EM260-RTR datasheet(8/50 Pages) SILICONIMAGE

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EM260

120-0260-000M Rev 1.1

Page 8

The MAC interfaces the data memory to the RX and TX baseband modules. The MAC provides hardware-based

IEEE 802.15.4 packet-level filtering. It supplies an accurate symbol time base that minimizes the

synchronization effort of the software stack and meets the protocol timing requirements. In addition, it

provides timer and synchronization assistance for the IEEE 802.15.4 CSMA-CA algorithm.

The EM260 integrates hardware support for a Packet Trace module, which allows robust packet-based debug.

This element is a critical component of Ember Desktop, the Ember software IDE, providing advanced network

debug capability when coupled with the Ember Debug Adapter (ISA).

The EM260 integrates a 16-bit XAP2b microprocessor developed by Cambridge Consultants Ltd. This power-

efficient, industry-proven core provides the appropriate level of processing power to meet the needs of Silicon

Lab’s EmberZNet PRO ZigBee-compliant stack. In addition, the SIF module provides a non-intrusive

programming and debug interface allowing for real-time application debugging.

The EM260 exposes the Ember Serial API over either a SPI or UART interface, which allows application

development to occur on a Host platform of choice. The SPI interface uses the four standard SPI signals plus

two additional signals, nHOST_INT and nWAKE, which provide an easy-to-use handshake mechanism between

the Host and the EM260. The UART interface uses the two standard UART signals and also supports either

standard RTS/CTS or XON/XOFF flow control.

The integrated voltage regulator generates a regulated 1.8V reference voltage from an unregulated supply

voltage. This voltage is decoupled and routed externally to supply the 1.8V to the core logic. In addition, an

integrated POR module allows for the proper cold start of the EM260.

The EM260 contains one high-frequency (24MHz) crystal oscillator and, for low-power operation, a second low-

frequency internal 10 kHz oscillator.

The EM260 contains two power domains. The always-powered High Voltage Supply is used for powering the

GPIO pads and critical chip functions. The rest of the chip is powered by a regulated Low Voltage Supply which

can be disabled during deep sleep to reduce the power consumption.

EM260-RTR 数据表(PDF) 8 Page - Silicon image