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Analog output pacing and triggering, Digital input/output, Analog output pacing and triggering -8 – Measurement Computing PCI-DAS64/M2/16 User Manual

Page 29: Digital input/output -8

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PCI-DAS64/M2/16 User's Guide

Specifications

Analog output pacing and triggering

Table 12. Analog output pacing and triggering specifications

Internal counter – ASIC
External source (D/A external pacer)

D/A pacing
(software-programmable)

Software paced
External digital (external D/A trigger/pacer gate)

D/A gate sources
(software-programmable)

External analog (analog trigger in)
External digital: Programmable, active high or active low, level or edge

D/A gating modes

External analog: Software-configurable for above or below reference. Gating levels are
set by DAC0 or DAC1.
External digital (external D/A trigger/pacer gate)

D/A trigger sources

Software triggered

D/A triggering modes

External digital: Software-configurable for rising or falling edge.
From 16 k RAM buffer via DMA (demand or non-demand mode) using scatter gather.
Programmed I/O

Data transfer

100 kS/s max per channel

Digital input/output

Table 13. Digital I/O specifications

Output: 74LS175

Digital type (main connector)

Input: 74LS244

Configuration

Four inputs, four 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

Digital type (digital I/O connector)

82C55

Number of I/O

24 (FIRSTPORTA Bit 0 through FIRSTPORTC Bit 7)
2 banks of 8 and 2 banks of 4, or
3 banks of 8 or

Configuration

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)

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 (default) or D/A PACER OUT.

SSH polarity

HOLD high (default) or HOLD low, software selectable

6-8

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