Optimized synchronous data reception mechanism

An apparatus that compensates for misalignment on a synchronous data bus, the apparatus comprising:

• a resistor network, coupled to a motherboard, configured to provide a ratio signal that indicates an amount to delay data bit signals associated with a data group;
• and
• a microprocessor, coupled to said motherboard, wherein said ration signal enters said microprocessor through an external pin, said microprocessor comprising:
• a composite delay element, configured to equalize delay paths within said microprocessor, wherein said delay paths correspond to a data strobe signal that is received from a transmitting device;
• and
• delay-locked loops (DLLs), coupled to said ratio signal, configured to generate delayed data bit signals, wherein said DLLs add said amount of delay to said data bit signals to generate said delayed data bit signals, and wherein said data bit signals are delayed in phase by said amount, and wherein said amount ranges from no phase delay up to an advance of one half cycle of said data strobe signal, and wherein said delayed data bit signals and said data strobe signals are provided to synchronous receivers that are configured to detect states of said delayed data bit signals, and wherein said composite delay element comprises a plurality of delay elements, each of which is associated with a corresponding one of said synchronous receivers, wherein said each introduces a delay into a corresponding propagation path such that said corresponding propagation path is equal to a longest propagation path.

A method for compensating for misalignment on a synchronous data bus, the method comprising:

• coupling a resistor network to an input of a receiving device to provide a ratio signal that indicates an amount to delay a data bit signal associated with a data group, wherein the receiving device is coupled to a motherboard, and wherein the resistor network is coupled to the motherboard, and wherein the ratio signal enters the receiving device through an external pin;
• via a composite delay element disposed within the receiving device, equalizing delay paths within the device, wherein the delay paths correspond to a data strobe signal that is received by the receiving device from a transmitting device;
• and
• coupling delay-locked loops (DLLs) to the ratio signal, and generating delayed data bit signals, wherein the DLLs are disposed within the receiving device and add the amount of delay to the data bit signals to generate the delayed data bit signals, and wherein said data bit signals are delayed in phase by the amount, and wherein the amount ranges from no phase delay up to an advance of one half cycle of the data strobe signal, and wherein the delayed data bit signals and the data strobe signals are provided to synchronous receivers that are configured to detect states of the delayed data bit signals, and wherein the composite delay element comprises a plurality of delay elements, each of which is associated with a corresponding one of the synchronous receivers, wherein the each introduces a delay into a corresponding propagation path such that the corresponding propagation path is equal to a longest propagation path.