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參數(shù)資料
| 型號： | ST20-SWC-SUN |
| 英文描述： | Stratix II GX FPGA 30K FPGA-780 |
| 中文描述： | 的ST20軟件開發(fā)和調(diào)試工具 |
| 文件頁數(shù)： | 7/21頁 |
| 文件大?。?/td> | 360K |
| 代理商： | ST20-SWC-SUN |
ST20–SWC
7/21
2.3.2
Access to the instruction set
ANSI C is a good language for writing embedded applications, since it combines the constructs of
a high level programming language with low level access to the hardware through assembler inserts.
To make the access to some of the ST20 instructions even more effective, a number of special library
functions have been defined which the optimizing compiler can render as in-line code. This removes
the overhead of a library call, but it also gives the optimizer more information on what the program
is doing.
Normally, when the optimizer sees a function containing some assembler code, it must make very
conservative assumptions about the effect the code has on its surroundings, e.g. on static variables
and parameters. By using the functions defined to access the instructions, the optimizer knows
exactly what the effects will be and can make the correct assumptions for the side-effects of the code.
The ST20 instructions that can be accessed in this way include block moves, channel input and
output, bit manipulation, CRC computations, semaphores and some scheduling operations.
2.3.3
Run-time overhead reduction
In order to support the full ANSI C language, a significant run-time library is necessary. The toolset
is supplied with another library, known as the reduced library which does not support file system and
environment requests, which depend on a host.
If some of the other features in ANSI C are not used, then it may be possible to reduce the overhead
further by modifying the run-time initialization, the source of which is provided.
2.3.4
Assembler inserts
Within the SGS-THOMSON implementation of the ANSI C language, assembler code can be written
at any point to achieve direct access to ST20 instructions for reasons of speed and code size. Full
access is available to the ST20 instruction set and C program variables.
2.3.5
Assembler
If there is no other way to obtain the code required, for example when writing customized bootstrap
mechanisms, then the toolset contains an assembler as the final phase of the compiler. This can be
invoked to assemble user-written code.
2.3.6
Dynamic loading of processes
The toolset can encapsulate the code and data of a process in a file called a relocatable separately-
compiled unitor
rsc
. This form is suitable for it to be loaded by another application and called. A set
of functions is provided for this to be achieved. The
rsc
can be found either in a file, or already in
memory, or is input along a channel. The memory variant allows an
rsc
to be placed into ROM and
executed if required. For example, if an application wishes to select a device driver to be placed in
on-chip memory, then a number of possible drivers can be placed in ROM and the application can
choose one for the occasion, copy it into low memory and execute it.
2.3.7
Bootstraps
The source code of the standard bootstraps are provided. The user can then write bootstraps that
are tailored to a specific application by using the standard ones as templates.
2.3.8
Memory configuration
An interactive memory configurer tool is supplied for describing a ST20450 memory configuration.
The memory interface of the ST20450 is configurable and must be initialized before the memory can
be accessed. This data is used by the Toolset tools to generate the code to initialize the memory
相關(guān)PDF資料 |
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| ST203C10CFJ0 | Stratix II GX FPGA 130K FPGA-1508 |
| ST203C12CFJ0 | Stratix II GX FPGA 130K FPGA-1508 |
| ST203S10PFJ0 | Stratix II GX FPGA 130K FPGA-40 |
| ST203S12PFJ0 | Stratix II GX FPGA 90K FPGA-35 |
| ST2044 | Stratix II FPGA 130K FBGA-1020 |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| ST20TOOLSET | 制造商:未知廠家 制造商全稱:未知廠家 功能描述:ST20 software development and debugging tools |
| ST20-TOOLSET/PC | 制造商:STMicroelectronics 功能描述:ST20 DEVELOPMENT TOOLS - Bulk |
| ST20TP1X40S | 制造商:未知廠家 制造商全稱:未知廠家 功能描述:Interface IC |
| ST20TP2X40S | 制造商:未知廠家 制造商全稱:未知廠家 功能描述:Communications Interface |
| ST20TP2X50S | 制造商:未知廠家 制造商全稱:未知廠家 功能描述:Communications Interface |
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