Determining Boot Modes - Analog Devices VisualDSP++ 3.5 Manual

ADSP-218x DSP Loader Guide
Refer to "No Booting" on page 5-13
mode.

Determining Boot Modes

To determine the boot mode, an ADSP-218x DSP samples its mode pins
(input flag pins) after reset.
figure various DSPs by pulling the proper pins up or down.
Table 5-1. Boot Modes: ADSP-2181 and ADSP-2183 DSPs
MMAP BMODE
Pin Pin
0 0
0 1
1 X
Table 5-2. Boot Modes: ADSP-2184 to ADSP-2189 DSPs
Mode D Mode C Mode B
X
0
X
0
5-4
Table 5-1
Description
BDMA is used in default mode to load the first 32 program memory words
from byte memory space. Program execution is held off until all 32 words
have been loaded.
IDMA is used to load any internal memory as desired. Program execution is
held off until internal program memory location 0 is written to.
Bootstrap is disabled. Program execution immediately starts from location
Mode A
Description
BDMA is used to load the first 32 program memory
0 0
words from byte memory space. Program execution is
held off until all 32 words have been loaded. The chip
is configured in Full Memory Mode.
No automatic boot operations occur. Program execu-
1 0
tion starts at external memory location 0. The chip is
configured in Full Memory Mode. BDMA can still be
used, but the processor does not automatically use or
wait for these operations.
for a detailed discussion of this
and Table 5-2 explain how to con-
VisualDSP++ 3.5 Loader Manual
for 16-Bit Processors
.
0
1