dsp56001 Freescale Semiconductor, Inc, dsp56001 Datasheet - Page 48

• Manufacturer Part Number: dsp56001
• Description: Available In An 88 Pin Ceramic Through-hole Package.
• Manufacturer: Freescale Semiconductor, Inc

FROM OPEN
COLLECTOR
BUFFER
FROM OPEN
COLLECTOR
BUFFER
FROM
RESET
FUNCTION
MOTOROLA
B-48
The lowest cost DSP56001 based system is shown in Figure B-
1. It uses no run time external memory and requires only two
chips, the DSP56001 and a low cost EPROM. The EPROM read
access time should be less than 780 nanoseconds when the
DSP56001 is operating at a clock rate of 20.5 MHz.
Note: When in RESET,
IRQA and IRQB must
be deasserted by external
peripherals.
FROM OPEN
COLLECTOR
BUFFER
FROM OPEN
COLLECTOR
BUFFER
FROM
RESET
FUNCTION
15K
+5 V
15K
Figure B-2. Port A Bootstrap with External Data RAM — Mode 1
Figure B-1. No Glue Logic, Low Cost Memory Port Bootstrap — Mode 1
15K
15K
MBD301
MBD301
+5 V
15K
15K
APPLICATION EXAMPLES
*
*
15K
BR
HACK
MODA/IRQA
MODB/IRQB
RESET
15K
DSP56001
MBD301
MBD301
APPENDIX B
+5 V
15K
*
*
D0-D23
A0-A10
D23
MODA/IRQA
MODB/IRQB
RESET
A system with external data RAM memory requires no glue logic
to select the external EPROM from bootstrap mode. PS is used
to enable the EPROM and DS is used to enable the high speed
data memories as shown in Figure B-2.
X/Y
WR
RD
DS
PS
DSP56001
15K
+5 V
CE
11
D23
A0-A10
2716
HACK
D0-D7
BR
PS
A0-A10
D0-D7
Note *: These diodes must be Schottky diodes.
8
+5 V
Note *: These diodes must be Schottky diodes.
15K
10
11
+5 V
8
15K
D0-D7
CE
A0-A10
A0-A9 A10 CS WE OE
2716
2018-55 (3)
D0-D23
DSP56001
24