National Instruments Signal Processing Engineering Educational Device NI SPEEDY-33 - Manual (Page 20)

Chapter 2 NI SPEEDY-33 Functional Description and Interface
NI SPEEDY-33 User Manual 2-8 ni.com
Stereo A/D, D/A (Analog Input, Analog Output)
The 16-bit stereo audio CODEC included on the NI SPEEDY-33 allows
for up to 48 kHz dual-channel sampling on the input signal. Software
components are included in the LabVIEW DSP Module to allow 8 kHz,
18 kHz, 24 kHz, 36 kHz, and 48 kHz sample rates to be used in
applications.
Refer to the Audio Input Level Jumpers section for information on jumper
settings that configure the amount of gain, from the onboard or external
microphones, applied to the input audio signals.
I/O Connectors
Simple Expansion Digital I/O Connector
The simple 20-pin expansion header (J11) allows for easy interface to
external hardware. The header includes power, ground, eight digital inputs,
and eight digital outputs under DSP control.
The eight input bits are co-mapped to the switch input port. The
eight output bits are co-mapped to the digital output port LEDs, as
described in the
Digital Output Port LEDs section.
If the input bits on this connector will be used by an external piece of
hardware, the switch input port—described in the
Switch Input Port
section—must have all the switches set in the OFF (open) position
(all switches up, away from device). An ON (closed) switch position
(switch down, towards the device) will effectively short that specific input
bit to ground. Switch 1 correlates to IN1 on the connector, switch 2
correlates to IN2, and so on. The connector pinout is shown in Figure 2-4.
Figure 2-4. Simple Expansion Digital I/O Connector (J11)
19 20
17 18
15 16
13 14
11 12
9 10
7 8
5 6
3 4
1 2 3 V (Out)
OUT1 (Out)
OUT2 (Out)
OUT3 (Out)
OUT4 (Out)
OUT5 (Out)
OUT6 (Out)
OUT7 (Out)
OUT8 (Out)
ResetLow (In) 5 V (Out)
IN1 (In)
IN2 (In)
IN3 (In)
IN4 (In)
IN5 (In)
IN6 (In)
IN7 (In)
IN8 (In)
GND