freshair_cn - 博客园

Data Dependency

摘要： https://en.wikipedia.org/wiki/Data_dependency (There’s some misleading expression on the flow/data dependency statement.) 1, what is data dependency A 阅读全文

posted @ 2018-03-30 14:53 freshair_cn 阅读(390) 评论(0) 推荐(0) 编辑

antidependence and data hazard

摘要： See below example. ADDD F6, F0, F8 SUBD F8, F10, F14 Some article would say that “ There’s an antidependence between ADDD and SUBD…”. This statement c 阅读全文

posted @ 2018-03-29 10:54 freshair_cn 阅读(125) 评论(0) 推荐(0) 编辑

Tomasulo algorithm

摘要： https://en.wikipedia.org/wiki/Tomasulo_algorithm#Applications_and_legacy 1, what is Tomasulo algorithm It is an algorithm for dynamically scheduling o 阅读全文

posted @ 2018-03-29 10:13 freshair_cn 阅读(313) 评论(0) 推荐(0) 编辑

scoreboarding

摘要： Reference docs: https://en.wikipedia.org/wiki/Scoreboarding SSC_course_5_Scoreboard_ex.pdf 1, what is scoreboarding A method to dynamically schedule p 阅读全文

posted @ 2018-03-27 14:57 freshair_cn 阅读(513) 评论(0) 推荐(0) 编辑

data hazard in CPU pipeline

摘要： 1, background info 5 stages in CPU pipeline: IF, ID, EX, MM, WB IF – Instruction Fetch ID – Instruction Decode EX – Execute MM – Memory WB – Write Bac 阅读全文

posted @ 2018-03-23 17:37 freshair_cn 阅读(473) 评论(0) 推荐(0) 编辑

差分绕线间距对阻抗的影响

摘要：差分阻抗并不会随着绕线间距的增加而单向递增。下图条件是：线宽为6 mil，间距为9 mil，目标差分阻抗为100 ohm. 当间距增加到42 mil时，阻抗几乎不再变化，阻抗变化值约为18%：间距变化引起的阻抗突变和反射噪声如图：对眼图的影响：阅读全文

posted @ 2018-03-22 13:10 freshair_cn 阅读(3472) 评论(0) 推荐(0) 编辑

differential related impedance and termination

摘要： Impedance (1) Z0 Z0 is the impedance of one T-line while other lines are held at 0. Single end. (2) Zdiff Zdiff is the impedance bw T1 and T2. when li 阅读全文

posted @ 2018-03-21 17:15 freshair_cn 阅读(578) 评论(0) 推荐(0) 编辑

about how to determine a prime number

摘要： (1) if divided by 2 or 3, then no; (2) we only have to go through prime factors; because a composite can always be divided into primes. (3) since 2 is 阅读全文

posted @ 2018-03-20 16:25 freshair_cn 阅读(211) 评论(0) 推荐(0) 编辑

关于电容与Q值

摘要： 1, 电容模型电容阻抗可以表示为：可算得自谐振频率点为：在该点，容抗与感抗差为0，电容表现出纯电阻性。 2, 阻抗曲线自谐点是区分电容器呈容性还是感性的分界点。从阻抗曲线看，在自谐点附近阻抗较小，因此去耦电容都有一定的工作范围，只有在自谐点附近电容才有较好的去耦作用。 3, Q值因为电容可阅读全文

posted @ 2018-03-14 15:10 freshair_cn 阅读(10060) 评论(0) 推荐(0) 编辑

关于join的一些补充

摘要： 1, 为什么join是string的method而不是list的method http://effbot.org/pyfaq/why-is-join-a-string-method-instead-of-a-list-or-tuple-method.htm 2, join的语法阅读全文

posted @ 2017-12-19 16:20 freshair_cn 阅读(192) 评论(0) 推荐(0) 编辑