參數(shù)資料
型號(hào)： KSZ8995M
廠商： Micrel Inc
文件頁(yè)數(shù)： 37/73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(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）
包裝： 托盤(pán)
產(chǎn)品目錄頁(yè)面： 1081 (CN2011-ZH PDF)
配用： 576-1607-ND - BOARD EVAL EXPERIMENT KSZ8995MA
其它名稱(chēng)： 576-1038
KS8995M
Micrel
M9999-120403
42
December 2003
Address
Name
Description
Mode
Default
1
Legal Maximum Packet
1, will accept packet sizes up to 1536 bytes (inclusive).
R/W
Pin PMRXER
size check disable
0, 1522 bytes for tagged packets (not including packets
strap option.
with STPID from CPU to ports 1-4), 1518 bytes for
Pull-down (0):
untagged packets. Any packets larger than the specified
1518/1522 byte
value will be dropped.
packets. Pull-up
(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
802.1q VLAN enable
1, 802.1q VLAN mode is turned on. VLAN table needs
R/W
0
to set up before the operation.
0, 802.1q VLAN is disabled.
6
IGMP snoop enable on
1, IGMP snoop enabled. All the IGMP packets will be
R/W
0
Switch MII interface
forwarded to switch MII port.
0, IGMP snoop disabled.
5
Enable direct mode on
1, direct mode on port 5. This is a special mode for the
R/W
0
Switch MII interface
switch MII interface. Using preamble before MRXDV to
direct switch to forward packets, bypassing internal
look-up.
0, normal operation.
4
Enable pre tag on
1, packets forwarded to switch MII interface will be
R/W
0
Switch MII interface
pre-tagged with the source port number.
(preamble before MRXDV)
0, normal operation.
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.
1
Enable “tag” mask
1, the last 5 digits in the VID field are used as a mask
R/W
0
to determine which port(s) the packet should be
forwarded to.
0, no tag masks.
0
Sniff mode select
1, will do Rx AND Tx sniff (both source port and
R/W
0
destination port need to match).
0, will do Rx OR Tx sniff (Either source port or
destination port needs to match). This is the mode
used to implement Rx only sniff.
Register 6 (0x06): Global Control 4
7
Switch MII back
1, enable half-duplex back pressure on switch MII
R/W
0
pressure enable
interface.
0, disable back pressure on switch MII interface.
6
Switch MII half
1, enable MII interface half-duplex mode.
R/W
Pin SMRXD2 strap
duplex mode
0, enable MII interface full-duplex mode.
option. Pull-down
(0): Full duplex
mode. Pull-up
(1): Half duplex
mode
Note:
SMRXD2 has
internal pull down.
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