KSZ9567R_V01 datasheet(91/233 Pages) MICROCHIP

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DS00002329E-page 91

KSZ9567R

5.1.4.24

Switch MAC Control 1 Register

Flow Control Packet Drop Mode

This bit controls which flow control packets may be forwarded or dropped. To

enable forwarding of all flow control packets, refer to bit 0 of the Switch MAC

Control 4 Register. Enabling of flow control is managed in the PHY Auto-

Negotiation Advertisement Register (for PHY ports) and the XMII Port

Control 0 Register (for MAC ports).

1 = The switch will drop received packets with either EtherType = 0x8808 or

destination address (DA) = 01-80-C2-00-00-01.

0 = The switch will drop received packets with both EtherType = 0x8808 and

DA = 01-80-C2-00-00-01.

R/W

Aggressive Back-off Enable

For use with half-duplex back pressure. This is not an IEEE standard.

1 = Enable aggressive back-off algorithm in half-duplex mode to enhance

performance.

0 = Disable

R/W

Address:

0x0331

Size:

8 bits

Bits

Description

Type

Default

RESERVED

R/W

Multicast Storm Protection Disable

1 = Multicast packets are not included in Broadcast Storm Protection

0 = Multicast packets are included in Broadcast Storm Protection

R/W

Back Pressure Mode

1 = Use carrier sense based back pressure mode

0 = Use collision based back pressure mode. (This is the recommended

mode.)

R/W

Flow Control and Back Pressure Fair Mode

1 = Enable fair mode. If a flow controlled ingress port and a non-flow

controlled ingress port forward traffic to the same egress port, packets from

the non-flow controlled port may be dropped.

0 = Disable fair mode. In this scenario the flow controlled port will be flow

controlled, and the non-flow controlled port will be neither flow controlled nor

packets dropped.

R/W

No Excessive Collision Drop

If this bit is set, Alternate Back-odd Mode (bit 7 in the Switch MAC Control 0

1 = The switch will not drop packets when 16 or more collisions occur.

0 = The switch will drop packets when 16 or more collisions occur

R/W

Bits

Description

Type

Default

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