Intel Corporation

Khushal Chandan

Michael J Allen

Fangxing Wei

Setul M Shah

Dan Shi

Digital delay locked loop circuits, devices systems, and associated methods are provided and described. Such devices, systems, and methods utilize an open loop measurement for establishing a coarse delay lock.

Coarse delay lock estimation for digital DLL circuits

Phase compensation in an I/O (input/output) circuit includes variable, programmable slope. A phase compensation circuit can apply phase compensation of one slope and dynamically change the slope of the phase compensation to allow for better tracking of environmental conditions. The phase compensation circuit can generate a linear code to apply phase compensation to lock phase of an I/O signal to a phase of a timing signal. The circuit selectively adjusts the linear code with a variable, programmable slope, where the slope defines how much phase compensation is applied per unit change in the linear code. The circuit applies the adjusted linear code to a lock loop to lock the phase of the I/O signal to the phase of the timing signal.

Digital phase control with programmable tracking slope having a programmable linear decoder using a coarse code and a fine code to generate delay adjustments to the phase of an input signal

Digital phase control with programmable tracking slope

Phase compensation in an I/O (input/output) circuit includes a triangular control contour with a simplified generation circuit. A linear control circuit can generate a digital N-bit linear count, and route the least significant M bits [(M&#x2212;1):0] for linear control for fine delay mixing of a phase compensation loop and the most significant (N&#x2212;M) bits [(N&#x2212;1):M] for linear control for coarse control of a delay chain for the phase compensation loop. Prior to decoding the least significant M bits for fine delay mixing, the control circuit performs a bitwise XOR (exclusive OR) of bit M with each of bits [(M&#x2212;1):0] to generate M linear control bits as the linear control for fine delay mixing. The M linear control bits generate a linear control count having a triangular contour, where the linear control count continuously, repeatedly counts from 0 to (2&#x2212;1) to 0.

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Folsom, CA, United States of America

Khushal Chandan