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KS8995MA Datasheet(PDF) 44 Page - Micrel Semiconductor

Part # KS8995MA
Description  Integrated 5-Port 10/100 Managed Switch
Download  79 Pages
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Manufacturer  MICREL [Micrel Semiconductor]
Direct Link  http://www.micrel.com
Logo MICREL - Micrel Semiconductor

KS8995MA Datasheet(HTML) 44 Page - Micrel Semiconductor

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Micrel, Inc.
KS8995MA/FQ
Semptember 2008
44
M9999-091508
Address
Name
Description
Mode
Default
5
IEEE 802.3x Transmit
Flow Control Disable
0, will enable transmit flow control based on AN result.
1, will not enable transmit flow control regardless of
AN result.
R/W
Pin PMRXD3
strap option.
Pull-down(0):
Enable Tx flow
control. Pull-up(1):
Disable Tx/Rx flow
control.
Note: PMRXD3
has internal pull-
down.
4
IEEE 802.3x Receive
Flow Control Disable
0, will enable receive flow control based on AN result.
1, will not enable receive flow control regardless of
AN result.
Note: Bit 5 and bit 4 default values are controlled by
the same pin, but they can be programmed
independently.
R/W
Pin PMRXD3
strap
option. Pull-down
(0): Enable Rx
flow
control. Pull-up
(1):
Disable Tx/Rx flow
control.
Note: PMRXD3
has internal pull-
down.
3
Frame Length Field Check
1, will check frame length field in the IEEE packets
If the actual length does not match, the packet will be
dropped (for L/T <1500) .
R/W
0
2
Aging Enable
1, Enable age function in the chip.
0, Disable aging function.
R/W
Pin LED[5][2]
strap option. Pull-
down (0): Aging
disable Pull-up
(1): Aging enable.
Note: LED[5][2]
has internal pull
up.
1
fast age Enable
1 = Turn on fast age (800µs).
R/W
0
0
Aggressive Back Off Enable
1 = Enable more aggressive back-off algorithm in half
duplex mode to enhance performance. This is not an
IEEE standard.
R/W
Pin PMRXD0
strap option. Pull-
down (0): Disable
aggressive back
off. Pull-up (1):
Aggressive back
off. Note:
PMRXD0 has
internal pull down.
Register 4 (0x04): Global Control 2
7
Unicast Port-VLAN
Mismatch Discard
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.
R/W
1
6
Multicast Storm Protection
Disable
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 packets.
R/W
1
5
Back Pressure Mode
1, carrier sense based backpressure is selected.
0, collision based backpressure is selected.
R/W
1


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