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參數(shù)資料
| 型號(hào)： | intel386 SX |
| 廠商： | Intel Corp. |
| 英文描述： | 32-Bit CPU With a 16-Bit External Data Bus And a 24-bit External Address Bus(帶16位內(nèi)部數(shù)據(jù)總線和24位內(nèi)部地址總線32位微處理器) |
| 中文描述： | 32位16位外部數(shù)據(jù)總線和24位外部地址總線CPU（帶16位內(nèi)部數(shù)據(jù)總線和24位內(nèi)部地址總線32位微處理器） |
| 文件頁數(shù)： | 15/102頁 |
| 文件大?。?/td> | 1166K |
| 代理商： | INTEL386 SX |
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Intel386
TM
SX MICROPROCESSOR
Table 2.4. BASE and INDEX Registers for 16- and 32-Bit Addresses
16-Bit Addressing
32-Bit Addressing
BASE REGISTER
INDEX REGISTER
BX,BP
SI,DI
Any 32-bit GP Register
Any 32-bit GP Register
Except ESP
1, 2, 4, 8
0, 8, 32-bits
SCALE FACTOR
DISPLACEMENT
None
0, 8, 16-bits
2.5 Data Types
The Intel386 SX Microprocessor supports all of the
data types commonly used in high level languages:
Bit:
A single bit quantity.
Bit Field:
A group of up to 32 contiguous bits, which
spans a maximum of four bytes.
Bit String:
A set of contiguous bits; on the Intel386
SX Microprocessor, bit strings can be up to 4 giga-
bits long.
Byte:
A signed 8-bit quantity.
Unsigned Byte:
An unsigned 8-bit quantity.
Integer (Word):
A signed 16-bit quantity.
Long Integer (Double Word):
A signed 32-bit quan-
tity. All operations assume a 2’s complement repre-
sentation.
Unsigned Integer (Word):
An unsigned 16-bit
quantity.
Unsigned Long Integer (Double Word):
An un-
signed 32-bit quantity.
Signed Quad Word:
A signed 64-bit quantity.
Unsigned Quad Word:
An unsigned 64-bit quantity.
Pointer:
A 16 or 32-bit offset-only quantity which in-
directly references another memory location.
Long Pointer:
A full pointer which consists of a 16-
bit segment selector and either a 16 or 32-bit offset.
Char:
A byte representation of an ASCII Alphanu-
meric or control character.
String:
A contiguous sequence of bytes, words or
dwords. A string may contain between 1 byte and 4
gigabytes.
BCD:
A byte (unpacked) representation of decimal
digits 0–9.
Packed BCD:
A byte (packed) representation of two
decimal digits 0–9 storing one digit in each nibble.
When the Intel386 SX Microprocessor is coupled
with its numerics coprocessor, the Intel387 SX, then
the following common floating point types are sup-
ported:
Floating Point:
A signed 32, 64, or 80-bit real num-
ber representation. Floating point numbers are sup-
ported by the Intel387 SX numerics coprocessor.
Figure 2.5 illustrates the data types supported by the
Intel386 SX Microprocessor and the Intel387 SX.
2.6 I/O Space
The Intel386 SX Microprocessor has two distinct
physical address spaces: physical memory and I/O.
Generally, peripherals are placed in I/O space al-
though the Intel386 SX Microprocessor also sup-
ports memory-mapped peripherals. The I/O space
consists of 64K bytes which can be divided into 64K
8-bit ports or 32K 16-bit ports, or any combination of
ports which add up to no more than 64K bytes. The
64K I/O address space refers to physical addresses
rather than linear addresses since I/O instructions
do not go through the segmentation or paging hard-
ware. The M/IO
Y
pin acts as an additional address
line, thus allowing the system designer to easily de-
termine which address space the processor is ac-
cessing.
The I/O ports are accessed by the IN and OUT in-
structions, with the port address supplied as an im-
mediate 8-bit constant in the instruction or in the DX
register. All 8-bit and 16-bit port addresses are zero
extended on the upper address lines. The I/O in-
structions cause the M/IO
Y
pin to be driven LOW.
I/O port addresses 00F8H through 00FFH are re-
served for use by Intel.
15
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| INTEL486 GX | Emedded Ultra-Low Power INTEL486 GX Processor(嵌入式超低能量處理器) |
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相關(guān)代理商/技術(shù)參數(shù) |
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