What are the nominal casX subtimings?

JonJ678

JonJ678

JonJ678

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I'm trying to find a reference somewhere for what the subtimings at various cas values are supposed to be. Say, cas8 is normally 8-8-8-24-2t but most of the subtimings I've set to auto. I have a sense that these should be changed, mainly because the option is there, and I can use google to find out what each option is and roughly how they interact. However I can't find out what the settings are meant to be, assuming this is a valid concept.

Can anyone guess what I'm actually looking for and point me in the right direction?
 
Definitely interested. I didn't know the timings were a function of frequency, that makes things a bit more exciting. I'd be most interested in ddr3 triple channel 1333mhz as this is pretty close to what I'm running.

However if you happen to have a source available, datasheet/whitepaper/other which has many numbers on I'd be thrilled. With the intended subtimings at a range of frequencies I can interpolate for nonstandard frequencies like 1200mhz, it would be hours of happy analysis :D
 
do you have a messenger program? MSN? reason being its quite long winded. Drop me a pm with your msn if you have it or similar
 
DDR3-1333F - 7T

tRCD - 84 (10.500ns) 7T
tRP - 84 (10.500ns) 7T
tRAS - 288 (36.00ns) 24T
tRC - 372 (46.500ns) 31T
tRFC - 880 (110.000ns) 74T
tRRD - 48 (6.000ns) 4T
tWR - 120 (15.00ns) 15T
tWTR - 60 (7.500ns) 5T
tRTP - 60 (7.500ns) 5T
tFAW - 240 (30.000ns) 20T

DDR3-1333G - 8T

tRCD - 96 (12.000ns) 8T
tRP - 96 (12.000ns) 8T
tRAS - 288 (36.00ns) 24T
tRC - 384 (48.000ns) 32T
tRFC - 880 (110.000ns) 74T
tRRD - 48 (6.000ns) 4T
tWR - 120 (15.00ns) 10T
tWTR - 60 (7.500ns) 5T
tRTP - 60 (7.500ns) 5T
tFAW - 240 (30.000ns) 20T

DDR3-1333H - 9T

tRCD - 108 (13.500ns) 9T
tRP - 108 (13.500ns) 9T
tRAS - 288 (36.00ns) 24T
tRC - 396 (49.500ns) 33T
tRFC - 880 (110.000ns) 74T
tRRD - 48 (6.000ns) 4T
tWR - 120 (15.00ns) 10T
tWTR - 60 (7.500ns) 5T
tRTP - 60 (7.500ns) 5T
tFAW - 240 (30.000ns) 20T

DDR3-1333J - 10T

tRCD - 120 (15.000ns) 10T
tRP - 120 (15.000ns) 10T
tRAS - 288 (36.00ns) 24T
tRC - 408 (51.000ns) 34T
tRFC - 880 (110.000ns) 74T
tRRD - 48 (6.000ns) 4T
tWR - 120 (15.00ns) 10T
tWTR - 60 (7.500ns) 5T
tRTP - 60 (7.500ns) 5T
tFAW - 240 (30.000ns) 20T

Hope this helps.
 
Sorry mate, was away from home for a few days and largely deprived of internet access. I'll try to get you on msn once the missus has scarpered, should be from tomorrow.

Those numbers are much appreciated, thanks for posting them even though I hadn't replied. Good man :D
 
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