KSZ8995M Micrel Inc, KSZ8995M Datasheet - Page 41

• Manufacturer Part Number: KSZ8995M
• Description: IC SWITCH 10/100 5PORT 128PQFP
• Manufacturer: Micrel Inc

Specifications of KSZ8995M

• Applications: *
• Mounting Type: Surface Mount
• Package / Case: 128-MQFP, 128-PQFP
• Number Of Primary Switch Ports: 5
• Internal Memory Buffer Size: 64
• Operating Supply Voltage (typ): 1.8/2.5/3.3V
• Fiber Support: Yes
• Integrated Led Drivers: Yes
• Phy/transceiver Interface: MII/SNI
• Power Supply Type: Analog/Digital
• Package Type: PQFP
• Data Rate (typ): 10/100Mbps
• Vlan Support: Yes
• Operating Temperature (max): 70C
• Operating Temperature (min): 0C
• Pin Count: 128
• Mounting: Surface Mount
• Jtag Support: No
• Operating Supply Voltage (max): 1.9/2.6/3.6V
• Operating Supply Voltage (min): 1.7/2.4/3V
• Operating Temperature Classification: Commercial
• Data Rate: 100Mbps
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• For Use With: 576-1607 - BOARD EVAL EXPERIMENT KSZ8995MA
• Lead Free Status / RoHS Status: Compliant, Lead free / RoHS Compliant
• Other names: 576-1038

December 2003
KS8995M
Address
2
1
0
Register 4 (0x04): Global Control 2
7
6
5
4
3
2
Name
Aging enable
Fast age enable
Aggressive back
off enable
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
Description
1, Enable age function in the chip
0, Disable aging function
1, Turn on fast age (800 s)
1, Enable more aggressive backoff algorithm in half
duplex mode to enhance performance. This is not an
IEEE standard.
This feature is used for port-VLAN.
(described in reg17, reg33...)
1, all packets can not cross VLAN boundary.
0, unicast packets (excluding unknown/
mutlicast/broadcast) can cross VLAN boundary.
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, 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 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, the switch will not drop packets when 16 or more
collisions occur.
0, the switch will drop packets when 16 or more
collisions occur.
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.
41
Mode
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R/W
Default
Pin LED[5][2] strap
option. Pull-down
(0): Aging disable.
Pull-up (1): Aging
enable.
Note: LED[5][2]
has internal pull
up.
0
Pin PMRXD0 strap
option. Pull-down
(0): Disable
aggressive back
off. Pull-up (1):
Aggressive back
off.
Note: PMRXD0
has internal pull
down.
1
1
1
1
Pin PMRXD1 strap
option. Pull-down
(0): Drop
excessive collision
packets. Pull-up (1):
Don’t drop
excessive collision
packets.
Note: PMRXD1
has internal pull
down.
0
M9999-120403
Micrel