external classification coprocessor to the SRAM interface, in which case the TLU will simply act as a proxy to the external coprocessor. The TLU can handle up to 64MB of external memory (arranged as 128MbX32 pins). QMU The integrated QMU (working in internal mode) can support up to 512 queues, which is considered adequate to satisfy the requirements of most applications. However, this queue-man- agement performance can be scaled by engaging the QMU in its external mode. By attaching the Q-5 TMC (a task that does not require glue logic), which we discuss in the following section, a very powerful quality of service (QoS) management platform can be achieved across the spectrum and over both IP and ATM applications. FP Through its programmability, the highly configurable FP offers the possibility of implement- ing a wide range of fabric parameters, such as cell size and self-routing headers, enabling control to be applied on a per-flow basis. It can also handle segmentation and reassembly (SAR) and inte- grated scheduling of up to 128 queues. The FP can run at 125 MHz with movement that is 64 bits wide (32-bit transmit [Tx]/32-bit receive [Rx]). It can support a bandwidth of up to 3.2 Gbps full duplex. Downloaded from Digital Engineering Library @ McGraw-Hill (www.digitalengineeringlibrary.com) Copyright © 2004 The McGraw-Hill Companies. All rights reserved. Any use is subject to the Terms of Use as given at the website. MOTOROLA'S C-PORT™ FAMILY OF NETWORK PROCESSORS MOTOROLA'S C-PORTTM FAMILY OF NETWORK PROCESSORS 127 It offers the flexibility of a broad spectrum of standard interfaces such as UTOPIA 2, UTOPIA 3, and 32-bit 125 MHz CSIX-L1. Without any glue logic, it interfaces to the Power X TeraChannel® fabric architecture and the IBM PowerPRSTM switch fabric family, which we discussed in Chapter 4, "IBM PowerNPTM." It can be further configured to support other proprietary fabrics. Interestingly, multiple C-5e network processors can be connected through their fabric interfaces to a common switch fabric. As a resu