參數(shù)資料
型號(hào): Alpha 21164
廠商: SAMSUNG SEMICONDUCTOR CO. LTD.
英文描述: Alpha Microprocessor(64位微處理器)
中文描述: 阿爾法微處理器(64位微處理器)
文件頁(yè)數(shù): 50/115頁(yè)
文件大?。?/td> 846K
代理商: ALPHA 21164
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50
Alpha Architecture Basics
Addressing
6.2 Addressing
The basic addressable unit in the Alpha architecture is the 8-bit byte. The 21164 sup-
ports a 43-bit virtual address.
Virtual addresses as seen by the program are translated into physical memory
addresses by the memory-management mechanism. The 21164 supports a 40-bit
physical address.
6.3 Integer Data Types
Alpha architecture supports four integer data types:
Note:
Alpha implementations may impose a significant performance penalty
when accessing operands that are not NATURALLY ALIGNED. Refer
to the
Alpha Architecture Reference Manual
for details.
Data Type
Description
Byte
A byte is 8 contiguous bits that start at an addressable byte boundary. A
byte is an 8-bit value. A byte is supported in Alpha architecture by the
EXTRACT, INSERT, LDBU, MASK, SEXTB, STB, and ZAP instruc-
tions.
Word
A word is 2 contiguous bytes that start at an arbitrary byte boundary. A
word is a 16-bit value. A word is supported in Alpha architecture by the
EXTRACT, INSERT, LDWU, MASK, SEXTW, and STW instructions.
Longword
A longword is 4 contiguous bytes that start at an arbitrary byte boundary. A
longword is a 32-bit value. A longword is supported in Alpha architecture
by sign-extended load and store instructions and by longword arithmetic
instructions.
Quadword
A quadword is 8 contiguous bytes that start at an arbitrary byte boundary.
A quadword is supported in Alpha architecture by load and store instruc-
tions and quadword integer operate instructions.
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