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參數資料
| 型號： | S5N8947 |
| 廠商： | SAMSUNG SEMICONDUCTOR CO. LTD. |
| 英文描述： | MCU for ADSL/Cable Modem |
| 中文描述： | 單片機為ADSL / Cable Modem的 |
| 文件頁數： | 17/49頁 |
| 文件大?。?/td> | 407K |
| 代理商： | S5N8947 |
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ELECTRONICS
S5N8947 (ADSL/Cable Modem MCU)
SAMSUNG ELECTRONICS
Page : 17
MagIC Team
5.2. Instruction Set
The S5N8947 instruction set is divided into two subsets: a standard 32-bit ARM instruction set and
a
16-bit THUMB instruction set
.
The 32-bit ARM instruction set is comprised of thirteen basic instruction types which can be divided
into four broad classes:
l
Four types of branch instructions which control program execution flow, instruction privilege levels,
and switching between ARM code and THUMB code.
l
Three types of data processing instructions which use the on-chip ALU, barrel shifter, and multiplier
to perform high-speed data operations in a bank of 31 registers (all with 32-bit register widths).
l
Three types of load and store instructions which control data transfer between memory locations and
the registers. One type is optimized for flexible addressing, another for rapid context switching, and
the third for swapping data.
l
Three types of co-processor instructions which are dedicated to controlling external co-processors.
These instructions extend the off-chip functionality of the instruction set in an open and uniform way.
NOTE :
All 32-bit ARM instructions can be executed conditionally.
The 16-bit THUMB instruction set contains 36 instruction formats drawn from the standard 32-bit
ARM instruction set. The THUMB instructions can be divided into four functional groups:
l
Four branch instructions.
l
Twelve data processing instructions, which are a subset of the standard ARM data processing
instructions.
l
Eight load and store register instructions.
l
Four load and store multiple instructions.
NOTE :
Each 16-bit THUMB instruction has a corresponding 32-bit ARM instruction with the identical
processing model.
The 32-bit ARM instruction set and the 16-bit THUMB instruction sets are good targets for
compilers of many different high-level languages. When assembly code is required for critical code
segments, the ARM programming technique is straightforward, unlike that of some RISC processors
which depend on sophisticated compiler technology to manage complicated instruction interdependencies.
Pipelining is employed so that all parts of the processor and memory systems can operate
continuously. Typically, while one instruction is being executed, its successor is being decoded, and a third
instruction is being fetched from memory.
5.3. OPERATING STATES
From a programmer's point of view, the ARM7TDMI core is always in one of two operating states.
These states, which can be switched by software or by exception processing, are:
l
ARM state
(when executing 32-bit, word-aligned, ARM instructions), and
l
THUMB state
(when executing 16-bit, half-word aligned THUMB instructions).
相關PDF資料 |
PDF描述 |
|---|---|
| S5N8947X | MCU for ADSL/Cable Modem |
| S5N8950 | G.dmt ADSL Transceiver for CO and CPE |
| S5N8951 | G.dmt ADSL Analog Front End IC |
| S5N8951X | G.dmt ADSL Analog Front End IC |
| S5N8952 | ADSL Transceiver for NIC |
相關代理商/技術參數 |
參數描述 |
|---|---|
| S5N8947X | 制造商:SAMSUNG 制造商全稱:Samsung semiconductor 功能描述:MCU for ADSL/Cable Modem |
| S5N8950 | 制造商:SAMSUNG 制造商全稱:Samsung semiconductor 功能描述:G.dmt ADSL Transceiver for CO and CPE |
| S5N8951 | 制造商:SAMSUNG 制造商全稱:Samsung semiconductor 功能描述:G.dmt ADSL Analog Front End IC |
| S5N8951X | 制造商:SAMSUNG 制造商全稱:Samsung semiconductor 功能描述:G.dmt ADSL Analog Front End IC |
| S5N8952 | 制造商:SAMSUNG 制造商全稱:Samsung semiconductor 功能描述:ADSL Transceiver for NIC |
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