KSZ8995MAI Micrel Inc, KSZ8995MAI Datasheet - Page 44

• Manufacturer Part Number: KSZ8995MAI
• Description: IC,Telecom Switching Circuit,CMOS,QFP,128PIN,PLASTIC
• Manufacturer: Micrel Inc

Specifications of KSZ8995MAI

• 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): Not RequiredV
• Fiber Support: Yes
• Integrated Led Drivers: Yes
• Data Rate: 100Mbps
• Phy/transceiver Interface: MII/SNI
• Power Supply Type: Analog/Digital
• Package Type: PQFP
• Data Rate (typ): 10/100Mbps
• Vlan Support: Yes
• Operating Temperature (max): 85C
• Operating Temperature (min): -40C
• Pin Count: 128
• Mounting: Surface Mount
• Jtag Support: No
• Operating Supply Voltage (max): Not RequiredV
• Operating Supply Voltage (min): Not RequiredV
• Operating Temperature Classification: Industrial
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• For Use With: 576-1607 - BOARD EVAL EXPERIMENT KSZ8995MA
• Lead Free Status / Rohs Status: Compliant
• Other names: 576-2126; KSZ8995MAI

Semptember 2008
Address
5
4
3
2
1
0
Register 4 (0x04): Global Control 2
7
6
5
Name
IEEE 802.3x Transmit
Flow Control Disable
IEEE 802.3x Receive
Flow Control Disable
Frame Length Field Check
Aging Enable
fast age Enable
Aggressive Back Off Enable
Unicast Port-VLAN
Mismatch Discard
Multicast Storm Protection
Disable
Back Pressure Mode
Description
0, will enable transmit flow control based on AN result.
1, will not enable transmit flow control regardless of
AN result.
0, will enable receive flow control based on AN result.
1, will not enable receive flow control regardless of
AN result.
Note: Bit 5 and bit 4 default values are controlled by
the same pin, but they can be programmed
independently.
1, will check frame length field in the IEEE packets
If the actual length does not match, the packet will be
dropped (for L/T <1500) .
1, Enable age function in the chip.
0, Disable aging function.
1 = Turn on fast age (800µs).
1 = Enable more aggressive back-off algorithm in half
duplex mode to enhance performance. This is not an
IEEE standard.
This feature is used for port VLAN (described in Register
17, Register 33...). 1, all packets can not cross VLAN
boundary. 0, unicast packets (excluding unknown/
multicast/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.
44
Mode
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R/W
Default
Pin PMRXD3
strap option.
Pull-down(0):
Enable Tx flow
control. Pull-up(1):
Disable Tx/Rx flow
control.
has internal pull-
down.
Pin PMRXD3
strap
option. Pull-down
(0): Enable Rx
flow
control. Pull-up
(1):
Disable Tx/Rx flow
control.
Note: PMRXD3
has internal pull-
down.
Pin LED[5][2]
strap option. Pull-
down (0): Aging
disable Pull-up
(1): Aging enable.
Note: LED[5][2]
has internal pull
up.
Pin PMRXD0
strap option. Pull-
down (0): Disable
aggressive back
off. Pull-up (1):
Aggressive back
off. Note:
PMRXD0 has
internal pull down.
M9999-091508
Note: PMRXD3
0
0
1
1
1