KSZ8873FLLI Micrel Inc, KSZ8873FLLI Datasheet - Page 51

• Manufacturer Part Number: KSZ8873FLLI
• Description: IC ETHERNET SWITCH 3PORT 64LQFP
• Manufacturer: Micrel Inc

Specifications of KSZ8873FLLI

• Controller Type: Ethernet Switch Controller
• Interface: MII
• Voltage - Supply: 1.8V, 2.5V, 3.3V
• Operating Temperature: -40°C ~ 85°C
• Mounting Type: Surface Mount
• Package / Case: 64-LQFP
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Current - Supply: -
• Lead Free Status / Rohs Status: Supplier Unconfirmed
• Other names: 576-3632; KSZ8873FLLI

Micrel, Inc.
Register 3 (0x03): Global Control 1
Register 4 (0x04): Global Control 2
September 2010
Bit
7
6
5
4
3
2
1
0
Bit
7
6
5
4
3
Frames
Port 3 Tail Tag
Mode Enable
IEEE 802.3x
Transmit
Direction Flow
Control Enable
IEEE 802.3x
Receive
Direction Flow
Control Enable
Frame Length
Field Check
Aging Enable
Fast Age
Enable
Aggressive
Back-off
Enable
Unicast
Port-VLAN
Mismatch
Discard
Multicast
Storm
Protection
Disable
Mode
Flow Control
and Back
Pressure Fair
Mode
No Excessive
Collision Drop
Name
Pass All
Name
Back Pressure
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R/W
Description
=1, Switch all packets including bad ones. Used solely for
debugging purposes. Works in conjunction with sniffer mode only.
=1, Enable port 3 tail tag mode.
=0, Disable.
=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.
=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.
=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).
=0, Not check
=1, Enable age function in the chip
=0, Disable age function in the chip
=1, Turn on fast age (800us)
=1, Enable more aggressive back off algorithm in half duplex mode
to enhance performance. This is not an IEEE standard.
Description
This feature is used with port-VLAN (described in reg. 17, reg. 33,
…)
=1, All packets can not cross VLAN boundary
=0, Unicast packets (excluding unkown/multicast/ broadcast) can
cross VLAN boundary
Note: Port mirroring is not supported if this bit is set to “0”.
=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
FF-FF-FF and DA[40] = 1 packets.
=1, Carrier sense based backpressure is selected
=0, Collision based backpressure is selected
=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.
=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.
51
DA = FF-FF-FF-
KSZ8873MLL/FLL/RLL
Default
0
0
1
1
1
0
0
0
Default
1
1
1
1
0
M9999-092309-1.2