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Interrupts, Counters, Interrupts -9 – Measurement Computing PCI-DAS64/M2/16 User Manual

Page 30: Counters -9

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PCI-DAS64/M2/16 User's Guide

Specifications

Interrupts

Table 14. Interrupt specifications

Interrupts

PCI INTA# - Mapped to IRQn via PCI BIOS at boot-time

Interrupt enable

Programmable through PLX9080
DAQ_ACTIVE:

Interrupt is generated when a DAQ sequence is active.

DAQ_STOP:

Interrupt is generated when A/D Stop Trigger In is detected.

DAQ_DONE:

Interrupt is generated when a DAQ sequence completes.

DAQ_FIFO_1/4_FULL:

Interrupt is generated when ADC FIFO is ¼ full.

DAQ_SINGLE:

Interrupt is generated after each conversion completes.

DAQ_EOSCAN:

Interrupt is generated after the last channel is converted in
multi-channel scans.

ADC interrupt

DAQ_EOSEQ:

Interrupt is generated after each interval delay during multi-
channel scans.

DAC_ACTIVE:

Interrupt is generated when DAC waveform circuitry is active.

DAC_DONE:

Interrupt is generated when a DAC sequence completes.

DAC_FIFO_1/4_EMPTY: Interrupt is generated DAC FIFO is ¼ empty.
DAC_HIGH_CHANNEL: Interrupt is generated when the DAC high channel output is

updated.

DAC interrupt sources
(software-programmable)

DAC_RETRANSMIT:

Interrupt is generated when the end of a waveform sequence
has occurred in retransmit mode.

External interrupt

Interrupt is generated via edge-sensitive transition on the External Interrupt pin.
Rising/falling edge polarity software selectable.

Counters

Table 15. Counter specifications

User counter type

82C54

Configuration

One down counter, 16-bits. Counters 2 and 3 not used.

Counter 1 source

External, from connector (CTR1 CLK)

Counter 1 gate

Available at connector (CTR1 GATE).

Counter 1 output

Available at connector (CTR1 OUT).

Clock input frequency

10 MHz max

High pulse width
(clock input)

30 nS min

Low pulse width
(clock input)

50 nS min

Gate width high

50 nS min

Gate width low

50 nS min

Input low voltage

0.8 V max

Input high voltage

2.0 V min

Output low voltage

0.4 V max

Output high voltage

3.0 V min

6-9

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