI14 DI13 DI12 DI11 DI10 DI9

Address: BASE + 2h

0

DI0

DI8

Attribute: write only

Data Format:

Bit 7 6 5 4 3 2 1 0

Base + 2h DO7 DO6 DO5 DO4 DO3 DO2 DO1 DO0

Base + 3h DO15 DO14 DO13 DO12 DO11 DO10 DO9 DO8

3.15 D/A Output Register

The D/A converter will convert the D/A output digital data to analog signal.

Address: BASE + 0

Attribute: write only

Data Format: (for D/A Channel 1)

Bit 7 6 5 4 3 2 1 0

Base + 0 DA7 DA6 DA5 DA4 DA3 DA2 DA1 DA0

Base + 1 --- --- --- --- DA11 DA10 DA9 DA8

DA0 is the LSB and DA11 is the MSB of the 12 bits data.

---: don't care

3.16 Timer/Counter Register

Each 82C54 chip occupies 4 I/O address locations in the PCI-9111 as shown blow. Users can refer to 82C54 data sheet for the descriptions about all the features of 82C54. You can download the data sheet on the following web site:

“http://support.intel.com/support/controllers/peripheral/231164.htm” or “http://www.tundra.com/”

Address: BASE + 40h ~ BASE + 46h

Attribute: read / write

Data Format:

Base + 40h

Base + 42h

Counter 0 Register (R/W)

Counter 1 Register (R/W)

Base + 44h

Base + 46h

Counter 2 Register (R/W)

8254 CONTROL BYTE (W)

Registers Format • 21