KSZ9563R datasheet(133/226 Pages) MICROCHIP

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 2017-2018 Microchip Technology Inc.

DS00002419D-page 133

KSZ9563R

5.2.1.13

Port Operation Control 0 Register

Address:

0xN020

Port N: 1-3

Size:

8 bits

Bits

Description

Type

Default

Local MAC Loopback

Data going from the internal switch fabric to an egress port is looped back in

the MAC of that egress port and returned to the internal switch fabric.

1 = Local MAC loopback

0 = Normal operation

R/W

Remote MAC Loopback

Data received at the external pins of a port is looped back in the MAC of that

port and sent out the same port, without passing through the internal switch

fabric. For PHY ports, data is received on the RX+/- pins and transmitted out

the TX+/- pins. For xMII ports, data is received on the TXD pins and

transmitted on the RXD pins.

This loopback path does not include an RX-to-TX elastic buffer. Use small

packet sizes and only one or two packets at a time to avoid data corruption.

1 = Remote MAC loopback

0 = Normal operation

R/W

5:3

RESERVED

000b

Tail Tag Enable

When tail tagging is enabled for a port, it designates that port to be the “host”

or “CPU” port. Do not enable tail tagging for more than one port.

See the tail tagging description for details.

1 = Enable tail tagging on this port

0 = Disable tail tagging for this port

R/W

1:0

Egress Queue Split Enable

11 = Reserved

10 = Four egress queues. Packets are assigned to a queue based on

priority.

01 = Two egress queues. Packets are assigned to a queue based on priority.

00 = Single egress queue. There is no priority differentiation.

R/W

00b

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