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參數(shù)資料
| 型號(hào)： | KSZ8993MLI |
| 廠商： | Micrel Inc |
| 文件頁(yè)數(shù)： | 47/86頁(yè) |
| 文件大?。?/td> | 0K |
| 描述： | IC SWITCH 10/100 3PORT 128-PQFP |
| 標(biāo)準(zhǔn)包裝： | 66 |
| 系列： | * |
| 產(chǎn)品目錄頁(yè)面： | 1081 (CN2011-ZH PDF) |
| 其它名稱： | 576-3350 |
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Micrel, Inc.
KSZ8993M/ML
October 2008
51
M9999-020606
Register 4 (0x04): Global Control 2 (continued)
Bit
Name
R/W
Description
Default
4
Flow control
and back
pressure fair
mode
R/W
= 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
3
No excessive
collision drop
R/W
= 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.
SMAC (pin
69) value
during
reset.
2
Huge packet
support
R/W
= 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.
0
1
Legal
Maximum
Packet size
check enable
R/W
= 0, will accept packet sizes up to 1536 bytes
(inclusive).
= 1, 1522 bytes for tagged packets, 1518 bytes for
untagged packets. Any packets larger than the
specified value will be dropped.
SMRXD0
(pin 85)
value
during
reset.
0
Priority Buffer
reserve
R/W
= 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.
1
Register 5 (0x05): Global Control 3
Bit
Name
R/W
Description
Default
7
802.1Q VLAN
enable
R/W
= 1, 802.1Q VLAN mode is turned on. VLAN table
needs to set up before the operation.
= 0, 802.1Q VLAN is disabled.
0
6
IGMP snoop
enable on
Switch MII
interface
R/W
=1, IGMP snoop is enabled.
All the IGMP packets will be forwarded to the Switch
MII port.
=0, IGMP snoop is disabled.
0
5
Reserved
R/W
0
4
Reserved
R/W
0
3-2
Priority
Scheme select
R/W
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
00
1
Reserved
R/W
0
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