Motorola DSP56156 Manual page 276

Figure B-4 is a simple manual reset circuit and Figure B-5 adds the ability to remotely re-
set the DSP.
1N4148
•
MASTER
RESET
LOGIC
RESET
MOTOROLA
+5V
•
47 K Ω
1N4148
• •
10 µ f
•
Figure B-4 Reset Circuit
+5V
•
555 TIMER
47 K Ω
4
RESET
2
•
• TRIGGER
3
1 µ f
OUTPUT
•
74LS04
Figure B-5 Reset Circuit Using 555 Timer
DSP56156 APPLICATION EXAMPLES
RESET
Notes: 1. IRQA and IRQB must be hardwired.
2. MODA and MODB must be hard wired.
+5V
1 M Ω
6
THRESHOLD
•
7
DISCHARGE
•
5
CONTROL
0.1 µ f 0.47 µ f
•
RESET
OnCE Connector
Reset_IN
B - 5