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Engineer-to-Engineer Note EE-351
Technical notes on using Analog Devices DSPs, processors and development tools
For compatibility with the previous
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Using the ADS P-BF592 Blackfin® Processor Tools Utility ROM
Contributed by Andy Kettler Rev 2 – March 16, 2011
Introduction
The AD SP-BF592 Blackfin® processor provides
fast, low latency on-chip memory that includes
64K bytes of L1 instruction ROM, 32K bytes of
L1 instruction SRAM, and 32K bytes of L1 data
SRAM. The processor has no L2 internal
memory, and it does not provide an external
memory interface (L3 memory). Therefore an
application might be constrained by the
ava ilabilit y o f L1 in st ruc t ion S RAM . O ne wa y to
address this would be to take advantage of the
on-chip Tools Utility R OM.
This EE-Note describes the Too ls Utility ROM, it
explains how to use it, and the implications
involved. Also, this document assumes that
applications are built using the VisualDSP++®
5.0 development tools (Update 9 or later
revisions).
release of t he pro duct, t he VisualDSP++
development tools refer to the ADSPBF592 pro cessor as t he ADSP-BF592-A
processor.
Overview
The Tools Utility ROM is available with the
ADSP-BF592 processor (in all silicon revisions
except revision 0.0) and uses its 64K bytes of L1
instruct ion ROM to provide:
Compiler support functions, which are hidden
routines that the compiler knows about and
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re lies on to pro vide run-time services for the
code that it generates (such as emulation of
floating-po in t ar it hmet ic t hat is no t supported
by the hardware ins truction set).
A set of C and DSP run-t ime lib r a ry func tio n s
including, for example, functions from
string.h and math.h, matrix manipulation
functions, and filter and FFT functions.
Appendix A has a detailed description of the
content s of the ROM .
The core of the VisualDSP++ Kernel (VDK)
referred to here as TMK.
Benefits of Using the Tools Utility ROM
The basic memory layout of the ADSP-BF592
proc essor is:
L1 instr uction SR AM 32K bytes
L1 instr uction RO M 64K bytes
L1 data SRAM 32K bytes
L1 scratchpad SRAM 4K bytes
There is no support for external memory, and so
expl oit ing t he T o ols Ut ility R OM may o ver co me
shortages in L1 instruction SRAM (refer to the
following section which describes the ROM’s L1
data SRAM requirements). For example, the
linker know s tha t th e T ools U tility R O M c on ta ins
a copy of the C library function strcmp. S o if an
application calls that function then all the linker
has to do is to r edirect all appropriate references
to where the strcmp function is located in the
ROM. Should an application decide not to link
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