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參數(shù)資料
| 型號： | KSZ8995XA |
| 廠商： | MICREL INC |
| 元件分類： | 網(wǎng)絡(luò)接口 |
| 英文描述： | Integrated 5-Port 10/100 QoS Switch |
| 中文描述： | DATACOM, LAN SWITCHING CIRCUIT, PQFP128 |
| 封裝： | LEAD FREE, PLASTIC, QFP-128 |
| 文件頁數(shù)： | 31/51頁 |
| 文件大?。?/td> | 305K |
| 代理商： | KSZ8995XA |
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May 2005
31
M9999-051305
KS8995XA
Micrel, Inc.
Address
Register 4 (0x04): Global Control 2
7
6
protection disable
Name
Description
Mode
Default
Reserved
Multicast storm
Reserved
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.
Reserved
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.
R/W
R/W
1
1
5
4
Reserved
Flow control and back
pressure fair mode
R/W
R/W
1
1
3
No excessive collision
drop
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.
0
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.
1 = will accept packet sizes up to 1536 bytes (inclusive).
0 = 1522 bytes for tagged packets (not including.
packets with STPID from CPU to ports 1-4), 1518 bytes
for untagged packets. Any packets larger than the
specified value will be dropped.
R/W
1
Legal maximum packet
size check disable
R/W
Pin PMRXER strap
option. Pull-down (0):
1518/1522 byte
packets. Pull-up
value will be
dropped. (1): 1536
byte packets
Note: PMRXER
has internal pull
down.
0
0
Priority buffer reserve
1 = each output queue is pre-allocated 48 buffers,
used exclusively for high priority packets. It is
recommended to enable this when priority queue
feature is turned on.
0 = no reserved buffers for high priority packets.
R/W
Register 5 (0x05): Global Control 3
7
6
5
4
3-2
Reserved
Reserved
Reserved
Reserved
Priority scheme select
Reserved
Reserved
Reserved
Reserved
00 = always deliver high priority packets first.
01 = deliver high/low packets at ratio 10/1.
10 = deliver high/low packets at ratio 5/1.
11 = deliver high/low packets at ratio 2/1.
R/W
R/W
R/W
R/W
R/W
0
0
0
0
00
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