Motorola Corporation

Jody H Everett

Michael R May

Mathew A Rybicki

Matthew A Pendleton

Carlos A Greaves

Howard E Levin

Peter R Molnar

Terence L Johnson

Sujit Sudhaman

Jeffrey P Gleason

John M Porter

Robin Wiprud

A transceiver (5) for an asymmetric communication system such as asymmetric digital subscriber line (ADSL) includes a configuration register (71) defining operation at either a central office (CO) or a remote terminal (RT). The configuration register (71) includes a control bit (72) for selecting either CO or RT mode. The transceiver (5) includes a signal processing module (70) configured according to the state of the control bit (72). For example, a digital interface (70) converts transmit data into transmit symbols and converts received symbols into receive data. The digital interface (70) uses a large memory (158) as a buffer in the transmit path and a small memory (160) as a buffer in the receive path in CO mode. In RT mode, the digital interface (70) uses the small memory (160) in the transmit path and the large memory (158) in the receive path. The selective configuration allows a single integrated circuit to be used in both CO and RT equipment.

Single-chip software configurable transceiver for asymmetric

A frequency divider circuit for dividing an input signal with a predetermined integer or non-integer divisor. The frequency divider circuit comprises a polynomial counter, decode logic, and a clock edge selector. The polynomial counter, responsive to a clock signal at a predetermined frequency, cycles through a predetermined set of logic states which are logical combinations of the previous state, and generates a set of output signals which indicates the present logic state of the polynomial counter. The decode logic, responsive to the output signals of the polynomial counter, implements a predetermined logical mapping of said output signals into a decoded output signal. The clock edge selector, responsive to the decoded output signal of the decode logic, utilizes flip-flops and other logic to generate integer and non-integer multiples of the clock signal. The frequency divider circuit selects either integer or non-integer divisors depending on the informational content of a control signal.

Frequency divider circuit with integer and non-integer divisors

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Buda, TX, United States of America

Jody H Everett