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參數(shù)資料
| 型號： | Intel387 sx |
| 廠商： | Intel Corp. |
| 英文描述： | SX Math Coprocessor(32位數(shù)學協(xié)處理器) |
| 中文描述： | 山西數(shù)學協(xié)處理器（32位數(shù)學協(xié)處理器） |
| 文件頁數(shù)： | 8/47頁 |
| 文件大?。?/td> | 443K |
| 代理商： | INTEL387 SX |
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Intel387
TM
SX MATH COPROCESSOR
of the static architecture. It is responsible for shut-
ting down idle sections of the device to save power.
Microprocessor/Math CoProcessor Interface
The Intel386 CPU interprets the pattern 11011B in
most significant five bits of an instruction as an op-
code intended for a math coprocessor. Instructions
thus marked are called ESCAPE or ESC instruc-
tions. Upon decoding the instruction as an ESC in-
struction, the Intel386 CPU transfers the opcode to
the math coprocessor through an I/O write cycle at
a dedicated address (8000F8H) outside the normal
programmed I/O address range. The math coproc-
essor has dedicated output signals for controlling
the data transfer and notifying the CPU if the Math
CoProcessor is busy or that a floating point error has
occurred.
2.3 Power Management
The Intel387 SX Math CoProcessor offers two
modes of power management; dynamic and idle.
2.3.1 DYNAMIC MODE
Dynamic Mode
is when the device is executing an
instruction. Using Intel’s CHMOS IV technology, the
Intel387 SX Math CoProcessor draws considerably
less power than its predecessor. The active power
supply current is reduced to approximately 100 mA
at 20 MHz and provides low case temperatures.
2.3.2 IDLE MODE
When an instruction is not being executed, the
Intel387 SX Math CoProcessor will automatically
change to
Idle Mode
. Three clocks after completion
of the previous instruction, the internal power man-
ager shuts down the floating point execution unit
and all non-essential circuitry. Only portions of the
Bus Interface Unit remain active to monitor the CPU
bus activity and to accept the next instruction when
it is transferred. When the CPU transfers the next
instruction to the Math CoProcessor, the Intel387 SX
Math CoProcessor accepts the instruction and
ramps the internal core within one clock so there is
no impact to performance or throughput. In idle
mode, the Intel387 SX Math CoProcessor draws typ-
ically 4 mA of current and reduces case temperature
to near ambient.
NOTE:
In asynchronous clock mode (CKM
e
0), the inter-
nal idle mode is disabled.
2.4 Compatibility
The Intel387 SX Math CoProcessor is compatible
with the Intel387 SL Mobile Math CoProcessor. Due
to the increased performance and internal pipelining
effects, diagnostic programs should never use in-
struction execution time for test purposes.
2.5 Performance
The increased performance of floating point calcula-
tions can be attributed to the 84-bit architecture and
floating point processor. For the CPU to execute
floating point calculations requires very long soft-
ware emulation methods with reduced resolution
and accuracy. The performance of the Intel387 SX
Math CoProcessor has been further enhanced
through improvements in the internal microcode and
through internal architectural changes. These refine-
ments will increase Whetstone benchmarks by ap-
proximately 10% to 25% over the original Intel387
SX Math CoProcessor.
Real performance, however, should be measured
with application software. Depending upon software
coding, system overhead, and percentage of floating
point instructions, performance can vary significant-
ly.
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