參數(shù)資料
型號(hào)： KSZ8995XA
廠商： Micrel Inc
文件頁(yè)數(shù)： 25/51頁(yè)
文件大小： 0K
描述： IC SWITCH 10/100 5PORT 128PQFP
標(biāo)準(zhǔn)包裝： 66
系列： *
類型： *
應(yīng)用： *
安裝類型： 表面貼裝
封裝/外殼： 128-BFQFP
供應(yīng)商設(shè)備封裝： 128-PQFP（14x20）
包裝： 托盤(pán)
產(chǎn)品目錄頁(yè)面： 1081 (CN2011-ZH PDF)
配用： 576-1642-ND - BOARD EVALUATION FOR KSZ8995XA
其它名稱： 576-1042
May 2005
31
M9999-051305
KS8995XA
Micrel, Inc.
Address
Name
Description
Mode
Default
Register 4 (0x04): Global Control 2
7
Reserved
R/W
1
6
Multicast storm
1 = “Broadcast Storm Protection” does not include
R/W
1
protection disable
multicast packets. Only DA=FFFFFFFFFFFF packets
will be regulated.
0 = “Broadcast Storm Protection” includes DA =
FFFFFFFFFFFF and DA[40] = 1 packets.
5
Reserved
R/W
1
4
Flow control and back
1 = fair mode is selected. In this mode, if a flow control
R/W
1
pressure fair mode
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.
3
No excessive collision
1 = the switch will not drop packets when 16 or more
R/W
Pin PMRXD1 strap
drop
collisions occur.
option. Pull-down (0):
0 = the switch will drop packets when 16 or more
Drop excessive
collisions occur.
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).
R/W
0
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
Legal maximum packet
1 = will accept packet sizes up to 1536 bytes (inclusive).
R/W
Pin PMRXER strap
size check disable
0 = 1522 bytes for tagged packets (not including.
option. Pull-down (0):
packets with STPID from CPU to ports 1-4), 1518 bytes
1518/1522 byte
for untagged packets. Any packets larger than the
packets. Pull-up
specified value will be dropped.
value will be
dropped. (1): 1536
byte packets
Note: PMRXER
has internal pull
down.
0
Priority buffer reserve
1 = each output queue is pre-allocated 48 buffers,
R/W
0
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.
Register 5 (0x05): Global Control 3
7
Reserved
R/W
0
6
Reserved
R/W
0
5
Reserved
R/W
0
4
Reserved
R/W
0
3-2
Priority scheme select
00 = always deliver high priority packets first.
R/W
00
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.
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