Measurement Computing PCI-DAS1602/12 - Manual (Page 26)

PCI-DAS1602/12 User's Guide Specifications
25
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