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IP178A

8-Port 10/100 Ethernet Integrated Switch

Unspecified 

(Advance Version)

IP178A

PIN Description (continued)

Pin no.

Label

Type

Description

Basic operation parameter setting of switch

170

BK_EN

IPH/O Backpressure enable

1: enable (default), 0: disable

This pin is input to set backpressure during reset. It becomes an output signal

MRXD2 after reset, if external MII port is enabled.

168, 169

167

BP_KIND[1:0]

X_EN

IPL/O Backpressure type selection

00: carrier base backpressure (default)

01: (reserved)

10: (reserved)

These two pins are input during reset. It becomes output signals MRXD0 and

MRXD1 after reset, if external MII port is enabled. IP178A supports carrier base

backpressure only.

IPH/O IEEE 802.3x flow control enable

1: enable (default), 0:disable

This pin is an input to set flow control during reset. It becomes an output signal

MCOL after reset, if external MII port is enabled.

163

BF_STM_EN IPL Broadcast storm enable

1: enable, 0: disable (default)

IP178A drops the incoming packet if the number of broadcast packet in queue is

over the threshold.

162

DROP16

IPL Drop the transmitting packet after 16 consecutive collisions

1: drop, 0: not drop (default)

161

TWOPART

IPH Turn on twopartD (Twopart)

1: enable (fixed), 0: disable

IP178A examine the carrier for 64 bits only during its back off period if this

function is enabled. It makes IP178A have higher priority in a collision event.

IP178A uses the default value. User can’t change the setting.

141

MODBCK IPH/O Aggressive back off enable (MODBCK)

IP178A uses modified (aggressive) back off algorithm if this function is enabled.

The maximum back off period is limited to 8-slot time. It makes IP178A have

higher priority in a collision event.

1: aggressive mode enable (default),

0: standard back off

It is link LED of port 4 after reset if LED direct mode is selected.

138

ALLPASS IPL/O It is for testing only. This pin should be left open to turn off the function for normal

operation.

It is link LED of port 5 after reset if LED direct mode is selected.

Preliminary, Specification subject to change without notice 11

IP178A-DS-P05

Sep. 09, 2002

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