參數(shù)資料
型號: KSZ8995FQ
廠商: Micrel Inc
文件頁數(shù): 44/89頁
文件大?。?/td> 0K
描述: IC SWITCH 10/100 5PORT 128-PQFP
標準包裝: 66
系列: *
產(chǎn)品目錄頁面: 1081 (CN2011-ZH PDF)
配用: 576-3872-ND - BOARD EVALUATION FOR KSZ8995FQ
其它名稱: 576-3077
Micrel, Inc.
KS8995MA/FQ
October 2011
49
M9999-102611-3.0
Global Registers (Continued)
Address
Name
Description
Mode
Default
1
Fast Age Enable
1 = Turn on fast age (800s).
R/W
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.
Address
Name
Description
Mode
Default
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
4
Flow Control and
Back Pressure Fair
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, 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.
R/W
1
3
No Excessive
Collision Drop
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.
R/W
Pin PMRXD1
strap option.
Pull-down (0):
Drop excessive
collision
packets. Pull-up
(1): Don’t drop
excessive
collision
packets. Note:
PMRXD1 has
internal pull-
down.
2
Huge Packet Support
1, will accept packet sizes up to 1916 bytes (inclusive). This bit setting
will override setting from bit 1 of the same register.
0, the max packet size will be determined by bit 1 of this register.
R/W
0
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