DSP56303 datasheet(61/292 Pages) FREESCALE

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Operating Modes

DSP56303 User’s Manual, Rev. 2

Freescale Semiconductor

4-3

010

$FF0000

HI08 bootstrap in HC11 nonmultiplexed mode

The bootstrap program sets the host interface to interface with

the Freescale HC11 microcontroller through the HI08. The

HOST HC11 bootstrap code expects to read a 24-bit word

specifying the number of program words, a 24-bit word

specifying the address to start loading the program words and

then a 24-bit word for each program word to be loaded. The

program words are stored in contiguous P RAM memory

locations starting at the specified starting address. After reading

the program words, program execution starts from the same

address where loading started. The Host Interface bootstrap

load program may be stopped by setting the Host Flag 0 (HF0).

This starts execution of the loaded program from the specified

starting address.

011

$FF0000

HI08 bootstrap in 8051 multiplexed bus mode

The bootstrap program sets the host interface to interface with

the Intel 8051 bus through the HI08. The HI08 pin configuration

is optimized for connection to the Intel 8051 multiplexed bus, in

double-strobe pin configuration. The HOST 8051 bootstrap code

expects accesses that are byte wide. The HOST 8051 bootstrap

code expects to read 3 bytes forming a 24-bit word specifying

the number of program words, 3 bytes forming a 24-bit word

specifying the address to start loading the program words and

then 3 bytes forming 24-bit words for each program word to be

loaded. The program words are stored in contiguous PRAM

memory locations starting at the specified starting address. After

reading the program words, program execution starts from the

same address where loading started. The Host Interface

bootstrap load program may be stopped by setting the Host Flag

0 (HF0). This starts execution of the loaded program from the

specified starting address. The base address of the HI08 in

multiplexed mode is $80 and is not modified by the bootstrap

code. All the address lines are enabled and should be connected

accordingly.

$FF0000

HI08 bootstrap in MC68302 bus mode

The bootstrap program loads the program RAM from the Host

Interface programmed to operate in the MC68302 bus mode, in

single-strobe pin configuration. The HOST MC68302 bootstrap

code expects accesses that are byte wide. The HOST MC68302

bootstrap code expects to read 3 bytes forming a 24-bit word

specifying the number of program words, 3 bytes forming a

24-bit word specifying the address to start loading the program

words and then 3 bytes forming 24-bit words for each program

word to be loaded. The program words are stored in contiguous

PRAM memory locations starting at the specified starting

address. After reading the program words, program execution

starts from the same address where loading started. The Host

Interface bootstrap load program may be stopped by setting the

Host Flag 0 (HF0). This starts execution of the loaded program

from the specified starting address.

Table 4-1. DSP56303 Operating Modes (Continued)

Mode

MODD

MODC

MODB

MODA

Reset

Vector

Description

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