Digital input/output

PC-CARD-DAS16/12AO User's GuideSpecifications

	Table 9. DIO specifications

Digital type		FPGA
Number of I/O		4
Configuration		One port, programmable
		4 input / 4 output
Input low voltage		0.8 V max
Input high voltage		2.0 V min
Output low voltage (IOL = 4 mA)		0.32 V max
Output high voltage (IOH = -4 mA)		3.86 V min
Absolute maximum input voltage		-0.5 V , +5.5 V
Power-up / reset state		Input mode (high impedance)

Interrupt

	Table 10. Interrupt specifications

Interrupts		Programmable: Levels 2 – 15
Interrupt enable		Programmable. Default = disabled.
Interrupt sources		External (External Interrupt)
		A/D End-of-channel-scan
		A/D FIFO-not-empty
		A/D FIFO-half-full
		A/D Pacer

Counter type	82C54
Configuration	3 down counters, 16 bits each
Counter 1 - User counter	Source:	Programmable external (Ctr 1 Clk) or 100kHz internal source
	Gate:	Available at connector (Ctr 1 Gate), pulled to logic high via 10K
	resistor. See Note 2.
	Output:	Available at connector (Ctr 1 Out)
Counter 2 - ADC Pacer Lower Divider	Source:	Programmable, 1MHz or 10 MHz internal source
	Gate:	Available at connector (A/D Pacer Gate), pulled to logic high
	via 10K resistor.
	Output:	Chained to Counter 3 Clock
Counter 3 - ADC Pacer Upper Divider	Source:	Counter 2 Output
	Gate:	Internal
	Output:	Programmable as ADC Pacer clock. Available at user connector
	(ADC Pacer out)
Clock input frequency	10 MHz max
High pulse width (clock input)	30 ns min
Low pulse width (clock input)	50 ns min
Gate width high	50 ns min
Gate width low	50 ns min
Input low voltage	0.8 V max
Input high voltage	2.0 V min
Output low voltage	0.4 V max
Output high voltage	3.0 V min
Crystal oscillator frequency	10 MHz