Path: utzoo!attcan!uunet!seismo!sundc!pitstop!texsun!texsun.central.sun.com!convex!authorplaceholder From: gelsey@convex.UUCP Newsgroups: comp.arch Subject: Re: More On Write-Only Control Register Message-ID: <63900018@convex> Date: 21 Jun 88 22:53:00 GMT References: <439@cf-cm.UUCP> Lines: 17 Nf-ID: #R:cf-cm.UUCP:-43900:convex:63900018:000:620 Nf-From: convex.UUCP!gelsey Jun 21 17:53:00 1988 Write-only registers have a number of advantages: 1) Extremely fast Even a CMOS write-only register will operate in under a nanosecond. 2) Very low power power dissipation Typically they draw in the sub-microamp region 3) Very space efficient One can fit at least an order of magnitude of wo-registers in the same space as a rw-register. 4) Readily available Any semiconductor salesman worth his salt will be happy to sell you a truckload full on a moment's notice. Second sources are no problem. These days most commercial computer designers attempt to use write-only registers wherever possible.