A bi-synchronous electronic device may include a FIFO memory circuit configured to store data, and a first digital circuit coupled to the FIFO memory circuit and configured to operate based upon a first clock signal and a write pointer, write a data burst to the FIFO memory circuit, thereby causing a jump in the write pointer to a new position, and write a burst indicator associated with the new position in the FIFO memory circuit. The bi-synchronous electronic device may include a second digital circuit coupled to the FIFO memory circuit and configured to operate based upon a second clock signal different from the first clock signal, read from the FIFO memory circuit based upon a read pointer, and synchronize the read pointer to the write pointer based upon the burst indicator.

A circuit and method for performing a Binary-to-Gray conversion are disclosed. A first binary signal represents a target value and a second binary signal is stored in a register. A set of binary candidate values are determined where the respective Gray equivalent of each binary candidate value has a Hamming distance of one from the Gray equivalent of the second binary value. One of the binary candidate values is selected as a function of the first binary signal and the second binary signal. The selected binary candidate value is provided at input to the register. An encoded signal is generated by determining the Gray encoded equivalent of the selected binary candidate value.

A circuit and method for performing a Binary-to-Gray conversion are disclosed. A first binary signal represents a target value and a second binary signal is stored in a register. A set of binary candidate values are determined where the respective Gray equivalent of each binary candidate value has a Hamming distance of one from the Gray equivalent of the second binary value. One of the binary candidate values is selected as a function of the first binary signal and the second binary signal. The selected binary candidate value is provided at input to the register. An encoded signal is generated by determining the Gray encoded equivalent of the selected binary candidate value.

Embodiments described herein provide a method for correcting a propagation delay induced error in an output of an asynchronous counter. An input clock is applied to the asynchronous counter. A gray-code count is generated by the asynchronous counter. The gray-code count is mapped to a binary count. An error component, indicative of a counting error induced by a propagation delay between the input clock and the binary count, is generated by taking an exclusive-OR operation over the gray-code count and the input clock. The error component is added to the binary count to generate an error-corrected binary count. The error-corrected binary count is output.

An arrangement for transferring a data signal (data_a) from a first clock domain (2) to a second clock domain (4) in a digital system. The arrangement has a signal input (6, 7) for receiving an input signal (data_a) from the first clock domain (2), means (6, 7) for storing the input signal (data_a), and means (12, 13) for transferring the input signal (data_a) to the second clock domain (4) following a transition in the clock signal (ck) of the second clock domain (4).

An asynchronous data transfer system includes a bus interface unit (BIU), a FIFO write logic module, a write pointer synchronizer, a write pointer validator, a FIFO read logic module, and an asynchronous FIFO buffer. The FIFO buffer receives a variable size data from the BIU and stores the variable size data at a write address. The FIFO write logic module generates a write pointer by encoding the write address using a Johnson code. The FIFO read logic module receives a synchronized write pointer at the asynchronous clock domain and generates a read address signal when the synchronized write pointer is a valid Johnson code format. The FIFO buffer transfers the variable size data to a processor based on the read address signal.

A Gray code counter is enabled to increment by greater than one and still obey a rule of only one bit of change. The Gray code counter has applicability, for example, with use with an arbiter to control a multi-input asynchronous FIFO usable to synchronize data transfers between asynchronous source and destination clock domains.