Wideband Semiconductors, Inc.

Wideband Semiconductor, Inc.

Richard John Fagerlund

David Bruce Isaksen

Mark Fong

James P Flynn

Boris G Tankhilevich

Philip R Sanfilippo

An address locked loop (ALL) apparatus for address recycling is provided. The apparatus comprises a block of memory further comprising a plurality of buffers configured to store a plurality of incoming packets, an address stack configured for storing of a plurality of free addresses, an address locked loop (ALL) control block configured to provide an arbitrated interface with the address stack for filling address requests by a local process and for returning free addresses from the local process to the address stack, and a stack address counter configured to maintain count of the available free addresses remaining on the address stack.

Address locked loop

A method for digital clock smoothing is provided. The method comprises: (A) inputting an asynchronous data stream having an asynchronous symbol rate into a FIFO two-port memory block; (B) obtaining FIFO depth B by subtracting modulo B for each stored symbol a symbol output address from a symbol input address; (C) inputting FIFO depth B into a programmable look-up table (LUT); (D) obtaining a phase detector error signal; (E) scaling the phase detector error signal to obtain a scaled error factor; (F) adding the scaled error factor to a nominal phase step to obtain a phase update; (G) obtaining a smoothed symbol rate; and (H) reading out each output symbol from FIFO under control of an output FIFO address control register at the smoothed symbol rate.

Digital clock smoothing

A method for digital clock smoothing comprising: (A) inputting an asynchronous data stream having an asynchronous symbol rate into a two-port memory block; (B) accumulating a plurality of symbols of the asynchronous data stream in the two-port memory block for a predetermined time period; (C) computing an average symbol rate for the input asynchronous data stream; (D) generating a clock error signal equal to the difference between the average symbol rate of the input asynchronous data stream and a nominal output synchronous clock; (E) obtaining a smoothed symbol rate clock by using the error clock signal; and (F) generating an output smoothed data stream having the smoothed symbol rate clock.

Growing community of inventors

San Jose, CA, United States of America

Richard John Fagerlund