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參數資料
型號: W90210F
廠商: WINBOND ELECTRONICS CORP
元件分類: 微控制器/微處理器
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: 32-BIT, MROM, RISC MICROCONTROLLER, PQFP208
封裝: PLASTIC, QFP-208
文件頁數: 50/67頁
文件大小: 297K
代理商: W90210F
W90210F
50
Version 1.4, 10/8/97
The above information is the exclusive intellectual property of Winbond Electronics Corp. and shall not be disclosed, distributed or reproduced without permssion fromWinbond.
Halfword parallel average
Format:
HAVE
HAVE
r1,r2,t
0
1
0b
6
02
6
5
5
3
5
r2
r1
t
0:5
5:10
11:15
27:31
26
0
1
0
Purpose:
To average multiple pairs of halfwords in parallel.
Description:
The corresponding halfwords of GR r1 and GR r2 are averaged in parallel. Both operands
are unsigned. The average is obtained by adding the corresponding halfwords, and shifting
the result right by one bit, to perform a divide by 2, with the halfword carry bit from the
addition shifted back into the leftmost position of each result. The halfword results are
placed in GR t.
Unbiased rounding is performed on the result of summation, to reduce the accumulation of
rounding errors with cascaded operations.
Operation:
cat(carry_L, sum{0..15})
GR[r1]{0..15} + GR[r2]{0..15}
cat(carry_R, sum{16..31})
GR[r1]{16..31} + GR[r2]{16..31}
new_lsb_L
sum{14} | sum{15};
new_lsb_R
sum{30} | sum{31};
GR[t]{0..15}
cat(carry_L,sum{0..13}, new_lsb_L);
GR[t]{16..31}
cat(carry_L,sum{16..29}, new_lsb_R);
Exceptions:
None.
/* unbiased rounding */
/* unbiased rounding */
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