A method for transferring data between plural devices and a memory having address areas associated with the plural devices. The method includes the steps of sequentially reading out the functional information from a table memory having the functional information indicating plural functions concerning the accessing to the devices and control operations, selecting the functions corresponding to the read-out functional information, and performing a control operation in accordance with the selected functions. An apparatus for transferring data between plural devices and a memory having address areas associated with these plural devices is also disclosed. With the present method and apparatus, data transfer may be performed flexibly in order to comply with the request for a dedicated operation or in order to eliminate wasteful time consumption for a time frame during which the operation is at a standstill.

The invention is a novel method enabling a base station receiver to quickly and accurately validate a coded digital verification color code (CDVCC) vector received from a mobile station against a locally stored CDVCC vector identifying the cell to which it belongs. At the base station receiver, the received signal is sampled at twice the transmitted symbol rate, producing complex-valued samples of the received symbol envelope. These contain the received CDVCC vector and a known SYNC vector, and are assumed to have undergone dispersion characterized by several dispersion coefficients. The SYNC vector is detected with relative ease, allowing the establishment of a reference sample time. This is followed by the receiver determining a plurality of possible starting times (or "shifts") for the CDVCC vector relative to the reference sample time. These shifts preferably cover the time advances or delays that the CDVCC vector may have undergone due to dispersion, relative to the position of the SYNC vector as detected. For each of the possible shifts, the dispersion coefficients are estimated a number of times and a metric is derived, which is a measure of the variation in the estimates of the dispersion coefficients. Since the dispersion coefficients are not expected to change significantly throughout the duration of the CDVCC, a low value for the metric should be reached when the received CDVCC vector matches the locally stored CDVCC vector for at least one of the possible CDVCC vector shifts.

Modulator especially for digital cellular telephone systems, characterised in that it comprises a programmable peripheral processor (25) carrying out, with the same circuits, the modulation function and the channel coder/decoder tasks.

A data transfer device for transferring data between a plurality of digital signal processors in a system utilizing time division multiple access techniques. The data transfer device includes a system controller coupled to a bus network, a plurality of dual port random access memories, and a direct memory access controller. Each dual port random access memory device includes a first input/output port coupled to one of the plurality of digital signal processors, and a second input/output port coupled to the bus network. Each of the plurality of digital signal processors can access the dual port random access memory device coupled thereto during a first predefined time within a TDMA cycle. During a second predefined time period within the same TDMA cycle, the direct memory access controller, under control of the system controller, transfers data directly between the dual port random access memory devices. During a third predefined time period within the same TDMA cycle, the system controller can access the dual port random access memory devices coupled thereto.