Overview
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   This EOPM84 is a LAN to WAN converter that provides conversion from 4 10/100M Ethernet to multiple E1 frame. The EOPM84 provides 100M bits/s interface with 2.5M bits/s control bus (MDIO). The EOPM84 support standard based GFP Frame encapsulation/de-capsulation with
    (X 43 +1) scramble and optional FCS (32-bit CRC) and LCAS support . Maximum 4FE /4 VCG support . Can be programmed as 8E1/1VCG , 4E1/1VCG , 2E1/1VCG , 1E1/VCG .
The 100M External 16-bit SDRAM interface is employed to buffer the burst FE traffic from MII.
Maximum 2K-byte and minimum 64-byte Ethernet lengths are checked. The illegal FE packets such as CRC-error packet and runt/over- size packet can be optional dropped or pass through.
    The framer block will search E1 frame in either  CRC-4 multi-frame or non-CRC4 frame-mode.  The EOPM84 provides alarm reports for LOS, LOF, AIS, RAI (Far-End Failure) and LOM (loss of CRC-4 Multi-frame). It also provides code-violation, frame-error, and E-bit counters for performance monitoring. 

1.	Support both CRC4 and non-CRC4 frame mode for E1. Maximum 8E1 .
2.	Maximun 4 FE (4 VCG ) support .
3.	Support full duplex RMII interface with IEEE 802.3 flow control .
4.	Multiple E1 Virtual Concatenation per ITU-T G.8040/G.7043
5.	GFP (Generic Framing Procedure) Encapsulation/De-capsulation per ITU-T G.7401
6.	LCAS support per ITU-T G.7042
7.	Built-in 100M 16-bit SDRAM controller to handle burst Ethernet traffic.
8.	Support FE RMII microprocessor interface. Internal 16bits uP control .
9.	Low power 3.3V I/O and 2.5V/1.2V core.

1.	Media Converter
2.	Ethernet Over PDH Network
3.	CSU/DSU
4.	IPDSLAM

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