Abit KD7-B User Manual page 56

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Precharge to Active (Trp):
Trip timing value (Precharge time – time from precharge command to when back can be activated).
Active to Precharge (Tras):
Tras timing value = Minimum bank active time from activate to precharge of same bank.
Active to CMD (Trcd):
Trcd timing value = RAS to CAS latency + rd/wr command delay
DRAM Burst Length
DDR SDRAM modules provide a Burst mode that means an auto precharge function for programmable
READ or WRITE burst lengths of 4 or 8 locations.
This means that if we set burst length to 8, the address bus will acesss 8 bytes each cycle to precharge,
etc.
DRAM Queue Depth:
Three options are available: 2 Level
DRAM queue depth to accommodate maximum memory throughput.
DQS Drive Strength:
Four options are available: Auto
adjust the DQS signal drive strength for data sent to DDR SDRAM. More DDR SDRAM DIMM installed,
you may set it to High.
DDR DQS Input Delay:
Two options are available: Auto or Manual. The default setting is Auto. If you set to Manual, then the
next item will be available.
Input Delay Value:
This item allows you to adjust the data input strobe delay time of memory. You can key in the HEX
number into this section. The minimum number is 0000, and maximum number is 00FF.
DDR DQS Output Delay:
Two options are available: Auto or Manual. The default setting is Auto. If you set to Manual, then the
next item will be available.
Output Delay Value:
This item allows you to adjust the data output strobe delay time of memory. You can key in the HEX
number into this section. The minimum number is 0000, and maximum number is 00FF.
MD Drive Strength:
Two options are available: Auto or Manual. The default setting is Auto. If you set to Manual, then the
next item will be available.
KD7 Series
4 Level 3 level. The default setting is 4 Level. This item sets
Low Medium High. The default setting is Auto. This item can
Chapter 3