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Technology Stocks : Rambus (RMBS) - Eagle or Penguin
RMBS 101.61+2.8%Dec 5 9:30 AM EST
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To: Brian1970 who wrote (29071)9/9/1999 4:39:00 PM
From: grok   of 93625
 
Latency means how long do you have to wait to get one. (Bandwidth means how many can you keep coming continuously.)

In a dram there are two types of latencies: CAS and RAS. CAS is shorter than RAS but you can only use it if you've already asked for something nearby. CAS stands for Column Access Strobe and RAS stands for Row Access Strobe.

CAS Latency = 2 is also called CL2 and means that data is provided in 2 cycles. CL3 means 3 cycles. Thus, CL2 is faster than CL3. The speed of an sdram is determined by two things: frequency and latency. Everyone understands frequency because it is provided in the name, eg, PC133 means 133 MHz which means 133 million cycles per second. (One cycle would be 1/133 million which is 7.5 nS which is 7.5 billionths of a second.)

Everyone talks about PC100 vs PC133 but few people talk about CAS Latency. It kind of gets lost in the fine print. The fastest sdram today is PC133 with CL2. The slowest in large production today is PC100 with CL2. There are also PC133 with CL3 in production today and this is what the Samsung Whitepaper uses.

Rambus Direct Rdrams also come in different frequencies and latencies. The Whitepaper is based on the fastest Rdram in both frequency and latency while it uses the fastest sdram frequency but not the fastest sdram latency. So it is bogus.

How's that?????????????
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