參數(shù)資料
型號(hào)： S80960SA-16
廠商： INTEL CORP
元件分類： 微控制器/微處理器
英文描述： 32-BIT, 16 MHz, RISC PROCESSOR, PQFP80
封裝： EIAJ, QFP-80
文件頁(yè)數(shù)： 39/39頁(yè)
文件大?。?/td> 2371K
代理商： S80960SA-16
5
80960SA
purpose registers provided in other popular micro-
processors. The term global refers to the fact that
these
registers
retain
their
contents
across
procedure calls.
The local registers, on the other hand, are procedure
specific. For each procedure call, the 80960SA
allocates 16 local registers (r0 through r15). Each
local register is 32 bits wide.
1.1.4
Multiple Register Sets
To further increase the efficiency of the register set,
multiple sets of local registers are stored on-chip
(See Figure 4). This cache holds up to four local
register frames, which means that up to three
procedure calls can be made without having to
access the procedure stack resident in memory.
Although programs may have procedure calls nested
many calls deep, a program typically oscillates back
and forth between only two to three levels. As a
result, with four stack frames in the cache, the proba-
bility of having a free frame available on the cache
when a call is made is very high. In fact, runs of
representative C-language programs show that 80%
of the calls are handled without needing to access
memory.
If four or more procedures are active and a new
procedure is called, the 80960SA moves the oldest
local register set in the stack-frame cache to a
procedure stack in memory to make room for a new
set of registers. Global register g15 is the frame
pointer (FP) to the procedure stack.
Global registers are not exchanged on a procedure
call, but retain their contents, making them available
to all procedures for fast parameter passing.
Figure 4. Multiple Register Sets Are Stored On-Chip
r15
r0
31
0
ONE OF FOUR
LOCAL
REGISTER SETS
REGISTER
CACHE
LOCAL REGISTER SET
相關(guān)PDF資料
PDF描述
S80960SB-10 32-BIT, 10 MHz, RISC PROCESSOR, PQFP80
S80C186XL12 16-BIT, 12 MHz, MICROPROCESSOR, PQFP80
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相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
S80960SB-16 制造商:INTEL 制造商全稱:Intel Corporation 功能描述:EMBEDDED 32-BIT MICROPROCESSOR WITH 16-BIT BURST DATA BUS
S80BH97(E)4-C WAF 制造商:Intel 功能描述:
S80C154-12 制造商:未知廠家 制造商全稱:未知廠家 功能描述:8-Bit Microcontroller
S80C154-16 制造商:未知廠家 制造商全稱:未知廠家 功能描述:8-Bit Microcontroller
S80C154-20 制造商:未知廠家 制造商全稱:未知廠家 功能描述:8-Bit Microcontroller
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