I have seen the Write cylce time of EEPROM is in 'ms' ie., around 10ms. Why this time is so high while the RAM write cycle time is with in a clock cycle. -Muthu
Why write cycle time of EEPROM is high?
Started by ●July 13, 2006
Reply by ●July 13, 20062006-07-13
<muthusnv@gmail.com> wrote in message news:1152773246.939843.194420@s13g2000cwa.googlegroups.com...> I have seen the Write cylce time of EEPROM is in 'ms' ie., around 10ms. > Why this time is so high while the RAM write cycle time is with in a > clock cycle.That is because a write action in an EEPROM involves charging/discharging of a capacitor (a floating gate), which takes a relatively long time time compared to toggling a flipflop in a RAM cell. Meindert
Reply by ●July 13, 20062006-07-13
On 12 Jul 2006 23:47:26 -0700, the renowned muthusnv@gmail.com wrote:>I have seen the Write cylce time of EEPROM is in 'ms' ie., around 10ms. >Why this time is so high while the RAM write cycle time is with in a >clock cycle. > > >-MuthuWriting to a typical nonvolatile memory cell is a completely different process from flipping a bit in an SRAM. See Fowler-Nordheim tunneling and channel hot electron injection. Ferroelectric NVRAM technology (and others such as the new MRAM technology) can give fast write/erase times but they are not in as wide usage at present. Best regards, Spehro Pefhany -- "it's the network..." "The Journey is the reward" speff@interlog.com Info for manufacturers: http://www.trexon.com Embedded software/hardware/analog Info for designers: http://www.speff.com
Reply by ●July 14, 20062006-07-14
muthusnv@gmail.com wrote:> I have seen the Write cylce time of EEPROM is in 'ms' ie., around 10ms. > Why this time is so high while the RAM write cycle time is with in a > clock cycle.Why does walking a mile take 15 minutes, when a car can easily do it in 30 seconds? -- Hans-Bernhard Broeker (broeker@physik.rwth-aachen.de) Even if all the snow were burnt, ashes would remain.
Reply by ●July 14, 20062006-07-14
"Hans-Bernhard Broeker" <broeker@physik.rwth-aachen.de> wrote in message news:4hq0o3Fpce0U3@news.dfncis.de...> muthusnv@gmail.com wrote: > > I have seen the Write cylce time of EEPROM is in 'ms' ie., around 10ms. > > Why this time is so high while the RAM write cycle time is with in a > > clock cycle. > > Why does walking a mile take 15 minutes, when a car can easily do it > in 30 seconds?No that easily. 1 mile in 30 sec is 120 mph, average. Peter
Reply by ●July 14, 20062006-07-14
On 2006-07-14, Hans-Bernhard Broeker <broeker@physik.rwth-aachen.de> wrote:> muthusnv@gmail.com wrote: >> I have seen the Write cylce time of EEPROM is in 'ms' ie., around 10ms. >> Why this time is so high while the RAM write cycle time is with in a >> clock cycle. > > Why does walking a mile take 15 minutes, when a car can easily do it > in 30 seconds?Damn. That's a pretty fast car. -- Grant Edwards grante Yow! .. I think I'd at better go back to my DESK visi.com and toy with a few common MISAPPREHENSIONS...
Reply by ●July 14, 20062006-07-14
Peter Dickerson wrote:> "Hans-Bernhard Broeker" <broeker@physik.rwth-aachen.de> wrote in message > news:4hq0o3Fpce0U3@news.dfncis.de... >> muthusnv@gmail.com wrote: >>> I have seen the Write cylce time of EEPROM is in 'ms' ie., around 10ms. >>> Why this time is so high while the RAM write cycle time is with in a >>> clock cycle. >> Why does walking a mile take 15 minutes, when a car can easily do it >> in 30 seconds? > > No that easily. 1 mile in 30 sec is 120 mph, average. >What's the speed limit on autobahns, these days?
Reply by ●July 15, 20062006-07-15
Grant Edwards <grante@visi.com> wrote:> On 2006-07-14, Hans-Bernhard Broeker <broeker@physik.rwth-aachen.de> wrote:> > Why does walking a mile take 15 minutes, when a car can easily do it > > in 30 seconds?> Damn. That's a pretty fast car.Not by German standards ;-> Hmm, let's see: 120 mph, that's 193 km/h. Granted, my own car can't do that. But you'll have to believe me when I tell you that driving 100 mph on the Autobahn, which it can do, I still get overtaken by *much* faster cars, about once every 5 minutes. -- Hans-Bernhard Broeker (broeker@physik.rwth-aachen.de) Even if all the snow were burnt, ashes would remain.
Reply by ●July 16, 20062006-07-16
"Hans-Bernhard Broeker" <broeker@physik.rwth-aachen.de> wrote in message news:4ht4jfF16gqlU1@news.dfncis.de...> Grant Edwards <grante@visi.com> wrote: > > On 2006-07-14, Hans-Bernhard Broeker <broeker@physik.rwth-aachen.de>wrote:> > > > Why does walking a mile take 15 minutes, when a car can easily do it > > > in 30 seconds? > > > Damn. That's a pretty fast car. > > Not by German standards ;-> > > Hmm, let's see: 120 mph, that's 193 km/h. Granted, my own car can't > do that. But you'll have to believe me when I tell you that driving > 100 mph on the Autobahn, which it can do, I still get overtaken by > *much* faster cars, about once every 5 minutes.But thats not comparable to walking a mile, where you start from stopped and finish stopped. The car has to *average* 120 mph, which means peaking at 240 mph to minimize acceleration - you only need 0 to 240 mph in 15 seconds and some damn good brakes! Peter
Reply by ●July 16, 20062006-07-16
On 2006-07-16, Peter Dickerson <first{dot}surname@tesco.net> wrote:>>>> Why does walking a mile take 15 minutes, when a car can easily >>>> do it in 30 seconds? >> >> > Damn. That's a pretty fast car. >> >> Not by German standards ;-> >> >> Hmm, let's see: 120 mph, that's 193 km/h. Granted, my own car >> can't do that. But you'll have to believe me when I tell you >> that driving 100 mph on the Autobahn, which it can do, I still >> get overtaken by *much* faster cars, about once every 5 >> minutes.That's like saying that having a billion dollars isn't "pretty rich" because there are people who have more than a billion dollars. I didn't say there weren't cars that couldn't do 120mph easily. I said that a car that can do that is pretty fast (e.g. in a small minority -- the average car can even come close to doing it). If you don't think a car that can do 120mph easily is pretty fast, then how fast _does_ a car have to go to be considered pretty fast? I've drivin 100mph on the Autobahn, but the car I was driving (an Audi A4, IIRC) couldn't even do 100 "easily", and it certainly couldn't do 120. The vast majority of other cars I saw on the Autobahn couldn't do 120 at all, let alone easily. I still think that (even in Germany) a car can do 120mph "easily" is pretty fast. Motorcycles, OTOH... -- Grant Edwards grante Yow! ... or were you at driving the PONTIAC that visi.com HONKED at me in MIAMI last Tuesday?