The DSP1629 is Lucent Technologies Microelectronics Group's first digital signal processor offering 100 MIPS operation at 3.0 V and 80 MIPS operation at 2.7 V with a reduction in power consumption. Designed specifically for applications requiring low power dissipation in digital cellular systems, the DSP1629 is a signal-coding device that can be programmed to perform a wide variety of fixed-point signal processing functions. The device is based on the DSP1600 core with a bit manipulation unit for enhanced signal coding efficiency. The DSP1629 includes a mix of peripherals specifically intended to support processing-intensive but cost-sensitive applications in the area of digital wireless communications. The DSP1629x16 contains 16 Kwords of internal dualport RAM (DPRAM), which allows simultaneous access to two RAM locations in a single instruction cycle. The DSP1629x10 supports the use of 10 Kwords of DPRAM. Both devices contain 48 Kwords of internal ROM (IROM). The DSP1629 is object code compatible with the DSP1627 while providing more memory. The DSP1629 is pin compatible with the DSP1627. Note that TRST (JTAG test reset) replaces a VDD pin. The DSP1629 supports 2.7 V, and 3.0 V operation and flexible power management modes required for portable cellular terminals. Several control mechanisms achieve low-power operation, including a STOP pin for placing the DSP into a fully static, halted state and a programmable power control register used to power down unused onchip I/O units. These power management modes allow for trade-offs between power reduction and wake-up latency requirements. During system standby, power consumption is reduced to less than 20 A. The on-chip clock synthesizer can be driven by an external clock whose frequency is a fraction of the instruction rate.