IP175G datasheet(45/69 Pages) ETC2

45 / 69 page

IP175G/GI/GH/GHI

Data Sheet

45 / 69

November 27, 2012

IP175Gx-DS-R01.3

PHY

MII

ROM

R/W

Description

Default

1[6]

R/W

BF_STM_EN, Broadcast storm enable

1: enable

IP175G/GH drops the incoming packet if the number of

broadcast packet in queue is over the threshold.

0: disable

P(0)

AGING. Aging time of address table selection

An address tag in hashing table will be removed if this

function is turned on and its aging timer expires.

Aging time

note

no aging

30s

300s

default

1[3:2]

R/W

reserved

2’b10

1[1]

R/W

MODBCK. Turn on modified back off algorithm

The maximum back off period is limited to 8-slot time if this

function is turned on.

1: turn on, 0: turn off

1'b0

1[0]

2[0]

R/W

LEARN_DIS_PAUSE

0: Enable to learn the SMAC of the received PAUSE frame.

1: Disable.

1’b0

6.8

Test mode control registers

Table 14 Test mode control registers table

PHY

MII

R/W

Description

Default

Test mode control registers

2[15:10]

R/W

TMODE_SEL. Test mode selection

This function is for testing only. The default value must be adopted

for normal operation.

6’h00

2[8]

Reserved

2[7]

R/W

INPUT_FILTER

Packet is filtered in input port.

1: perform input filtering when queue full

0: no operation (default)

2[6:5]

R/W

HASH_MODE

MAC address table hashing mode

00: direct + CRC mapping (default)

11: direct mapping

2’b00

2[4:1]

Reserved

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