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SECTION B

DSP56166 APPLICATION EXAMPLES

SECTION B
DSP56166 APPLICATION EXAMPLES
MOTOROLA
DSP56166 APPLICATION EXAMPLES
The lowest cost DSP56166-based system is shown in Figure B-1. It uses no run time external memory and requires only two chips, the DSP56166 and a low cost EPROM. Figure B-2 shows the DSP56166 bootstrapping via the Host Interface from an MC68000.
+5 V Note: When in RESET, IRQA and IRQB must be deasserted by external peripherals. FROM OPEN COLLECTOR BUFFER
DSP56166
BR MODA / IRQA HACK RD MBD301 11 8 2732 OE
A0-A10 RESET D0-D7 MODC TA
A0-A10
FROM RESET FUNCTION
MBD301
D0-D7 CS
FROM OPEN COLLECTOR BUFFER
MODB / IRQB
Figure B-1 No Glue Logic, Low Cost Memory Port Bootstrap - Mode 0
15K BR
DSP56166
HEN F32 F32 ADDRESS DECODE LDS AS A4-A23 +5 V
FROM OPEN COLLECTOR BUFFER
HACK MODA / IRQA
MBD301 FROM RESET FUNCTION RESET MBD301 LS09
MC68000
(12.5MHz) DTACK
HR / W FROM OPEN COLLECTOR BUFFER MODB / IRQB MODC D15 15K HA0-HA2 H0-H7
R / W D0-D7 A1-A3
Figure B-2 DSP56166 Host Bootstrap Example - Mode 1
DSP56166 APPLICATION EXAMPLES
MOTOROLA
DSP56166
FROM OPEN COLLECTOR BUFFER MODA / IRQA
A0-A14 +5V MBD301 FROM RESET FUNCTION RESET MBD301 HACK +5V 15 K FROM OPEN COLLECTOR BUFFER MODB / IRQB MODC BR D0-D15
A0-A14 15 K
D0-D15
Figure B-3 32K Words of External Program ROM - Mode 2
MOTOROLA
DSP56166 APPLICATION EXAMPLES
Figure B-4 is a simple manual reset circuit and Figure B-5 adds the ability to remotely reset the DSP.
Note: IRQA and IRQB must be hardwired.
RESET
Note: MODA and MODB must be hard wired.
Figure B-4 Reset Circuit
+5V · 1N4148 · MASTER RESET · · 1 µf 47 K ·
555 TIMER
4 RESET 2 TRIGGER 3 OUTPUT THRESHOLD DISCHARGE CONTROL 6 7 5 0.1 µf · ·
0.47 µf ·
LOGIC RESET 74LS04
Figure B-5 Reset Circuit Using 555 Timer
DSP56166 APPLICATION EXAMPLES
MOTOROLA