IP113A LF
Preliminary Data Sheet
11/22
April 9, 2007
Copyright © 2004, IC Plus Corp.
IP113A LF-DS-R08
2.
Functional Description
Data forwarding
IP113A LF supports three types of data forwarding mode, store & forward mode, modified cut-through
mode and pure converter mode. It can forward a frame despite of its address and CRC error. IP113A LF
begins to forward the received data only after it receives the frame completely. The latency depends on
the packet length.
Modified cut-through mode
IP113A LF begins to forward the received data when it receives the first 64 bytes of the frame. The
latency is about 512 bits time width. The maximum packet length can be up to1600 bytes in this mode.
Please refer to the pin description of FAST_FWD for configuration information.
Pure converter mode
IP113A LF operates with the minimum latency in this mode. The transmission flow does not wait until
entire frame is ready, but instead it forwards the received data immediately after the data being received.
Both transceivers are interconnected via internal MII signals, therefore the internal switch engine and
data buffer are not used. Both TP port and fiber port of IP113A LF should work at 100M full duplex in this
mode. If TP port is linked at half duplex, the total length of UTP cable and fiber should be less than 60
meters to meet the requirement of CSMACD in IEEE802.3.The packet length is not limited at this mode.
Please see pin description of DIRECT_WIRE for configuration information.
Fragment forwarding
IP113A LF forwards CRC error packets but it will filter fragments when it works in modified cut-through
mode. IP113A LF forwards fragments if user turns on bit 3 of EEPROM register 2.
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