I am not an electronics guy (CS guy) I understand what TCP/IP is I want to know what things are done in manufacturing an IC that is able to send and receive packets. How is a chip which works for sending receiving TCP/IP signals made.What are the things which exist on it and it is different from a USB chip.What are the essential difference from the point of view of hardware.Basically what I want to know how is TCP/IP protocol suit converted to an equivalent electrical circuit.What chips/ic's are working on routers,lan cards etc...and how do they work.
As a few of the comments referred to, TCP/IP is a high level protocol that specifies how packets of data are sent and received. In fact, TCP sits on top of IP. These are actually separate from the lower level communications. For example you can have TCP/IP run on top of Ethernet which is the PHY (physical layer) specified by IEEE 802.3 specification. Also, it can run on top of 802.11 which is best known as WLAN (this forms the basis of WiFi). You could even run it on top of Infrared (802.11 actually specifies this) and several other PHYs. The following information should be helpful, especially the two app notes that are very practical instead of theoretical (as the spec would be).