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Digital Locked Loop (DLL)

Common Options : Enabled, Disabled

Quick Review

The Digital Locked Loop (DLL) aligns the data strobe signal (DQS) with the data signal (DQ) to ensure proper data transfer of DDR, DDR2 and DDR3 memory. However, it can be disabled to allow the memory chips to run beyond a fixed frequency range.

When enabled, the digital locked loop circuit (DLL) will operate normally, aligning the DQS signal with the DQ signal to ensure proper data transfer. However, the memory chips should operate within the fixed frequency range supported by the DLL.

When disabled, the digital locked loop circuit (DLL) will not align the DQS signal with the DQ signal. However, this allows you to run the memory chips beyond the fixed frequency range supported by the DLL.

It is recommended that you keep this BIOS feature enabled at all times. The digital locked loop circuit plays a key role in keeping the signals in sync to meet the tight timings required for double data-rate operations.

It should only be disabled if you absolutely must run the memory modules at clock speeds way below what they are rated for, and then only if you are unable to run the modules stably with this BIOS feature enabled. Although it is not a recommended step to take, running without an operational DLL is possible at low clock speeds due to the looser timing requirements.

It should never be disabled if you are having trouble running the memory modules at higher clock speeds. Timing requirements become stricter as the clock speed goes up. Disabling the DLL will almost certainly result in improper operation of the memory chips.

 

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