KSZ8895 INFINEON [Infineon Technologies AG], KSZ8895 Datasheet - Page 58

• Manufacturer Part Number: KSZ8895
• Description: Integrated 5-Port 10/100 Managed Ethernet Switch with MII/RMII interface
• Manufacturer: INFINEON [Infineon Technologies AG]

Micrel, Inc.
January 2011
Address
2
1
0
Register 4 (0x04): Global Control 2
7
6
5
4
Flow Control and Back
Pressure fair Mode
Name
Aging Enable
Fast age Enable
Aggressive Back Off
Enable
Unicast Port-VLAN
Mismatch Discard
Multicast Storm Protection
Disable
Back Pressure Mode
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, then 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.
Description
1, Enable age function in the chip.
0, Disable aging function.
1 = Turn on fast age (800µs).
1 = Enable more aggressive back-off algorithm in half
duplex mode to enhance performance. This is not an
IEEE standard.
This feature is used for port VLAN (described in
Register 17, Register 33...).
1, all packets can not cross VLAN boundary.
0, unicast packets (excluding unknown/
multicast/broadcast) can cross VLAN boundary.
1, “Broadcast Storm Protection” does not include
multicast packets. Only DA=FFFFFFFFFFFF packets
will be regulated.
0, “Broadcast Storm Protection” includes
DA = FFFFFFFFFFFF and DA[40] = 1 packet.
1, carrier sense based backpressure is selected.
0, collision based backpressure is selected.
58
Mode
R/W
R/W
R/W
R/W
R/W
R/W
R/W
KSZ8895MQ/RQ/FMQ
Default
Pin LED[5][2]
strap option.
PD(0): Aging
disable.
PU(1): Aging
enable (default).
Note: LED[5][2]
has internal pull
up.
Pin PMRXD0
strap option.
PD(0): Disable
aggressive back
off (default).
PU(1):
Aggressive back
off.
Note: PMRXD0
has internal pull
down.
M9999-012011-1.2
1
1
0
0
1
1
1