IP113F datasheet(11/46 Pages) ETC2

11 / 46 page

IP113F

Preliminary Data Sheet

Functional Description

Data forwarding

IP113F 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. IP113F begins to

forward the received data when it receives the frame completely. The latency depends on the packet

length.

Modified cut-through mode

IP113F 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 is up to1600 bytes in this mode. Please refer to pin

description of FAST_FWD for configuration information.

Pure converter mode

IP113F 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 MIIs and the internal switch engine and data buffer are not

used. TP port should be forced at 100M in this application. The packet length is not limited at this mode.

Please refer to pin description of DIRECT_WIRE for configuration information.

Fragment forwarding

IP113F forwards CRC error packets but it will filter fragments when it works in modified cut-through mode.

IP113F forwards fragments if user turns on bit 3 of MII register 20.

TP port force mode

The TP port of IP113F can work at auto mode or force mode. The following table shows all of the

combination of its TP port.

TP_FORCE

SPEED_MODE

DUPLEX_MODE

IP113F’s capability

100/10M, Full/Half with auto-negotiation

100/10M, Half with auto-negotiation

10M, Full/Half with auto-negotiation

10M, Half with auto-negotiation

100M, Full with auto-negotiation

100M, Half with auto-negotiation

10M, Full with auto-negotiation

10M, Half with auto-negotiation

Confidential.

11/46

Aug. 20, 2003

IP113F-DS-R02

IP113F датащи(PDF) 11 Page - List of Unclassifed Manufacturers