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參數資料
型號: W90221F
廠商: WINBOND ELECTRONICS CORP
英文描述: PA-RISC Embedded Micro-Controller(惠普PA-RISC結構的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結構的32位嵌入式微控制器)
文件頁數: 167/174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.
167
Versi on 0. 4, March/2000
{HI, LO}
({HI, LO} + lshift(sign_ext(GR[r1]{0:31}) *
sign_ext(GR[r2]{0:31}),
1){0:63};
break;
}
}
Exception :
None
Multiply And Accumulate Unsign
Format:
MACU, cmplt r1,r2,t
0:5 6:10 11:1 16:18 19 20
21:25 26 27:31
05
r2
r1
~
r
1
12
6 5 5 3 1
1 5 1 5
Purpose:
To multiply two unsign 32-bit word of GR[r1] and GR[r2], then add accumulate
register {HI, LO} with the multiplied result.
Description:
The corresponding 32-bit word of GR[r1] and GR[r2] are interpretted as unsigned
32-bit operands, and are arithmetically multiplied and add the product with the present contents
of the {HI, LO} register, the 64-bit result is placed in {HI, LO} register. The bit in AIR[25] indicates
operating in integer or fraction mode.
The completer
"
r
"
indicates operating in rounding mode, the multiply result can be truncated
the lower 32 bits when the least 32th bit is zero. IF the the least 32th bit is one, add one the high-
order 32 bits and truncate the low-order 32 bits.
Operation:
Integer mode operation (AIR[25] = 0) :
switch (cmplt) {
case r : (r=1, rounding mode){
GR[t]{0:31}
({HI, LO} + (zero_ext(GR[r1]{0:31}) * zero_ext(GR[r2]{0:31})
+ 32h80000000)){0:31};
{HI, LO}
({HI, LO} + (zero_ext(GR[r1]{0:31}) *
zero_ext(GR[r2]{0:31})
+32h80000000)){0:63};
break;
}
default : (r=0, unrounding mode){
GR[t]{0:31}
zero_ext(GR[r2]{0:31}){32:63};
{HI,
LO}
zero_ext(GR[r2]{0:31});
break;
MACU
~
t
{HI,
LO}
+
zero_ext(GR[r1]{0:31})
*
{HI,
LO}
+
zero_ext(GR[r1]{0:31})
*
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