Patent ID: 8108738
Filing Date: 2012-01-31
Classification: G06F

Abstract:
1. An apparatus for tracking a data eye window of a capture device receiving a plurality of data bit signals to be captured from a memory storage device, said capture device further receiving a strobe signal for latching the plurality of data bit signals at said capture device, said apparatus comprising: a balanced tree network comprising a plurality of inputs, each of the inputs for receiving at least one of said data bit signals input from the memory storage device in coordination with said strobe signal, the balanced tree network generating an output signal associated with said plurality of data bit signals; and a tapped inverter chain receiving said output signal for generating a persistent data eye signal; wherein said persistent data eye signal is used to adjust said strobe signal associated with data eye centering of said capture device; wherein said tapped inverter chain comprises: a serial connection of n number of inverter devices, each of the inverter devices providing a fixed delay time interval, and each of the inverter devices providing a respective output signal; n number of latch devices, each latch device being associated with a respective inverter device for latching a respective output signal from each of the inverter devices; and n−1 number of comparison devices, each comparison device receiving a respective latched output signal from one of the latch devices, each comparison device receiving a latched output signal of a next latch device, and each comparison device determining a presence or an absence of a transition at a delay element interval resolution; wherein n is an integer greater than 1.