Abstract: A data processor (40) includes source (60) and destination (61) address generation units (AGUs) to update source and destination addresses for efficient digital signal processing (DSP) functions. The data processor (40) includes an instruction decoder (41) which recognizes a bit movement instruction, which is frequently encountered in data interleaving operations. In response to the bit movement instruction, the instruction decoder (41) causes the source (60) and destination (61) AGUs to update their present addresses using variable offset values. The instruction decoder (41) further causes a bus controller (44) to convert these bit addresses to corresponding operand addresses and bit fields. The bus controller (44) accesses source and destination operands using the operand addresses. The instruction decoder (41) then causes an execution unit (45) to transfer a bit from the source operand indicated by the source bit field to a bit position of the destination operand indicated by the destination bit field.

Abstract: A circular buffer address generation unit (630) may be accomplished by first determining a potential next address (635) based on a current address (644) and an address offset value (646). Having established the potential next address (635), the potential next address (635) is compared with an ending address (640) of the circular buffer. When the potential next address compared favorably with the ending address, use the potential next address as a new address (650), otherwise generate the new address (650) from a beginning address (642) of the circular buffer.

Abstract: A DSP co-processor (72) that is used on an integrated circuit (24) that provides multiple communication functions is accomplished by providing a data bus interface (320), a sequencer (328), internal memory (33), and a data core (322). The sequencer (328) stores in a hardware format a signal processing algorithm (332) and, upon receipt of an operational command, provides address control signals (334) and operation control signals (336) to the data core (322). The data core (322), which includes an address generation unit (340) and an arithmetic unit (344), executes, via the arithmetic unit, operational instructions of the signal processing algorithm to produce resultant signals from the input samples, the intermediate resultants, and the algorithm co-efficients.

Abstract: An integrated circuit that provides multiple communication functions is accomplished by providing an integrated circuit (24) that includes memory (70) which stores an audio code algorithm, echo cancellation information, a modem processing algorithm, and audio data. The memory (70) is coupled via a data bus (50) to a signal converter (56), a central processing unit (58), and a first co-processor (72). The signal converter (56) provides an analog-to-digital input port (78) and a digital-to-analog output port (80) for the integrated circuit (24), wherein the audio data is received via the analog-to-digital input port (78). The central processing unit (58) executes at least a first portion of the audio coding algorithm upon the audio data and executes a first portion of the modem processing algorithm, while the first co-processor (72) executes an echo cancellation algorithm.

Abstract: In a decoding apparatus (100), overflow conditions can be determined within the same clock cycle by determining the type of operation to be performed. For time sensitive operations, a load (102) and a discharge device (105) are temporarily coupled to a dynamic decoding structure (101) of the decoding apparatus (100). The load (102) and the discharge device (105) allow the decoding apparatus (100) to stabilize within a first clock phase (114) of a clock cycle. Thus, the second phase (113) of the clock cycle can be used to determine whether an overflow condition has occurred. For non-time sensitive operations, a precharge device (104) and the discharge device (105) are operably coupled to the dynamic decoding structure (101), while the load (102) is disabled.