參數(shù)資料
型號(hào)： KS8993F
廠商： Micrel Inc
文件頁(yè)數(shù)： 49/99頁(yè)
文件大小： 0K
描述： IC CONV MED 10/100 3PORT 128PQFP
標(biāo)準(zhǔn)包裝： 66
系列： *
類(lèi)型： *
應(yīng)用： *
安裝類(lèi)型： 表面貼裝
封裝/外殼： 128-BFQFP
供應(yīng)商設(shè)備封裝： 128-PQFP（14x20）
配用： KS8993F-EVAL-ND - EVAL KIT EXPERIMENTAL KS8993F
KS8993F
Micrel
August 26, 2004
Revision 1.0
- 53 -
Register 4 (0x04): Global Control 2
Bit
Name
R/W
Description
Default
7
Unicast
port-VLAN
mismatch
discard
R/W
This feature is used for port-VLAN and is described in reg. 17,
reg. 33, ...)
= 1, all packets can not cross VLAN boundary
= 0, unicast packets (excluding unkown/multicast/broadcast) can
cross VLAN boundary.
Note: Port mirroring is not supported if this bit is set to ‘0’.
1
6
Multicast
Storm
protection
Disable
R/W
= 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.
1
5
Back
pressure
mode
R/W
= 1, carrier sense based backpressure is selected
= 0, collision based backpressure is selected
1
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
Reserved
R/W
0
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