KSZ8895 INFINEON [Infineon Technologies AG], KSZ8895 Datasheet - Page 59

• Manufacturer Part Number: KSZ8895
• Description: Integrated 5-Port 10/100 Managed Ethernet Switch with MII/RMII interface
• Manufacturer: INFINEON [Infineon Technologies AG]

Micrel, Inc.
January 2011
Address
3
2
1
0
Register 5 (0x05): Global Control 3
7
6
5
4
3-2
1
No Excessive
Collision Drop
Huge Packet Support
Legal Maximum Packet
Size Check Disable
Reserved
Name
802.1q VLAN Enable
IGMP Snoop Enable on
Switch SW5-MII/RMII
Interface
Enable Direct Mode on
Switch SW5-MII/RMII
Interface
Enable Pre-Tag on
Switch SW5-MII/TMI/RMIII
Interface
Reserved
Enable “Tag” Mask
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.
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.
Description
1, will accept packet sizes up to 1916 bytes (inclusive).
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.
N/A
1, 802.1q VLAN mode is turned on. VLAN table needs
to set up before the operation.
0, 802.1q VLAN is disabled.
1, IGMP snoop enabled. All the IGMP packets will be
forwarded to Switch MII/RMII port.
0, IGMP snoop disabled.
1, direct mode on Port 5. This is a special mode for the
Switch MII/RMII interface. Using preamble before
MRXDV to direct switch to forward packets, bypassing
internal look-up.
0, normal operation.
1, packets forwarded to Switch MII/RMII interface will
be
pre-tagged with the source port number (preamble
before MRXDV).
0, normal operation.
N/A
1, the last 5 digits in the VID field are used as a mask
to determine which port(s) the packet should be
forwarded to.
0, no tag masks.
Note: you need to turn off the 802.1q VLAN mode
(reg0x5, bit 7 = 0) for this bit to work.
59
Mode
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R/W
RO
RO
KSZ8895MQ/RQ/FMQ
Pin PMRXER
strap option.
PD(0): (default)
1518/1522 byte
packets.
PU(1): 1536 byte
packets.
Note: PMRXER
has internal pull-
down.
Pin PMRXD1
strap option.
PD(0): (default )
Drop excessive
collision packets.
PU(1): Don’t drop
excessive
collision packets.
Note: PMRXD1
has internal pull
down.
Default
M9999-012011-1.2
00
0
0
0
0
0
0
0
0
0