dsp56001 Freescale Semiconductor, Inc, dsp56001 Datasheet - Page 59

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

DSP56001
INITIALIZE ADDRESS
(INDICATES A BOOT
GET P:$C000 BIT 23
AND PUT IT IN THE
FROM EXTERNAL
SET L FLAG = 1
P:$C000 BIT 23
MEMORY WAS
CARRY FLAG
ITERATIONS
REGISTERS
SELECTED)
START DO
R2=$FFE9
LOOP , 512
R1=$C000
START
R0=0
WAS
N
=0?
512 PROGRAM WORDS
HAVE BEEN LOADED
REPEAT UNTIL
EXTERNAL
MEMORY
INTERFACE
HOST
Y
Figure E-1. Bootstrap Program Flowchart
N
P MEMORY LOCATION.
FROM P MEMORY
AND SHIFT INTO
SET OPERATING
(GET 8-BIT DATA
INCREMENT R1
ACCUMULATOR
GET 8-BIT DATA
NEXT INTERNAL
FROM A3 INTO
INCREMENT R0
24-BIT WORD)
MOVE A1 INTO
SHIFT 8 BITS
A1’S 8 MSBS
512 LOOPS?
DO 3 TIMES
PUT I N A2,
3 LOOPS?
FINISHED
FINISHED
MODE TO
POINTER.
L FLAG
MODE 2
=0?
N
Y
Y
IS
LOAD FROM
EXTERNAL
MEMORY
Y
N
LOAD FROM
INTERFACE
24-BIT DATA IS IN A1
HOST
WAIT FOR
HOST TO FILL
INPUT REGISTER
REPEAT UNTIL
CONTINUE
LOADING
Y
REGISTER
STATUS
CLEAR
ACCUMULATOR A1
HOST INTERFACE
PUT DATA FROM
DATA REGISTER
HOST RECEIVE
HOST RECEIVE
HOST FLAG 0
FLAG = 0?
ENABLE
IS THE
LOGIC
INTO
N
=0?
IS
Y
DATA AVAILABLE
N
JUMP TO P:0
ENDDO
MOTOROLA
STOP BOOT
LOAD
E-59