Measurement-computing PCI-DAS1602/12 Manuel d'utilisateur télécharger pdf (Page 26)

PCI-DAS1602/12 User's Guide Specifications

Interrupts

Table 11. Interrupt specifications

Interrupt

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

PCI Interrupt enable

Programmable

Interrupt sources

 External (rising TTL edge event)

 Residual sample counter

 A/D end of conversion

 A/D end of channel scan

 A/D FIFO-not-empty

 A/D FIFO-half-full

 D/A FIFO-not-empty

 D/A FIFO-half-full

Counters

Table 12. Counter specifications

Counter type

82C54

Configuration

Two 82C54 devices. 3 down counters per 82C54, 16 bits each

Counter 1 — ADC residual sample

counter

Source: ADC Clock

Gate: Programmable source

Output: End-of-Acquisition interrupt source

Counter 2 — ADC pacer lower divider

Source: Internal 10 MHz

Gate: Tied to counter 3 gate, programmable source.

Output: Chained to counter 3 clock

Counter 3 — ADC pacer upper divider

Source: Counter 2 output

Gate: Tied to counter 2 gate, programmable source

Output: ADC Pacer clock (if software selected), available at user

connector

Counter 4 — Pre-trigger mode

Source: ADC Clock

Gate: A/D External Trigger

Output: End-of-Acquisition interrupt source

Counter 4 — Non pre-trigger mode

Source: User input at 100-pin connector (CLK 4) or internal 10 MHz

(software selectable)

Gate: User input at 100-pin connector (GATE 4)

Output: Available at 100-pin connector (OUT 4)

Counter 5 — DAC pacer lower divider

Source: Internal 10 MHz

Gate: Tied to counter 6 gate, programmable source.

Output: Chained to counter 6 clock

Counter 6 — DAC pacer upper divider

Source: Counter 5 output

Gate: Tied to Counter 5 gate, programmable source.

Output: DAC Pacer clock, available at user connector

(D/A INTERNAL PACER OUTPUT)

Gate width high

50 ns min

Gate width low

50 ns min

Input high

2.0 volts min, 5.5 volts absolute max

Input low

0.8 volts max, -0.5 volts absolute min

Output high

3.0 volts min @ -2.5 mA

Output low

0.4 volts max @ 2.5 mA

Crystal oscillator frequency

10 MHz

1 2 ... 21 22 23 24 25 26 27 28 29 30 31

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