KSZ8893MQL datasheet(53/108 Pages) MICROCHIP

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 2019 Microchip Technology Inc.

DS00002897A-page 53

KSZ8893MQL/MBL

Pass All Frames

R/W

1 = Switch all packets, including bad ones. Used solely

for debugging purposes. Works in conjunction with

Sniffer mode only.

Reserved

R/W

Reserved. Do not change the default value.

IEEE 802.3x

Transmit Direction

Flow Control Enable

R/W

1 = Will enable transmit direction flow control feature

0 = Will not enable transmit direction flow control feature;

switch will not generate any flow control (PAUSE)

frame

IEEE 802.3x

Receive Direction

Flow Control Enable

R/W

1 = Will enable receive direction flow control feature

0 = Will not enable receive direction flow control feature;

switch will not react to any flow control (PAUSE)

frame it receives

Frame Length Field

Check

R/W

1 = Will check frame length field in the IEEE packets; if

the actual length does not match, the packet will be

dropped (for Length/Type field < 1500)

Aging Enable

R/W

1 = Enable age function in the chip

0 = Disable age function in the chip

Fast Age Enable

R/W

1 = Turn on fast age (800 µs)

Aggressive Back-Off

Enable

R/W

1 = Enable more aggressive back-off algorithm in Half-

Duplex mode to enhance performance; this is not

an IEEE standard

Unicast Port-VLAN

Mismatch Discard

R/W

This feature is used with port-VLAN (described in

Reg. 17, Reg. 33, etc.).

1 = All packets cannot cross VLAN boundary

0 = Unicast packets (excluding unknown/multicast/

broadcast) can cross VLAN boundary

Note:

Port mirroring is not supported if this bit is set to ‘0’.

Multicast Storm

Protection Disable

R/W

1 = “Broadcast Storm Protection” does not include

multicast packets; only DA = FF-FF-FF-FF-FF-FF

packets will be regulated

0 = “Broadcast Storm Protection” includes

DA = FF-FF-FF-FF-FF-FF and DA[40] = 1 packet

Backpressure Mode

R/W

1 = Carrier sense-based backpressure is selected

0 = Collision-based backpressure is selected

Flow Control and

Backpressure Fair

Mode

R/W

1 = Fair mode is selected. In this mode, if a flow control

port and a non-flow control port talk to the same

destination port, packets from the non-flow control

port may be dropped. This is to prevent the flow

control port from being flow controlled for an

extended period of time.

0 = In this mode, if a flow control port and a non-flow

control port talk to the same destination port, the

flow control port will be flow controlled. This may not

be “fair” to the flow control port.

No Excessive

Collision Drop

R/W

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

TABLE 4-6:

GLOBAL REGISTERS (CONTINUED)

Bit

Name

R/W

Description

Default

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