參數(shù)資料
型號(hào)： AX88872P
廠商： ASIX Electronics Corporation
英文描述： 10/100BASE Dual Speed “Swipeater” Controller
中文描述： 一個(gè)10/100Base雙速“Swipeater”控制器
文件頁(yè)數(shù)： 18/36頁(yè)
文件大?。?/td> 399K
代理商： AX88872P
ASIX ELECTRONICS CORPORATION
18
CONFIDENTIAL
AX88872P Swipeater Controller PRELIMINARY
3.0 Functional Description
3.1 Repeater State Machine
The repeater state machine is in idle state when there
is no carrier presented on any ports
.
When there is only
one port has receive activity, the repeater state machine will enter data -forwarding state to ensure correct
data forwarding to other connected ports. If collision happens anytime, The repeater state machine detects
collision
then send jam pattern to all ports until collision ceases.
3.2 RXE /TXE Control
Idle state
CRS_DV(ALL) = 0, the repeater sends no data to any port.
RXE(ALL) = 0.
TXE(ALL) = 0.
Data Forwarding state
If CRS_DV(ALL) = 1, N is the only one port that has incoming packet.
RXE(N) = 1, RXE(ALLXN) = 0.
TXE(N) = 0, TXE(ALLXN) = 1.
Collision state
If CRS_DV(ALL) > 1, the repeater sends jam pattern to all ports.
RXE(ALL) = 0.
TXE(ALL) = 1.
One Port Left state
When all packets are back off except only one port still has activity, that is CRS_DV(ALL) = 1 again . N is the
only one left port that has incoming packet. The repeater sends jam pattern to all other port except for the still
activity ports.
RXE(ALL) = 0.
TXE(ALLXN) = 1.
3.3 Jabber State Machine
To prevent an illegally long reception of data from reaching the repeater unit, each port has its own jabber
timer. If a reception exceeds this duration (64K bit times for AX88872), the jabber condition will be detected.
In this condition, repeater unit will disable receive and transmit packets for the jabbered port and the other ports
remain the normal operation.
When the carrier is no longer detected for the jabbered port or reset the repeater, the jabber state will be existed
and the port will receive and transmit packets normally.
3.4 Partition State Machine
The partition state machine is used to protect network from being upset when a port suffer continuous
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