lib_xtcp is a library providing implementations of the Ethernet transport layer, designed to support host-to-host network communication by handling data exchange typically using TCP or UDP protocols. It provides a software defined Ethernet transport stack implementation that connects to and runs on the XMOS Ethernet library lib_ethernet to support layer-4 traffic over Ethernet via MII or RGMII, at 10/100/1000 Mb/s Ethernet data rates.

The library provides two alternative TCP/UDP/IP protocol stacks for XMOS devices. See the following section for further details.

The TCP/IP stack used is the third-party lwIP (lightweight IP) stack ported to the xCORE architecture.. The lwIP stack is designed to provide good throughput and also has support for TCP windowing.

• TCP and UDP connection handling
• Common API to TCP/IP stack, LwIP
• TCP, UDP, DHCP, IP4LL, ICMP, IGMP
• Low level, event based interface for efficient memory usage
• Supports IPv4 only, not IPv6

• psock.c does output ftpgroup warnings. This does not affect operation. This is due to the stack not being calculable on code paths with a function pointer.

• lib_xtcp

• XMOS XTC Tools: 15.3.1

• lib_ethernet
• lib_otpinfo
• lib_logging
• lib_random
• lib_xassert

• AN00120: 100Mbps RMII ethernet application note
• AN00199: XMOS Gigabit Ethernet application note (XK_EVK_XE216)

The following application notes use this library:

• AN00121: A UDP loopback demo running on lib_xtcp application note
• AN02044: A UDP loopback demo running on lib_xtcp on XCORE-200-EXPLORER application note

This package is supported by XMOS Ltd. Issues can be raised against the software at http://www.xmos.com/support