Motorola DSP56156 Manual page 274

The lowest cost DSP56156-based system is shown in Figure B-1. This system uses no
run time external memory and requires only two chips; the DSP56156 and a low cost
EPROM.
Figure B-2 shows the DSP56156 bootstrapping via the Host Interface from an MC68000.
Note: When in RESET,
IRQA and IRQB must
be deasserted by external
peripherals.
FROM OPEN
COLLECTOR
BUFFER
FROM
RESET
FUNCTION
FROM OPEN
COLLECTOR
BUFFER
Figure B-1 No Glue Logic, Low Cost Memory Port Bootstrap — Mode 0
+5 V
15K
FROM OPEN
COLLECTOR
BUFFER
FROM
RESET
FUNCTION
FROM OPEN
COLLECTOR
BUFFER
Figure B-2 DSP56156 Host Bootstrap Example — Mode 1
MOTOROLA
+5 V
15K 15K 15K
MBD301
MBD301
15K 15K 15K 15K
DSP56156
BR
HACK
MODA/IRQA
MBD301
RESET
MBD301
MODB/IRQB
MODC
D15
15K
DSP56156 APPLICATION EXAMPLES
+5 V
15K
DSP56156
BR
MODA/IRQA
HACK
RD
A0-A10
RESET
D0-D7
MODC
TA
MODB/IRQB
HEN
F32
F32
LS09
F32
HR/W
F32
8
H0-H7
3
HA0-HA2
+5 V
15K
2732
OE
11
A0-A10
8
D0-D7
CS
LDS
AS
ADDRESS
DECODE A4-A23
MC68000
+5 V
(12.5MHz)
1K
DTACK
R/W
D0-D7
A1-A3
B - 3