AX88871AP datasheet(20/30 Pages) ASIX

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AX88871AP Bripeater

ASIX ELECTRONICS CORPORATION

4.0 INTERNAL REGISTERS

4.1 Configuration Register (CONFIG)

Bit

Bit Name

Access

Bit Description

D14

/HALF10

R/W

Half-duplex mode in 10Mbps : “low” resister to 10Mbps PHY in half-

duplex mode. “high” resister to 10Mbps PHY in full-duplex mode.

D13

OPT[0]

R/W

OPT[0] : Option for LED display. Default ‘high’ for normal operation.

User may pull the pin ‘low’ with 10K ohm resister to force 10M or 100M

LED disable when all the ports are the same speed condition.

D12

OPT[1]

R/W

OPT[1] : Option for partition schime. Default ‘high’ for normal

operation. User may pull the pin ‘low’ with 10K ohm resister to force

hardly enter partition state.

D11

TXM_MODE

R/W

TXM_MODE : Option for internal used. Default ‘high’ user may pull the

pin ‘low’ with 10K ohm resister for reserve transmition mode alternaty.

D10

OPT[3]

R/W

OPT[3] : Option for internal used. Please keep the pin with default value.

OPT[4]

R/W

OPT[4] : No Used.

OPT[6]

R/W

OPT[6] : Option for external device type to connect to port 6. Default

‘high’ is for PHY type device. Otherwise, ‘low’ for bridge, switch or

MAC type device.

OPT[7]

R/W

OPT[7] : Option for external device type to connect to port 7. Default

‘high’ is for PHY type device. Otherwise, ‘low’ for bridge, switch or

MAC type device.

MODE

R/W

MODE

= 0 : Single chip repeater application.

MODE

= 1 : Multiple chips cascaded repeater application.

ST_FW

R/W

ST_FW

= 0 : fragment-free mode

ST_FW

=1 : Store-n-Forward mode

ENTRIES

R/W

ENTRIES

= 0 : 1024 entries supported

ENTRIES

= 1 : 256 entries supported

D3-2

MEM_SIZE[1]

MEM_SIZE[0]

R/W

MEM_SIZE[1] MEM_SIZE[1]

SIZE (K)

32K

64K

128K

256K

/IR_ACT_EN

R/W

Inter Repeater Active Input Pin Enable : This input active low to enable

/HIR_ACTI[7:0] pins as inter-repeater carrier sense detection input.

Otherwise, /HIR_ACTI[7:0] pins are disabled.

/DIS_DAISY

R/W

/DIS_DAISY : Default pull-up to enable daisy chain function. To disable

daisy chain function pull the pin down external.

4.2 Repeater ID Register

Bit

Bit Name

Access

Bit Description

D2-D0

RID[2:0]

R/W

Repeater ID : At the rising edge of /RST , the value of RID[2:0] are

latched in this register as D[2:0]. The setting of RID[2:0]can be override

according to the data from serial daisy-chain DAISY_IN pin input .

Note that in system application, the maximum of 8 devices can be

cascade.

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