KS8993F-A1 Micrel Inc, KS8993F-A1 Datasheet - Page 53

• Manufacturer Part Number: KS8993F-A1
• Description: IC CONV MED 10/100 3PORT 128PQFP
• Manufacturer: Micrel Inc

Specifications of KS8993F-A1

• Applications: *
• Mounting Type: Surface Mount
• Package / Case: 128-MQFP, 128-PQFP
• For Use With: KS8993F-EVAL - EVAL KIT EXPERIMENTAL KS8993F
• Lead Free Status / RoHS Status: Contains lead / RoHS non-compliant

KS8993F
Register 4 (0x04): Global Control 2
Register 5 (0x05): Global Control 3
August 26, 2004
Bit
7
6
5
4
3
2
1
0
Bit
7
6
Name
Unicast
port-VLAN
mismatch
discard
Multicast
Storm
protection
Disable
Back
pressure
mode
Flow control
and back
pressure fair
mode
No excessive
collision drop
Huge packet
support
Legal
Maximum
Packet size
check enable
Priority Buffer
reserve
Name
802.1Q VLAN
enable
Reserved
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R/W
Description
This feature is used for port-VLAN and is described in reg. 17,
= 1, all packets can not cross VLAN boundary
= 0, unicast packets (excluding unkown/multicast/broadcast) can
Note: Port mirroring is not supported if this bit is set to ‘0’.
= 1, “Broadcast Storm Protection” does not include multicast
=
FFFFFFFFFFFF
= 1, carrier sense based backpressure is selected
= 0, collision based backpressure is selected
= 1, fair mode is selected. In this mode, if a flow control port and
= 0, in this mode, if a flow control port and a non-flow control port
= 1, the switch will not drop packets when 16 or more collisions
= 0, the switch will drop packets when 16 or more collisions
= 1, will accept packet sizes up to 1916 bytes (inclusive). This
register.
= 0, the max packet size will be determined by bit 1 of this
= 0, will accept packet sizes up to 1536 bytes (inclusive).
= 1, 1522 bytes for tagged packets, 1518 bytes for untagged
= 1, each output queue is pre-allocated 48 buffers, used
= 0, no reserved buffers for high priority packets.
Description
= 1, 802.1Q VLAN mode is turned on. VLAN table needs to set
= 0, 802.1Q VLAN is disabled.
reg. 33, ...)
0,
cross VLAN boundary.
occur.
occur.
bit setting will override setting from bit 1 of the same
register.
packets. Any packets larger than the specified value will be
dropped.
packets. Only DA = FFFFFFFFFFFF packets will be
regulated.
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.
talk to the same destination port, the flow control port
will be flow controlled. This may not be “fair” to the flow
control port.
exclusively for high priority packets. It is recommended to
enable this when priority queue feature is turned on.
up before the operation.
“Broadcast
- 53 -
Storm
and DA[40] = 1 packets.
Protection”
includes
DA
=
Default
1
1
1
1
SMAC
(pin 69)
value during
reset
0
SMRXD0
(pin 85)
value during
reset
1
Default
0
0
Revision 1.0
Micrel