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參數(shù)資料
型號: W90221F
廠商: WINBOND ELECTRONICS CORP
英文描述: PA-RISC Embedded Micro-Controller(惠普PA-RISC結(jié)構(gòu)的32位嵌入式微控制器)
中文描述: PA - RISC的嵌入式微控制器(惠普的PA - RISC結(jié)構(gòu)的32位嵌入式微控制器)
文件頁數(shù): 171/174頁
文件大小: 2102K
代理商: W90221F
=
The above information is the exclusive intellectual property of Winbond Electronics and shall not be disclosed, distributed or reproduced without permission from Winbond.
171
Versi on 0. 4, March/2000
GR[t]{0:31}
zero_ext(GR[r2]{0:31}),
1){0:31};
{HI, LO}
({HI, LO} - lshift(zero_ext(GR[r1]{0:31}) *
zero_ext(GR[r2]{0:31}),
1){0:63};
break;
}
}
Exception :
None
Saturation
Format:
SAT, cmplt, t
0:5 6:10 11:15 16:18 19 20
21:25 26 27:31
05
r2
r1
~
c
1
16
6 5 5 3 1
1 5 1 5
Purpose:
To test accumulate register {HI, LO} overflow, then saturate the accumulate
register {HI, LO}
Description:
To test accumulate register {HI, LO} overflow, and if the accumulate register {HI,
LO} is overflow, then saturate the accumulate register, the accumulate register is not overflow,
then perform a null operation.
The saturation instruction is intended to be used at the completion of a series of
multiply/accumulate operations, so that temporary overflows do
NOT
occur the accumulator to
saturate.
The saturation condition and result depend on operation type of halfword or word
multiply/accumulate. If half word operation, test the high-order 33-bits of the accumulate register.
The possible results after execution of saturation instruction is shown in Table I. If word
operation, test the carry bit (hidden 4-bits) and sign bit, the possible results after execution of
saturation instruction is shown in Table II.
The
cmplt
completer c specifies the saturation mode on halfword or word
operation
Table I. (Halfword saturation operation mode).
*HMV HI[0]
0
0
No change
0
1 No change
1
0
64
0000_0000_7FFF_FFFF
1
1 64
({HI,
LO}
-
lshift(zero_ext(GR[r1]{0:31})
*
SAT
~
t
FFFF_FFFF_8000_0000
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