DSP56166 APPLICATION EXAMPLES DSP56166 APPLICATION EXAMPLES
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DSP56166 APPLICATION EXAMPLES
DSP56166 APPLICATION EXAMPLES
lowest cost DSP56166-based system shown Figure B-1. uses time external memory requires only chips, DSP56166 cost EPROM. Figure shows DSP56166 bootstrapping Host Interface from MC68000.
Note: When RESET, IRQA IRQB must deasserted external peripherals. FROM OPEN COLLECTOR BUFFER
DSP56166
MODA/IRQA HACK MBD301 2732
A0-A10 RESET D0-D7 MODC
A0-A10
FROM RESET FUNCTION
MBD301
D0-D7
FROM OPEN COLLECTOR BUFFER
MODB/IRQB
Figure Glue Logic, Cost Memory Port Bootstrap Mode
DSP56166
ADDRESS DECODE A4-A23
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 HA0-HA2 H0-H7
D0-D7 A1-A3
Figure DSP56166 Host Bootstrap Example Mode
DSP56166 APPLICATION EXAMPLES
Systems with external program memory load on-chip PRAM without using bootstrap mode. Figure B-3, DSP56166 operated mode with reset vector pointed external program memory location P:$E000. programmer overlay high speed on-chip PRAM with algorithms using MOVEM instruction.
DSP56166
FROM OPEN COLLECTOR BUFFER MODA/IRQA
A0-A14 MBD301 FROM RESET FUNCTION RESET MBD301 HACK FROM OPEN COLLECTOR BUFFER MODB/IRQB MODC D0-D15
A0-A14
2756-30
D0-D15
Figure Words External Program Mode
DSP56166 APPLICATION EXAMPLES
Figure simple manual reset circuit Figure adds ability remotely reset DSP.
1N4148
Note: IRQA IRQB must hardwired.
RESET
Note: MODA MODB must hard wired.
Figure Reset Circuit
1N4148 MASTER RESET
TIMER
RESET TRIGGER OUTPUT THRESHOLD DISCHARGE CONTROL
0.47
LOGIC RESET 74LS04
RESET OnCE Connector Reset_IN
Figure Reset Circuit Using Timer
DSP56166 APPLICATION EXAMPLES
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