signoff 指的是在設(shè)計(jì)流程的不同階段對(duì)芯片進(jìn)行確認(rèn)和批準(zhǔn)。通常，signoff 涉及到多個(gè)階段和多個(gè)方面的確認(rèn)，以確保設(shè)計(jì)在滿(mǎn)足規(guī)格要求的情況下能夠正常工作，并且符合預(yù)期的性能指標(biāo)。1-signoff原意Sign off - 正式完成并宣布項(xiàng)目結(jié)束舉例: After we sign off the project, we can take the whole team out to celebrate.it means to sign your name on a document. Usually 'sign off' is used when something of yours is being given/taken from you."sign off the deeds to your house."= you will not own your house anymore.In the automated design of integrated circuits, signoff (also written as sign-off) checks is the collective name given to a series of verification steps that the design must pass before it can be taped out. This implies an iterative process involving incremental fixes across the board using one or more check types, and then retesting the design. There are two types of sign-off's: front-end sign-off and back-end sign-off. After back-end sign-off, the chip goes to fabrication. After listing out all the features in the specification, the verification engineer will write coverage for those features to identify bugs, and send back the RTL design to the designer. Bugs, or defects, can include issues like missing features (comparing the layout to the specification), errors in design (typo and functional errors), etc. When the coverage reaches a maximum percentage then the verification team will sign it off. By using a methodology like UVM, OVM, or VMM, the verification team develops a reusable environment. Nowadays, UVM is more popular than others.? ??? ? ??
做電池供電攝像頭、可視門(mén)鈴、戶(hù)外安防的同學(xué)應(yīng)該都踩過(guò)這個(gè)坑：攝像頭要拍，ISP、sensor、無(wú)線(xiàn)模塊全得開(kāi)著，整機(jī)電流動(dòng)輒幾百 mA。一節(jié) 18650 撐不了幾天，用戶(hù)投訴“怎么又沒(méi)電了”。有人會(huì)說(shuō)：加個(gè) PIR 人體紅外不就行了？問(wèn)題是 PIR 怕熱、怕寵物、怕隔著亞克力/玻璃殼，而且只能感知“有溫差的人體移動(dòng)”，靈敏度飄忽。真正省電的思路應(yīng)該是：讓攝像頭平時(shí)徹底睡死，只有“前面有人/有動(dòng)靜”時(shí)才被一鍵喚醒——而負(fù)責(zé)這個(gè)“看門(mén)”角色的，最合適的是一顆低功耗雷達(dá)。一、為什么是雷達(dá)，而不是 PI
