給定n個(gè)整數(shù)a , a , ,an 1 2 組成的序列。序列中元素i a 的符號(hào)定義為：
ï î
ï í
ì
- <
=
>
=
1 0
0 0
1 0
sgn( )
i
i
i
i
a
a
a
a
符號(hào)平衡問(wèn)題要求給定序列的最長(zhǎng)符號(hào)平衡段的長(zhǎng)度L，即：
þ ý ü
î í ì
= + - = å
=
£ £ £
max 1| sgn( ) 0
1
j
k i
i j n k
L j i a 。
例如，當(dāng)n=10，相應(yīng)序列為：1，1，-1，-2，0，1，3，-1，2，-1 時(shí)，L=9。
Testability is the concern most often voiced by Texas Instruments (TIä )
application specific integrated circuit (ASIC) users. This document is intended
to consolidate TI policies into a coherent approach to designing for testability.
It is not intended as a specification, but as a guide you can use for developing
test strategies when designs are being initiated
