The XRT7250 DS3/E3 Framer IC is designed to accept "User Data" from the Terminal Equipment and insert this data into the "payload" bit-fields within an "outbound" DS3/E3 Data Stream. Further, the Framer IC is also designed to receive an "inbound" DS3/E3 Data Stream (from the Remote Terminal Equipment) and extract out the "User Data". The XRT7250 DS3/E3 Framer device is designed to support full-duplex data flow between Terminal Equipment and an LIU (Line Interface Unit) IC. The Framer Device will transmit, receive and process data in the DS3-C-bit Parity, DS3-M13, E3-ITU-T G.751 and E3ITU-T G.832 Framing Formats. The XRT7250 DS3/E3 Framer IC consists of four sections. The Transmit Section, includes a Transmit Payload Data Input Interface, a Transmit Overhead data Input Interface Section, a Transmit HDLC Controller, a Transmit E3/DS3 Framer block and a Transmit LIU Interface Block which permits the Terminal Equipment to transmit data to a remote terminal. The Receive Section, consists of a Receive LIU Interface, a Receive E3/DS3 Framer, a Receive HDLC Controller, a Receive Payload Data Output Interface, and a Receive Overhead Data Interface which allows