VisualDSP++ 4.5 Loader and Utilities Manual - Analog Devices

� EE-174:
Loader for TigerSHARC Processors
In link port boot mode, the processor receives boot data via its link
port from another TigerSHARC processor.
ADSP-TS101S TigerSHARC Processor Boot Loader Kernels
Operation and EE-200: ADSP-TS20x TigerSHARC Processor Boot
Loader Kernels Operation provide additional information about the
loader. These EE notes are available from the Analog Devices Web
site:
http://www.analog.com/processors/processors/tigersharc/technicalLibrary/index.html.
Boot Type Selection
To determine the boot mode, a TigerSHARC processor samples its boot
mode select (BMS) pin. While the processor is held in reset, the BMS pin is
an active input.
If BMS is sampled low a certain number of clock cycles after reset,
EPROM/flash boot is selected and, after RESET goes high, BMS becomes an
output, acting as EPROM chip select.
If BMS is sampled high after reset, the TigerSHARC processor is at an IDLE
state, waiting for a host or link boot.
The 100K Ohm internal pull-down on BMS may not suffice, depending on
the line loading. Thus, an additional external pull-down resistor may be
necessary for the EPROM boot mode. If host or link boot is desired, BMS
must be high and may be tied directly to the system power bus.
VisualDSP++ 4.5 Loader and Utilities Manual 6-3