Z87L10

The Z87010/Z87L10 is a second generation CMOS Digital Signal Processor (DSP) that has been ROM-coded by Zilog to provide full-duplex 32 Kbps, Adaptive Delta Pulse Code Modulation (ADPCM) speech coding/decoding (CODEC), and interface to the Z87000/Z87L00 Spread Spectrum Cordless Telephone Controller. Together the Z87000/Z87L00 and Z87010/Z87L10 devices support the implementation of a 900 MHz frequency-hopping spread spectrum cordless telephone in conformance with United States FCC regulations for unlicensed operation.

The Z87010 and Z87L10 are distinct 5V and 3.3V versions of the ADPCM Audio Encoder/Decoder. For the sake of brevity, all subsequent references to the Z87010 in this document also are applicable to the Z87L10, unless specifically noted.

The Z87010's single cycle instruction execution and Harvard bus structure promote efficient algorithm execution.

The processor contains a 4K word program ROM and 512 word data RAM. Six dual operand fetching. Three vectored interrupts are complemented by a six level stack. The CODEC interface enables high-speed transfer rate to accommodate digital audio and voice data. A dedicated Counter/Timer provides the necessary timing signals for the CODEC interface. An additional 13-bit timer is dedicated for general-purpose use.

The Z87010's circuitry is optimized to accommodate intricate signal processing algorithms and is used here for speech compression/decompression, generation of DTMF tones and other cordless telephone functions. Dedicated  hardware allows direct interface to a variety of CODEC ICs. As configured by the Zilog-provided embedded software for digital cordless phones, the Z87010 supports a low-cost 8-bitm-law telephone CODEC. The Z87010 is to be used with the Z87000 and operates at 16.384 MHz, providing 16 MIPS of processing power needed for the cordless telephone application.