This preview shows page 1. Sign up to view the full content.
Unformatted text preview: ing call, and so on. The Ericsson-VLSI Bluetooth Baseband Controller 355 The data streams, which include the encoded voice data and the symbols transmitted and received over the radio link, pass directly between the Oak system and the peripheral interfaces. On-chip debug There are two heterogeneous processing systems on the chip. The on-chip debug hardware employs a single JTAG interface to access several debug features, including the ARM7TDMI EmbeddedlCE module, debug technology on the Oak DSP core, and other test and debug facilities. The battery life of a mobile telephone handset is a significant issue in the present market-place; 'talk-time' and 'standby' times feature prominently in product advertising. The OneC VWS22100 incorporates a number of power management features to optimize the performance of the product it controls: global and selective power-down modes; the ability to slow down the system clock in idle mode; the analogue circuits also can operate at reduced power; the on-chip pulse-width modulation outputs control battery charging; the on-chip analogue-to-digital converters (ADCs) provide for the monitoring of the temperature and battery voltage to give optimum operation. Power management GSM handset The typical hardware architecture of a GSM cellular telephone handset based around the OneC VWS22100 is illustrated in Figure 13.6 on page 356. 13.4 The Ericsson-VLSI Bluetooth Baseband Controller
Bluetooth is a de-facto standard for wireless data communication for the 2.4 GHz band developed by a consortium of companies including Ericsson, IBM, Intel, Nokia and Toshiba. The standard is intended to support short-range communication (from 10cm to 10m range) in a manner similar to that currently achieved with infrared communication using the IrDA standard, but avoiding the line-of-sight, alignment, and mutual interference restrictions of IrDA. Using radio communication, Bluetooth is intended to support laptop to cellular telephone, printer, PDA, desktop, fax machines, keyboards, and so on, and it can also provide a bridge to existing data networks. As such it serves as a c...
View Full Document
- Spring '09