KS8893ML MICREL [Micrel Semiconductor], KS8893ML Datasheet - Page 56

• Manufacturer Part Number: KS8893ML
• Description: Integrated 3-Port 10/100 Managed Switch with PHYs Preliminary Data Sheet Rev. 1.0
• Manufacturer: MICREL [Micrel Semiconductor]

Register 3 (0x03): Global Control 1
Bit
7
6
5
4
3
2
1
0
Register 4 (0x04): Global Control 2
Bit
7
6
5
June 2005
Name
Pass All
Frames
Reserved
IEEE 802.3x
Transmit
Direction Flow
Control Enable
IEEE 802.3x
Receive
Direction Flow
Control Enable
Frame Length
Field Check
Fast Age
Enable
Aggressive
Back-off
Enable
Name
Unicast
Port-VLAN
Mismatch
Discard
Multicast
Storm
Protection
Disable
Mode
Aging Enable
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
Description
= 1, switch all packets including bad ones. Used
solely for debugging purposes. Works in conjunction
with sniffer mode only.
Reserved
Do not change the default value.
= 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).
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
DA = FF-FF-FF-FF-FF-FF and DA[40] = 1 packets.
= 1, carrier sense based backpressure is selected
= 0, collision based backpressure is selected
56
Default
0
0
1
1
0
1
0
0
Default
1
1
1
M9999-063005