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GWIXC1100BCT 数据表(PDF) 20 Page - Intel Corporation |
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GWIXC1100BCT 数据表(HTML) 20 Page - Intel Corporation |
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20 / 134 page  Intel® IXP42X Product Line of Network Processors and IXC1100 Control Plane Processor March 2005 Datasheet 20 Document Number: 252479, Revision: 005 2.1 Functional Units The following sections briefly describe the functional units and their interaction in the system. For more detailed information, refer to the Intel® IXP42X Product Line of Network Processors and IXC1100 Control Plane Processor Developer’s Manual. Unless otherwise specified, the functional descriptions apply to all processors in the IXP42X product line and IXC1100 control plane processors. Refer to Table 3 on page 14 and Figure 1 on page 15 through Figure 5 for specific information on supported interfaces 2.1.1 Network Processor Engines (NPEs) The network processor engines (NPEs) are dedicated-function processors containing hardware coprocessors integrated into the IXP42X product line and IXC1100 control plane processors. The NPEs are used to off-load processing functions required by the Intel XScale core. These NPEs are high-performance, hardware-multi-threaded processors with additional local- hardware-assist functionality used to off-load highly processor-intensive functions such as MII (MAC), CRC checking/generation, AAL 2, AES, DES, SHA-1, and MD5. All instruction code for the NPEs are stored locally with a dedicated instruction memory bus and dedicated data memory bus. These NPEs support processing of the dedicated peripherals that can include: • A Universal Test and Operation PHY Interface for ATM (UTOPIA) 2 interface • Two High-Speed Serial (HSS) interfaces • Two Media-Independent Interfaces (MII) Table 4 specifies which devices, in the IXP42X product line and IXC1100 control plane processors, have which of these capabilities. The NPE core is a hardware-multi-threaded processor engine that is used to accelerate functions that are difficult to achieve high performance in a standard RISC processor. Each NPE core is a 133 MHz processor core that has self-contained instruction memory and self-contained data memory that operate in parallel. Table 4. Processor Functions Device UTOPIA HSS MII 0 MII 1 AES / DES / DES3 Multi-Channel HDLC SHA-1 / MD-5 Intel® IXP425 Network Processor , B-Step XX X X X 8 X Intel® IXP423 Network Processor XX X X 8 Intel® IXP422 Network Processor XX X X Intel® IXP421 Network Processor XX X 8 Intel® IXP420 Network Processor XX Intel® IXC1100 Control Plane Processor XX |
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