SI
SI
discoversearch

We've detected that you're using an ad content blocking browser plug-in or feature. Ads provide a critical source of revenue to the continued operation of Silicon Investor.  We ask that you disable ad blocking while on Silicon Investor in the best interests of our community.  If you are not using an ad blocker but are still receiving this message, make sure your browser's tracking protection is set to the 'standard' level.
Politics : Formerly About Advanced Micro Devices
 Public ReplyPrvt ReplyMark as Last ReadFilePrevious 10Next 10PreviousNext  
To: Goutam who wrote (72627)9/21/1999 12:07:00 AM
From: Ali Chen  Read Replies (1) of 1573439
 
Goutama, <Thanks for correcting me. My apologies to Tony.>
There is no need to apologize to any mentally
challenged "manager". There is still a confusion
about "frequency of signal switching" and
"data transfer rate". They are not equal.
Extreme example: the telephone modem line
has a bandwidth of 3.5kHz yet DSP engineers
managed to transfer up to 56 kbits per second
of data.

In the conventional PC-100 DRAM design the
data lines do not switch at 100MHz either - they
switch at 50MHz maximum, while the clock
runs at 100MHz. For this reason this design is
called as "100MHz" and is capable to transfer
100 Mbits/s per bit lane.

For the RAMBUS, they employed
a differential clocking scheme where actually
TWO clocks are supplied, so you may think
that each clock samples half of data phases
at conventional single edge, and the other
clock does the same. In any case the main
challenge is to generate the correct flow
of data, without layout timing skews,
not to generate a single-source clock line.
With the conventional clocking scheme the
RAMBUS bandwidth would require a simple
800MHz clock, and therefore it is a "800MHz
data bus". The employment of some tricky
clocking scheme does not change the fact
that the RAMBUS timing requirements are
exactly 8 times higher than requirements
for the conventional PC-100 memory. Not 4x
as some learning-challenged managers and
simple thread morons tend to think.
My point is that the 8x jump is too harsh
for mass production technology.

Regards,
- Ali
Report TOU ViolationShare This Post
 Public ReplyPrvt ReplyMark as Last ReadFilePrevious 10Next 10PreviousNext  

HomeMailHotSubjectMarksPeopleMarksKeepersSettings
Terms Of UseContact UsCopyright/IP PolicyPrivacy PolicyAbout UsFAQAdvertise on SI
© 2025 Knight Sac Media.  Data provided by Twelve Data, Alpha Vantage, and CityFALCON News