Measurement-computing PCI-DAS6402/16 Manual de usuario descargar pdf (Pagina 27)

PCI-DAS6402/16 User's Guide Specifications

Digital input/output

Table 13. Digital input/output specifications (main connector)

Output: 74LS175

Digital type (main connector)

Input: 74LS244

Configuration 4 inputs, 4 outputs (DIN0 through DIN3; DOUT0 to DOUT3)

Output high voltage (IOH = -0.4 mA) 2.7 V min

Output low voltage (IOL = 8 mA) 0.5 V max

Input high voltage 2.0 V min, 7 volts absolute max

Input low voltage 0.8 V max, –0.5 volts absolute min

Table 14. Digital input/output specifications (DIO connector)

Digital type (digital I/O connector) 82C55

Number of I/O 24 (FIRSTPORTA Bit 0 through FIRSTPORTC Bit 7)

Configuration

! 2 banks of 8 and 2 banks of 4 or

! 3 banks of 8 or

! 2 banks of 8 with handshake

Input high voltage 2.0 V min, 5.5 V absolute max

Input low voltage 0.8 V max, –0.5 V absolute min

Output high voltage (IOH = -2.5 mA) 3.0 V min

Output low voltage (IOL = 2.5 mA) 0.4 V max

Power-up / reset state Input mode (high impedance)

Table 15. Simultaneous sample and hold specifications

SSH output

TTL-compatible output, HOLD is asserted from start of the conversion for

Channel 0 through conversion of the last channel in the scan. Available at user

connector (SSH OUT / D/A PACER OUT). This pin is software selectable as

SSH OUT or D/A PACER OUT.

SSH polarity HOLD high (default) or HOLD low, software selectable

Interrupts

Table 16. 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 sources

(sw programmable)

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

(sw 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.

5-6

1 2 ... 22 23 24 25 26 27 28 29 30 31 32 33 34

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