Analog Output Pacing And Triggering; Digital Input/Output - Measurement Computing PCI-DAS64/M1/16 User Manual

PCI-DAS64/M1/16 User's Guide

Analog output pacing and triggering

D/A pacing
(software-programmable)
D/A gate sources
(software-programmable)
D/A gating modes
D/A trigger sources
D/A triggering modes
Data transfer

Digital input/output

Digital type (main connector)
Configuration
Output high voltage (IOH = -0.4 mA)
Output low voltage (IOL = 8 mA)
Input high voltage
Input low voltage
Digital type (digital I/O connector)
Number of I/O
Configuration
Input high voltage
Input low voltage
Output high voltage (IOH = -2.5 mA)
Output low voltage (IOL = 2.5 mA)
Power-up / reset state
SSH output
SSH polarity
Table 12. Analog output pacing and triggering specifications
Internal counter – ASIC
External source (D/A external pacer)
Software paced
External digital (external D/A trigger/pacer gate)
External analog (analog trigger in)
External digital: Programmable, active high or active low, level or edge
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)
Software triggered
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
100 kS/s max per channel
Table 13. Digital I/O specifications
Output: 74LS175
Input: 74LS244
Four inputs, four outputs (DIN0 through DIN3; DOUT0 to DOUT3)
2.7 V min
0.5 V max
2.0 V min, 7 volts absolute max
0.8 V max, –0.5 volts absolute min
82C55
24 (FIRSTPORTA Bit 0 through FIRSTPORTC Bit 7)
2 banks of 8 and 2 banks of 4, or
3 banks of 8 or
2 banks of 8 with handshake
2.0 V min, 5.5 V absolute max
0.8 V max, –0.5 V absolute min
3.0 V min
0.4 V max
Input mode (high impedance)
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.
HOLD high (default) or HOLD low, software selectable
6-8
Specifications