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XPC855TZP50 Datasheet

  • XPC855TZP50

  • Controller Miscellaneous - Datasheet Reference

  • 15頁

  • ETC

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Advance Information
MPC855TTS/D
Rev. 0.1, 11/2001
MPC855T Communications
Controller Technical
Summary
The MPC855T communications controller is a member of the MPC8xx family targeted at cost
sensitive general purpose networking controller applications. The MPC855T can be used in a
variety of controller applications, excelling particularly in low cost communications and
networking products, such as SOHO routers, ADSL, and cable modems.
The MPC855T integrates three separate processing blocks. The 鏗乺st two, common with all
MPC8xx devices, are (1) a high-performance MPC8xx core, which is used as a
general-purpose processor for application programming and (2) a RISC communications
processor (CP) embedded in the communications processor module (CPM). All MPC8xx
devices will have an 8-KByte dual port RAM when the MPC855T is available. The third block
is a 10/100-Mbps Fast Ethernet controller with integrated FIFOs and bursting DMA. The
MPC855T鈥檚 Fast Ethernet controller is implemented independently, providing
high-performance Fast Ethernet connectivity without affecting the performance of the CPM.
Additionally, since the CPM of the MPC855T is based on the CPM of other MPC8xx devices,
support for ATM, HDLC, and the QMC (QUICC multichannel controller) multichannel
protocol is also provided. The QMC protocol enables the MPC855T to provide protocol
processing (through HDLC or transparent mode) for 32 time-division-multiplexed channels
(on TDM channel A) when the MPC855T is operated at 50 MHz. This support for
multichannel protocol processing, ATM and 10/100-Mbps Ethernet in one chip makes the
MPC855T ideal for cost sensitive networking and telecommunications systems.
1.1
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MPC855T Key Features
10/100-Mbps Ethernet support (Not available when using ATM over UTOPIA
interface)
鈥?Full compliance with the IEEE 802.3u standard for 10/100-Mbps
鈥?Support for three different physical interfaces
鈥?100-Mbps 802.3 media-independent interface (MII)
鈥?10-Mbps 802.3 media-independent interface
鈥?10-Mbps 7-wire interface
鈥?Support for half-duplex 100-Mbps operation (at 33-MHz system clock rate and
above)
鈥?Support for full-duplex 100-Mbps operation (at 50-MHz system clock rate and
The key features of the MPC855T are summarized as follows:

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