Author: Jeroen van Dorp
Date: 02:40:12 12/17/99
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On December 16, 1999 at 23:15:12, Martin Grabriel wrote: >Hi >Can you teach me how to change the CAS Latency or speed? It's in the BIOS setup menu. Mostly the procedure is to start your computer and hit <del> of sometime F1 or F2. The computer tells you that at the start up screen "hit <---> to enter setup" or so. Select the "Chipset Feature Setup" and there you'll find it. But most BIOS versions will give you a message at startup when your CAS Latency time is wrong. Remember that roaming around in your BIOS can result in unexpected software glitches. Remember what you changed, and *that* you changed. To have any idea what you are changing, read the following: "CAS Latency is one of several performance related timings for SDRAM. This measurement is the time it takes to strobe in the Row Address, and to activate the bank. When a burst read cycle is initiated, the addresses are set up and RAS\ and CS\ (chip select) are held low on the next clock cycle (rising edge of CLK), thereby activating the sense amplifiers on the bank. A period of time equal to tRCD (RAS\ to CAS\ delay) must pass after which CAS\ and CS\ are held low (again, at the next clock cycle). After the time period for tCAC (column access time) has passed the first bit of data is on the output line and can be retrieved (at the next clock cycle). The basic rule is that CAS latency times the clock speed (tCLK) must be equal or greater than tCAC (or CL x tCLK >= tCAC). This means that the column access time is the limiting factor for CAS Latency." Jeroen ;-} ------------------------------- The ChessBrat at: jimvandorp@wxs.nl http://zip.to/jeroen ICQ#45740870 -------------------------------
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