Analog Devices VISUALDSP++ 3.5, Manual

Page: 61 / 166

Vi+ Loader Manual 2-31
for 16-Bit Processors
Blackfin Processor Loader/Splitter
For the
.DXE
count block, the address field is irrelevant since the block is
not going to be copied to memory. The “ignore bit” is set in the flag word
of this header, so the boot loader does not try to load the
.DXE
count but
skips the count. For more details, see “Flags of Block Header” on
page 2-20
Following the .
DXE
count block are the rest of the blocks of the first .
DXE
.
A bit-by-bit description of the boot steam is presented in Table 2-7 .
When learning about the ADSPP-BF561 boot stream structure, keep in
mind that the count byte for each
.DXE
is, itself, a block encapsulated by a
block header.
Table 2-7. ADSP-BF561 Processor Boot Stream Structure
Bit Field Description
0–7 LSB of the Global Header
8–15 8-15 of the Global Header
16–23 16-23 of the Global Header
24–31 MSB of the Global Header
32–39 LSB of the address field of 1st DXE count block (no care)
40–47 8-15 of the address field of 1st DXE count block (no care)
48–55 16-23 of the address field of 1st DXE count block (no care)
56–63 MSB of the address field of 1st DXE count block (no care)
64–71 LSB (4) of the byte count field of 1st DXE count block
72–79 8-15 (0) of the byte count field of 1st DXE count block
80–87 16-23 (0) of the byte count field of 1st DXE count block
88–95 MSB (0) of the byte count field of 1st DXE count block
96–103 LSB of the flag word of 1st DXE count block – ignore bit set
104–111 MSB of the flag word of 1st DXE count block
112–119
LSB of the first 1st
.DXE
byte count