Analog Devices VisualDSP++ 3.5 Manual page 136

ADSP-218x DSP Loader Guide
Figure 5-1. Host Processor Algorithm
The loader generates an ASCII file (
by the following information: word count, IDMA control value, and over-
lay page number. Since the IDMA interface is a 16-bit interface, the .
file is organized in 16-bit portions.
Typically, embedded processors cannot directly process ASCII files in
format. It is up to the user to post-process this file in a customized
.IDM
way.
!
Due to hardware restrictions, IDMA booting of off-chip memories
is not possible. Refer to the description of IDMA capabilities in the
ADSP-218x DSP Hardware Reference.
5-12
Read next word count N
YES
N = = 0xFFFF?
NO
Read IDMA Control value and
perform Address Latch Cycle
Read IDMA Overlay value and
perform Address Latch Cycle
Read next 16-bit Data value
and write to IDMA
Decrement N
YES
N = = 0x0000?
DONE
Bypass this step if elfspl21has not
been invoked by the -218x switch.
NO
). Every segment data is headed
.IDM
VisualDSP++ 3.5 Loader Manual
for 16-Bit Processors
IDM