AX88871AP ASIX [ASIX Electronics Corporation], AX88871AP Datasheet - Page 16

• Manufacturer Part Number: AX88871AP
• Description: 10/100BASE Dual Speed Bripeater Controller
• Manufacturer: ASIX [ASIX Electronics Corporation]

3.1 Repeater State Machine
states. 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.
Data Forwarding State
The state happens when these conditions exists:
a. Only one signal asserted among CRS[7:0] and DCRS in single chip application.
b. Only one of IR_ACTO[7:0] become low if in cascade application.
3.2 RXE /TXE CONTROL
The repeater state machine stores receiving packet and transmits to all other ports except for
Collision State
The repeater state machine is used to control repeater behavior, generates right signal in corresponding
The Collision State happens when these conditions exists:
One Port Left State
idle State
The idle state happens when these conditions exists:
Collision state
One Port Left state
AX88871AP Bripeater
Idle state
Data Forwarding state
The repeater sends jam pattern to all ports.
a.
b.
c.
The state happens only when there is no collision but still one port which experienced collision
has receive activity. The repeater remains send collision pattern to all ports except the port.
The repeater sends no data to any port.
If ACTIVE(X) = 1, X is the local connected port,
If ACTIVE(X) = 1, X is the inter repeater port,
1.
2.
a.
b.
c.
/RST is low.
All CRS[7:0] and DCRS are not asserted high in single chip application.
/IR_ACTO[7:0] remains high.
The port is jabbered.
The port is isolated.
There are two or more signals asserted high among CRS[7:0] and DCRS in single chip system.
There are two or more signals asserted low among /IR_ACTO[7:0] in cascade system.
Only one carrier exists but RXDV still low exceeds 4 clock cycles.The repeater sends
collision pattern to all ports.
RXE(ALL) = 0, RXE_IR = 0.
TXE(ALL) = 1, TXE_IR = 0.
Repeater sense no inter repeater active signal in cascade application, that is, all
RXE(ALL) = 0, RXE_IR = 0.
TXE(ALL) = 0, TXE_IR = 0.
RXE(X) = 1, RXE(ALL-X) = 0, RXE_IR = 0.
TXE(X) = 0, TXE(ALL-X) = 1, TXE_IR = 1.
RXE(ALL) = 0, RXE_IR =1.
TXE(ALL) = 1, TXE_IR = 0.
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