VisualDSP++ 4.5 Loader and Utilities Manual - Analog Devices

ADSP-21161 Processor Booting
ADSP-21161 Processor Booting
ADSP-21161 processors support five boot modes: EPROM, host, link
port, SPI port, and no-boot (see Table 4-1 and Table 4-2 on page 4-4.)
Boot-loadable files for these modes pack boot data into words of appropriate
widths and use an appropriate DMA channel of the processor’s DMA
controller to boot-load the words.
When booting from an EPROM through the external port, the
ADSP-21161 processor reads boot data from an 8-bit external
EPROM.
When booting from a host processor through the external port, the
ADSP-21161 processor accepts boot data from 8- or 16-bit host
microprocessor.
When booting through the link port, the ADSP-21161 processor
receives boot data through the link port as 4-bit wide data in link
buffer 4.
When booting through the SPI port, the ADSP-21161 processor
uses DMA channel 8 of the IO processor to transfer instructions to
internal memory. In this boot mode, the processor receives data in
the SPIRx register.
In no-boot mode, ADSP-21161 processors begin executing
instructions from external memory.
Software developers who use the loader utility should be familiar with the
following operations:
“Power-Up Booting Process” on page 4-3
“Boot Mode Selection” on page 4-4
“ADSP-21161 Processor Boot Modes” on page 4-5
“ADSP-21161 Processor Boot Kernels” on page 4-16
4-2 VisualDSP++ 4.5 Loader and Utilities Manual