欢迎访问ic37.com |
会员登录 免费注册
发布采购

30141-23 参数 Datasheet PDF下载

30141-23图片预览
型号: 30141-23
PDF下载: 下载PDF文件 查看货源
内容描述: 的Geode ™ GXM处理器与MMX支持集成的x86解决方案 [Geode⑩ GXm Processor Integrated x86 Solution with MMX Support]
分类和应用: 微控制器和处理器外围集成电路微处理器
文件页数/大小: 244 页 / 4221 K
品牌: NSC [ National Semiconductor ]
 浏览型号30141-23的Datasheet PDF文件第198页浏览型号30141-23的Datasheet PDF文件第199页浏览型号30141-23的Datasheet PDF文件第200页浏览型号30141-23的Datasheet PDF文件第201页浏览型号30141-23的Datasheet PDF文件第203页浏览型号30141-23的Datasheet PDF文件第204页浏览型号30141-23的Datasheet PDF文件第205页浏览型号30141-23的Datasheet PDF文件第206页  
Instruction Set (Continued)  
9.1 GENERAL INSTRUCTION SET FORMAT  
Depending on the instruction, the GXm processor core  
instructions follow the general instruction format shown in  
Table 9-1.  
diate data. An instruction can be as short as one byte and  
as long as 15 bytes. If there are more than 15 bytes in the  
instruction, a general protection fault (error code 0) is gen-  
erated.  
These instructions vary in length and can start at any byte  
address. An instruction consists of one or more bytes that  
can include prefix bytes, at least one opcode byte, a mod  
r/m byte, an s-i-b byte, address displacement, and imme-  
The fields in the general instruction format at the byte  
level are summarized in Table 9-2 and detailed in the fol-  
lowing subsections.  
Table 9-1. General Instruction Set Format  
Register and Address Mode Specifier  
mod r/m Byte  
s-i-b Byte  
Address  
Displacement  
Immediate  
Data  
Prefix (optional)  
Opcode  
mod  
7:6  
reg  
r/m  
ss  
index  
base  
0 or More Bytes  
1 or 2 Bytes  
5:3  
2:0  
7:6  
5:3  
2:0  
0, 8, 16, or 32 Bits 0, 8, 16, or 32 Bits  
Table 9-2. Instruction Fields  
Field Name  
Description  
Prefix (optional)  
Prefix Field(s): One or more optional fields that are used to specify segment register override, address  
and operand size, repeat elements in string instruction, LOCK# assertion.  
Opcode  
Opcode Field: Identifies instruction operation.  
mod  
Address Mode Specifier: Used with r/m field to select addressing mode.  
General Register Specifier: Uses reg, sreg3 or sreg2 encoding depending on opcode field.  
Address Mode Specifier: Used with mod field to select addressing mode.  
Scale factor: Determines scaled-index address mode.  
reg  
r/m  
ss  
index  
Index: Determines general register to be used as index register.  
Base: Determines general register to be used as base register.  
Displacement: Determines address displacement.  
base  
Address Displacement  
Immediate Data  
Immediate Data: Immediate-data operand used by instruction.  
www.national.com  
202  
Revision 3.1